release 3.4.1

(see issue #824)

.github/workflows/ci.yml

@@ -9,6 +9,14 @@ on:
       - '*'
     tags:
       - '[0-9]*'
+    paths-ignore:
+      - '**.md'
+      - '.*'
+      - '**/.settings/**'
+      - 'flatlaf-core/svg/**'
+      - 'flatlaf-testing/dumps/**'
+      - 'flatlaf-testing/misc/**'
+      - 'images/**'
 
 jobs:
   build:
@@ -19,34 +27,39 @@ jobs:
         # test against
         # - Java 8 (minimum requirement)
         # - Java LTS versions (11, 17, ...)
-        # - lastest Java version(s)
+        # - latest Java version(s)
         java:
           - 8
           - 11  # LTS
           - 17  # LTS
+          - 21  # LTS
         toolchain: [""]
         include:
-          - java: 17
-            toolchain: 19  # latest
+          - java: 21
+            toolchain: 22  # latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - uses: gradle/wrapper-validation-action@v1
+      - uses: gradle/wrapper-validation-action@v2
         if: matrix.java == '8'
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java }}
-          distribution: adopt  # Java 8 and 11 are pre-installed on ubuntu-latest
+          distribution: temurin  # Java 8, 11, 17 and 21 are pre-installed on ubuntu-latest
           cache: gradle
 
+      - name: Check with Error Prone
+        if: matrix.java == '11'
+        run: ./gradlew errorprone clean -Dtoolchain=${{ matrix.toolchain }}
+
       - name: Build with Gradle
         run: ./gradlew build -Dtoolchain=${{ matrix.toolchain }}
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: matrix.java == '11'
         with:
           name: FlatLaf-build-artifacts
@@ -66,17 +79,17 @@ jobs:
       github.repository == 'JFormDesigner/FlatLaf'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Java 11
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: 11
-          distribution: adopt  # pre-installed on ubuntu-latest
+          distribution: temurin  # pre-installed on ubuntu-latest
           cache: gradle
 
       - name: Publish snapshot to oss.sonatype.org
-        run: ./gradlew publish :flatlaf-theme-editor:build -PskipFonts -Dorg.gradle.internal.publish.checksums.insecure=true
+        run: ./gradlew publish :flatlaf-theme-editor:build -PskipFonts -Dorg.gradle.internal.publish.checksums.insecure=true -Dorg.gradle.parallel=false
         env:
           OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
@@ -102,17 +115,17 @@ jobs:
       github.repository == 'JFormDesigner/FlatLaf'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Java 11
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: 11
-          distribution: adopt  # pre-installed on ubuntu-latest
+          distribution: temurin  # pre-installed on ubuntu-latest
           cache: gradle
 
       - name: Release a new stable version to Maven Central
-        run: ./gradlew publish :flatlaf-demo:build :flatlaf-theme-editor:build -PskipFonts -Prelease
+        run: ./gradlew publish :flatlaf-demo:build :flatlaf-theme-editor:build -PskipFonts -Prelease -Dorg.gradle.parallel=false
         env:
           OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}

.github/workflows/fonts.yml

@@ -13,6 +13,8 @@ on:
             - 'flatlaf-fonts/**'
             - '.github/workflows/fonts.yml'
             - 'gradle/wrapper/gradle-wrapper.properties'
+            - '!**.md'
+            - '!**/.settings/**'
 
 jobs:
     Fonts:
@@ -30,13 +32,13 @@ jobs:
             github.repository == 'JFormDesigner/FlatLaf'
 
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@v4
 
             - name: Setup Java 11
-              uses: actions/setup-java@v3
+              uses: actions/setup-java@v4
               with:
                   java-version: 11
-                  distribution: adopt  # pre-installed on ubuntu-latest
+                  distribution: temurin  # pre-installed on ubuntu-latest
                   cache: gradle
 
             - name: Build with Gradle

.github/workflows/natives.yml

@@ -13,6 +13,8 @@ on:
             - 'flatlaf-natives/**'
             - '.github/workflows/natives.yml'
             - 'gradle/wrapper/gradle-wrapper.properties'
+            - '!**.md'
+            - '!**/.settings/**'
 
 jobs:
     Natives:
@@ -20,20 +22,21 @@ jobs:
             matrix:
                 os:
                     - windows
+                    - macos
                     - ubuntu
 
         runs-on: ${{ matrix.os }}-latest
 
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@v4
 
-            - uses: gradle/wrapper-validation-action@v1
+            - uses: gradle/wrapper-validation-action@v2
 
             - name: Setup Java 11
-              uses: actions/setup-java@v3
+              uses: actions/setup-java@v4
               with:
                   java-version: 11
-                  distribution: adopt
+                  distribution: temurin
                   cache: gradle
 
             - name: Build with Gradle
@@ -42,7 +45,7 @@ jobs:
               run: ./gradlew build-natives --no-daemon
 
             - name: Upload artifacts
-              uses: actions/upload-artifact@v3
+              uses: actions/upload-artifact@v4
               with:
                   name: FlatLaf-natives-build-artifacts-${{ matrix.os }}
                   path: |

.github/workflows/pr-snapshots.yml

@@ -0,0 +1,37 @@
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+
+name: PR Snapshots
+
+on:
+  pull_request:
+    paths-ignore:
+      - '**.md'
+      - '.*'
+      - '**/.settings/**'
+      - 'flatlaf-core/svg/**'
+      - 'flatlaf-testing/dumps/**'
+      - 'flatlaf-testing/misc/**'
+      - 'images/**'
+
+jobs:
+  snapshot:
+    runs-on: ubuntu-latest
+    if: github.repository == 'JFormDesigner/FlatLaf'
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Java 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: 11
+          distribution: temurin  # pre-installed on ubuntu-latest
+          cache: gradle
+
+      - name: Publish PR snapshot to oss.sonatype.org
+        run: >
+          ./gradlew publish -PskipFonts -Dorg.gradle.internal.publish.checksums.insecure=true -Dorg.gradle.parallel=false
+          -Pgithub.event.pull_request.number=${{ github.event.pull_request.number }}
+        env:
+          OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}

CHANGELOG.md

@@ -1,12 +1,305 @@
 FlatLaf Change Log
 ==================
 
-## 3.1-SNAPSHOT
+## 3.4.1
+
+#### Fixed bugs
+
+- SplitPane: Update divider when client property `JSplitPane.expandableSide`
+  changed.
+- TabbedPane: Fixed swapped back and forward scroll buttons when using
+  `TabbedPane.scrollButtonsPlacement = trailing` (regression in FlatLaf 3.3).
+- Fixed missing window top border on Windows 10 in "full window content" mode.
+  (issue 809)
+- Extras:
+  - `FlatSVGIcon` color filters now support linear gradients. (PR #817)
+  - `FlatSVGIcon`: Use log level `CONFIG` instead of `SEVERE` and allow
+    disabling logging. (issue #823)
+  - Added support for `JSplitPane.expandableSide` client property to
+    `FlatSplitPane`.
+- Native libraries: Added API version check to test whether native library
+  matches the JAR (bad builds could e.g. ship a newer JAR with an older
+  incompatible native library) and to test whether native methods can be invoked
+  (some security software allows loading native library but blocks method
+  invocation).
+- macOS: Fixed crash when running in WebSwing. (issue #826; regression in 3.4)
+
+#### Incompatibilities
+
+- File names of custom properties files for nested Laf classes now must include
+  name of enclosing class name. E.g. nested Laf class `IntelliJTheme.ThemeLaf`
+  used `ThemeLaf.properties` in previous versions, but now needs to be named
+  `IntelliJTheme$ThemeLaf.properties`.
+
+
+## 3.4
 
 #### New features and improvements
 
-- Fonts: Added **Roboto
-  Mono** (https://fonts.google.com/specimen/Roboto+Mono). (PR #639, issue #638)
+- FlatLaf window decorations (Windows 10/11 and Linux): Support "full window
+  content" mode, which allows you to extend the content into the window title
+  bar. (PR #801)
+- macOS: Support larger window title bar close/minimize/zoom buttons spacing in
+  [full window content](https://www.formdev.com/flatlaf/macos/#full_window_content)
+  mode and introduced "buttons placeholder". (PR #779)
+- Native libraries:
+  - System property `flatlaf.nativeLibraryPath` now supports loading native
+    libraries named the same as on Maven central.
+  - Published `flatlaf-<version>-no-natives.jar` to Maven Central. This JAR is
+    equal to `flatlaf-<version>.jar`, except that it does not contain the
+    FlatLaf native libraries. The Maven "classifier" to use this JAR is
+    `no-natives`. You need to distribute the FlatLaf native libraries with your
+    application.
+    See https://www.formdev.com/flatlaf/native-libraries/ for more details.
+  - Improved log messages for loading fails.
+- Fonts: Updated **Inter** to
+  [v4.0](https://github.com/rsms/inter/releases/tag/v4.0).
+- Table: Select all text in cell editor when starting editing using `F2` key.
+  (issue 652)
+
+#### Fixed bugs
+
+- macOS: Setting window background (of undecorated window) to translucent color
+  (alpha < 255) did not show the window translucent. (issue #705)
+- JIDE CommandMenuBar: Fixed `ClassCastException` when JIDE command bar displays
+  `JideMenu` in popup. (PR #794)
+
+
+## 3.3
+
+#### New features and improvements
+
+- macOS (10.14+): Popups (`JPopupMenu`, `JComboBox`, `JToolTip`, etc.) now use
+  native macOS rounded borders. (PR #772; issue #715)
+- Native libraries: Added `libflatlaf-macos-arm64.dylib` and
+  `libflatlaf-macos-x86_64.dylib`. See also
+  https://www.formdev.com/flatlaf/native-libraries/.
+- ScrollPane: Support rounded border. (PR #713)
+- SplitPane: Support divider hover and pressed background colors. (PR #788)
+- TabbedPane: Support vertical tabs. (PR #758, issue #633)
+- TabbedPane: Paint rounded tab area background for rounded cards. (issue #717)
+- ToolBar: Added styling properties `separatorWidth` and `separatorColor`.
+
+#### Fixed bugs
+
+- Button and ToggleButton: Selected buttons did not use explicitly set
+  foreground color. (issue 756)
+- FileChooser: Catch NPE in Java 21 when getting icon for `.exe` files that use
+  default Windows exe icon. (see
+  [JDK-8320692](https://bugs.openjdk.org/browse/JDK-8320692))
+- OptionPane: Fixed styling custom panel background in `JOptionPane`. (issue
+  #761)
+- ScrollPane: Styling ScrollPane border properties did not work if view
+  component is a Table.
+- Table:
+  - Switching theme looses table grid and intercell spacing. (issues #733 and
+    #750)
+  - Fixed background of `boolean` columns when using alternating row colors.
+    (issue #780)
+  - Fixed border arc of components in complex table cell editors. (issue #786)
+- TableHeader:
+  - No longer temporary replace header cell renderer while painting. This avoids
+    a `StackOverflowError` in case that custom renderer does this too. (see
+    [NetBeans issue #6835](https://github.com/apache/netbeans/issues/6835)) This
+    also improves compatibility with custom table header implementations.
+  - Header cell renderer background/foreground colors were not restored after
+    hover if renderer uses `null` for background/foreground. (PR #790)
+- TabbedPane:
+  - Avoid unnecessary repainting whole tabbed pane content area when layouting
+    leading/trailing components.
+  - Avoid unnecessary repainting of selected tab on temporary changes.
+  - Fixed "endless" layouting and repainting when using nested tabbed panes (top
+    and bottom tab placement) and RSyntaxTextArea (with enabled line-wrapping)
+    as tab content. (see
+    [jadx issue #2030](https://github.com/skylot/jadx/issues/2030))
+- Fixed broken rendering after resizing window to minimum size and then
+  increasing size again. (issue #767)
+
+#### Incompatibilities
+
+- Removed support for JetBrains custom decorations, which required
+  [JetBrains Runtime](https://github.com/JetBrains/JetBrainsRuntime/wiki) (JBR)
+  8 or 11. It did not work for JBR 17. System property
+  `flatlaf.useJetBrainsCustomDecorations` is now ignored. **Note**: FlatLaf
+  window decorations continue to work with JBR.
+
+
+## 3.2.5
+
+#### Fixed bugs
+
+- Popup: Fixed NPE if popup invoker is `null` on Windows 10. (issue #753;
+  regression in 3.2.1 in fix for #626)
+
+
+## 3.2.4
+
+#### Fixed bugs
+
+- Popup: Fixed NPE if popup invoker is `null` on Linux with Wayland and Java 21.
+  (issue #752; regression in 3.2.3)
+
+
+## 3.2.3
+
+#### Fixed bugs
+
+- Popup: Popups that request focus were not shown on Linux with Wayland and Java 21.
+  (issue #752)
+
+
+## 3.2.2
+
+#### Fixed bugs
+
+- Button: Fixed painting icon and text at wrong location when using HTML text,
+  left/right vertical alignment and running in Java 19+. (issue #746)
+- CheckBox and RadioButton: Fixed cut off right side when border is removed and
+  horizontal alignment is set to `right`. (issue #734)
+- TabbedPane: Fixed NPE when using focusable component as tab component and
+  switching theme. (issue #745)
+
+
+## 3.2.1
+
+#### Fixed bugs
+
+- Fixed memory leak in
+  `MultiResolutionImageSupport.create(int,Dimension[],Function<Dimension,Image>)`,
+  which caches images created by the producer function. Used by
+  `FlatSVGIcon.getImage()` and `FlatSVGUtils.createWindowIconImages()`. If you
+  use one of these methods, it is **strongly recommended** to upgrade to this
+  version, because if the returned image is larger and painted very often it may
+  result in an out-of-memory situation. (issue #726)
+- FileChooser: Fixed occasional NPE in `FlatShortcutsPanel` on Windows. (issue
+  #718)
+- TextField: Fixed placeholder text painting, which did not respect horizontal
+  alignment property of `JTextField`. (issue #721)
+- Popup: Fixed drop shadow if popup overlaps a heavyweight component. (Windows
+  10 only; issue #626)
+
+
+## 3.2
+
+#### New features and improvements
+
+- TabbedPane: Support rounded underline selection and rounded card tabs. (PR
+  #703)
+- FlatLaf window decorations:
+  - Support for Windows on ARM 64-bit. (issue #443, PR #707)
+  - Support toolbox-style "small" window title bar. (issue #659, PR #702)
+- Extras: Class `FlatSVGIcon` now uses [JSVG](https://github.com/weisJ/jsvg)
+  library (instead of svgSalamander) for rendering. JSVG provides improved SVG
+  rendering and uses less memory compared to svgSalamander. (PR #684)
+- ComboBox: Improved location of selected item in popup if list is large and
+  scrollable.
+- FileChooser: Show localized text for all locales supported by Java's Metal
+  look and feel. (issue #680)
+- Added system property `flatlaf.useNativeLibrary` to allow disabling loading of
+  FlatLaf native library. (issue #674)
+- IntelliJ Themes:
+  - Reduced memory footprint by releasing Json data and ignoring IntelliJ UI
+    properties that are not used in FlatLaf.
+  - Updated "Hiberbee Dark" and "Gradianto" themes.
+
+#### Fixed bugs
+
+- Styling: Fixed scaling of some styling properties (`rowHeight` for Table and
+  Tree; `iconTextGap` for Button, CheckBox and RadioButton). (issue #682)
+- Fixed `IllegalComponentStateException` when invoker is not showing in
+  `SubMenuUsabilityHelper`. (issue #692)
+- macOS themes: Changing `@accentColor` variable in FlatLaf properties files did
+  not change all accent related colors for all components.
+- IntelliJ Themes:
+  - "Light Owl" theme: Fixed wrong (unreadable) text color in selected menu
+    items, selected text in text components, and selection in ComboBox popup
+    list. (issue #687)
+  - "Gradianto Midnight Blue" theme: Fixed color of ScrollBar track, which was
+    not visible. (issue #686)
+  - "Monocai" theme: Fixed unreadable text color of default buttons. (issue
+    #693)
+  - "Vuesion" theme: Fixed foreground colors of disabled text.
+  - "Material UI Lite" themes: Fixed non-editable ComboBox button background.
+  - CheckBox and RadioButton: Fixed unselected icon colors for themes "Atom One
+    Light", "Cyan Light", "GitHub", "Light Owl", "Material Lighter" and
+    "Solarized Light".
+  - TabbedPane: Fixed focused tab background color for themes "Arc *", "Material
+    Design Dark", "Monocai", "One Dark", "Spacegray" and "Xcode-Dark". (issue
+    #697)
+  - TextComponents, ComboBox and Spinner: Fixed background colors of enabled
+    text components, to distinguish from disabled, for themes "Carbon", "Cobalt
+    2", "Gradianto *", "Gruvbox *", "Monocai", "Spacegray", "Vuesion",
+    "Xcode-Dark", "GitHub", and "Light Owl". (issue #528)
+  - Fixed wrong disabled text colors in "Dark Flat", "Hiberbee Dark", "Light
+    Flat", "Nord", "Solarized Dark" and "Solarized Light" themes.
+  - Fixed colors for selection background/foreground, Separator, Slider track
+    and ProgressBar background in various themes.
+- Native Windows libraries: Fixed crash when running in Java 8 and newer Java
+  version is installed in `PATH` environment variable and using class
+  `SystemInfo` before AWT initialization. (issue #673)
+- ComboBox: Fixed search in item list for text with spaces. (issue #691)
+- FormattedTextField: On Linux, fixed `IllegalArgumentException: Invalid
+  location` if `JFormattedTextField.setDocument()` is invoked in a focus gained
+  listener on that formatted text field. (issue #698)
+- PopupMenu: Make sure that popup menu does not overlap any operating system
+  task bar. (issue #701)
+- FileChooser: Use system icons on Windows with Java 17.0.3 (and later) 32-bit.
+  Only Java 17 - 17.0.2 32-bit do not use system icons because of a bug in Java
+  32-bit that crashes the application. (PR #709)
+- FileChooser: Fixed crash on Windows with Java 17 to 17.0.2 32-bit. Java 17
+  64-bit is not affected. (regression since FlatLaf 2.3; PR #522, see also issue
+  #403)
+
+#### Incompatibilities
+
+- Extras: Class `FlatSVGIcon` now uses [JSVG](https://github.com/weisJ/jsvg)
+  library for SVG rendering. You need to replace svgSalamander with JSVG in your
+  build scripts and distribute `jsvg.jar` with your application. Also replace
+  `com.kitfox.svg` with `com.github.weisj.jsvg` in `module-info.java` files.
+- IntelliJ Themes: Removed all "Contrast" themes from "Material UI Lite".
+
+
+## 3.1.1
+
+- IntelliJ Themes:
+  - Fixed too large menu item paddings and too large table/tree row heights (all
+    "Material Theme UI Lite" themes; issue #667; regression in FlatLaf 3.1).
+  - Fixed too large tree row height in "Carbon", "Dark Purple", "Gray",
+    "Material Design Dark", "Monokai Pro", "One Dark" and "Spacegray" themes.
+- Native libraries: Fixed `IllegalArgumentException: URI scheme is not "file"`
+  when using FlatLaf in WebStart. (issue #668; regression in FlatLaf 3.1)
+
+
+## 3.1
+
+#### New features and improvements
+
+- Windows 11: Popups (`JPopupMenu`, `JComboBox`, `JToolTip`, etc.) now use
+  native Windows 11 rounded borders and drop shadows. (PR #643)
+- Fonts:
+  - Added **Roboto Mono** (https://fonts.google.com/specimen/Roboto+Mono). (PR
+    #639, issue #638)
+  - Updated **JetBrains Mono** to
+    [v2.304](https://github.com/JetBrains/JetBrainsMono/releases/tag/v2.304).
+- Theme Editor: Support macOS light and dark themes.
+- TabbedPane: Support hover and focused tab foreground colors. (issue #627)
+- TabbedPane: `tabbedPane.getBackgroundAt(tabIndex)` now has higher priority
+  than `TabbedPane.focusColor` and `TabbedPane.selectedBackground`. If
+  `tabbedPane.setBackgroundAt(tabIndex)` is used to set a color for a single
+  tab, then this color is now used even if the tab is focused or selected.
+- TableHeader: Support column hover and pressed background and foreground
+  colors. (issue #636)
+- Native libraries: Made it easier to distribute FlatLaf native libraries
+  (Windows `.dll` and Linux `.so`) to avoid problems on operating systems with
+  enabled execution restrictions.
+  See https://www.formdev.com/flatlaf/native-libraries/ for more details. (issue #624)
+  - Published native libraries to Maven Central for easy using them as
+    dependencies in Gradle and Maven.
+  - If available, native libraries are now loaded from same location as
+    `flatlaf.jar`, otherwise they are extract from `flatlaf.jar` to temporary
+    folder and loaded from there.
+  - Windows DLLs are now digitally signed with FormDev Software GmbH
+    certificate.
 
 #### Fixed bugs
 
@@ -15,11 +308,27 @@ FlatLaf Change Log
     decorations are used (e.g. Windows 10/11) or not (e.g. macOS). Now the glass
     pane no longer overlaps the FlatLaf window title bar. (issue #630)
   - Linux: Fixed broken window resizing on multi-screen setups. (issue #632)
+  - Linux: Fixed behavior of maximize/restore button when tiling window to left
+    or right half of screen. (issue #647)
 - IntelliJ Themes:
   - Fixed default button hover background in "Solarized Light" theme. (issue
     #628)
   - Avoid that accent color affect some colors in some IntelliJ themes. (issue
     #625)
+  - Updated "Hiberbee Dark" and "Material Theme UI Lite" themes.
+- Styling: Fixed resolving of UI variables in styles that use other variables.
+- MenuItem: Fixed horizontal alignment of icons. (issue #631)
+- Table: Fixed potential performance issue with paint cell focus indicator
+  border. (issue #654)
+- Tree: Fixed missing custom closed/opened/leaf icons of a custom
+  `DefaultTreeCellRenderer`. (issue #653; regression since implementing PR #609
+  in FlatLaf 3.0)
+- Tree: Fixed truncated node text and too small painted non-wide node background
+  if custom cell renderer sets icon, but not disabled icon, and tree is
+  disabled. (issue #640)
+- Fixed `HiDPIUtils.paintAtScale1x()`, which painted at wrong location if
+  graphics is rotated, is scaled and `x` or `y` parameters are not zero. (issue
+  #646)
 
 
 ## 3.0

README.md

@@ -6,7 +6,7 @@ Swing desktop applications.
 
 It looks almost flat (no shadows or gradients), clean, simple and elegant.
 FlatLaf comes with **Light**, **Dark**, **IntelliJ** and **Darcula** themes,
-scales on **HiDPI** displays and runs on Java 8 or newer.
+scales on **HiDPI** displays and runs on Java 8 or newer (LTS and latest).
 
 The look is heavily inspired by **Darcula** and **IntelliJ** themes from
 IntelliJ IDEA 2019.2+ and uses almost the same colors and icons.
@@ -62,10 +62,15 @@ build script:
     artifactId:  flatlaf
     version:     (see button below)
 
-Otherwise download `flatlaf-<version>.jar` here:
+Otherwise, download `flatlaf-<version>.jar` here:
 
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.formdev/flatlaf/badge.svg?style=flat-square&color=007ec6)](https://maven-badges.herokuapp.com/maven-central/com.formdev/flatlaf)
 
+See also
+[Native Libraries distribution](https://www.formdev.com/flatlaf/native-libraries/)
+for instructions on how to redistribute FlatLaf native libraries with your
+application.
+
 
 ### Snapshots
 
@@ -136,7 +141,7 @@ details and downloads.
 Buzz
 ----
 
-- [What others say about FlatLaf on Twitter](https://twitter.com/search?f=live&q=flatlaf)
+- [FlatLaf 3.1 (and 3.0) announcement on Reddit](https://www.reddit.com/r/java/comments/12xgrsu/flatlaf_31_and_30_swing_look_and_feel/)
 - [FlatLaf 1.0 announcement on Reddit](https://www.reddit.com/r/java/comments/lsbcwe/flatlaf_10_swing_look_and_feel/)
 - [FlatLaf announcement on Reddit](https://www.reddit.com/r/java/comments/dl0hu3/flatlaf_flat_look_and_feel/)
 
@@ -144,121 +149,196 @@ Buzz
 Applications using FlatLaf
 --------------------------
 
-- ![New](images/new.svg)
+### Featured
+
+- ![Sponsor](images/sponsor.svg) [JFormDesigner](https://www.formdev.com/)
+  (**commercial**) - Java/Swing GUI Designer (from the FlatLaf creators)
+- ![Sponsor](images/sponsor.svg)
   [JProfiler](https://www.ej-technologies.com/products/jprofiler/overview.html)
-  12 (**commercial**) - the award-winning all-in-one Java profiler
-- ![New](images/new.svg) [JFormDesigner](https://www.formdev.com/) 8
-  (**commercial**) - Java/Swing GUI Designer
-- ![New](images/new.svg) [Jeyla Studio](https://www.jeylastudio.com/) - Salon
-  Software
-- ![New](images/new.svg) [Fanurio](https://www.fanuriotimetracking.com/) 3.3.2
-  (**commercial**) - time tracking and billing for freelancers and teams
-- ![New](images/new.svg) [Antares](https://www.antarescircuit.io/) - a free,
-  powerful platform for designing, simulating and explaining digital circuits
-- ![New](images/new.svg)
-  [Logisim-evolution](https://github.com/logisim-evolution/logisim-evolution)
-  3.6 - Digital logic design tool and simulator
-- ![New](images/new.svg) [Cinecred](https://loadingbyte.com/cinecred/) - create
-  beautiful film credit sequences
-- ![New](images/new.svg) [tinyMediaManager](https://www.tinymediamanager.org/)
-  v4 (**commercial**) - a media management tool
-- ![New](images/new.svg) [Weasis](https://nroduit.github.io/) - medical DICOM
-  viewer used in healthcare by hospitals, health networks, etc
-- ![New](images/new.svg)
-  [Makelangelo Software](https://github.com/MarginallyClever/Makelangelo-software)
-  7.3.0 - for plotters, especially the wall-hanging polargraph
-- ![Hot](images/hot.svg) [Ultorg](https://www.ultorg.com/) (**commercial**) - a
-  visual query system for relational databases
-- [MooInfo](https://github.com/rememberber/MooInfo) - visual implementation of
-  OSHI, to view information about the system and hardware
-- [Jailer](https://github.com/Wisser/Jailer) 11.2 - database subsetting and
-  relational data browsing tool
-- ![Hot](images/hot.svg) [Apache NetBeans](https://netbeans.apache.org/) 11.3 -
-  IDE for Java, PHP, HTML and much more
-- [jclasslib bytecode viewer](https://github.com/ingokegel/jclasslib) 5.5
-- [KeyStore Explorer](https://keystore-explorer.org/) 5.4.3
-- ![Hot](images/hot.svg)
+  (**commercial**) - the award-winning all-in-one Java profiler
+- ![Sponsor](images/sponsor.svg)
   [install4j](https://www.ej-technologies.com/products/install4j/overview.html)
-  9.0 (**commercial**) - the powerful multi-platform Java installer builder
-- ![Hot](images/hot.svg) [DbVisualizer](https://www.dbvis.com/) 12.0
+  (**commercial**) - the powerful multi-platform Java installer builder
+- ![Sponsor](images/sponsor.svg) [DbVisualizer](https://www.dbvis.com/)
   (**commercial**) - the universal database tool for developers, analysts and
   DBAs
-- ![Hot](images/hot.svg) [MagicPlot](https://magicplot.com/) 3.0
-  (**commercial**) - Software for nonlinear fitting, plotting and data analysis
-- ![Hot](images/hot.svg)
-  [Thermo-Calc](https://thermocalc.com/products/thermo-calc/) 2021a
-  (**commercial**) - Thermodynamics and Properties Software
-- ![Hot](images/hot.svg) [OWASP ZAP](https://www.zaproxy.org/) 2.10 - the worlds
-  most widely used web app scanner
+- ![Hot](images/hot.svg) [Apache NetBeans](https://netbeans.apache.org/) - IDE
+  for Java, PHP, HTML and much more
+- ![Sponsor](images/sponsor.svg)
+  [Thermo-Calc](https://thermocalc.com/products/thermo-calc/) (**commercial**) -
+  Thermodynamics and Properties Software
+
+### Data
+
+- ![Hot](images/hot.svg) [Ultorg](https://www.ultorg.com/) (**commercial**) - a
+  visual query system for relational databases
+- [Jailer](https://github.com/Wisser/Jailer) - database subsetting and
+  relational data browsing tool
+- ![Hot](images/hot.svg) [MagicPlot](https://magicplot.com/) (**commercial**) -
+  Software for nonlinear fitting, plotting and data analysis
+- ![New](images/new.svg) [Constellation](https://www.constellation-app.com/) -
+  Data Visualization and Analytics (based on NetBeans platform)
+- ![New](images/new.svg)
+  [Kafka Visualizer](https://github.com/kumait/kafkavisualizer) - Kafka GUI
+  client
+
+### Security
+
+- ![Hot](images/hot.svg) [ZAP](https://www.zaproxy.org/) - the world's most
+  widely used web app scanner
 - ![Hot](images/hot.svg)
   [Burp Suite Professional and Community Edition](https://portswigger.net/burp/pro)
-  2020.11.2 (**commercial**) - the leading software for web security testing
+  (**commercial**) - the leading software for web security testing
+- ![New](images/new.svg)
+  [Ghidra](https://github.com/NationalSecurityAgency/ghidra) - a software
+  reverse engineering (SRE) framework
+- ![New](images/new.svg) [jadx](https://github.com/skylot/jadx) - Dex to Java
+  decompiler
 - [BurpCustomizer](https://github.com/CoreyD97/BurpCustomizer) - adds more
   FlatLaf themes to Burp Suite
+- [Total Validator](https://www.totalvalidator.com/) (**commercial**) - checks
+  your website
+- [JPass](https://github.com/gaborbata/jpass) - password manager with strong
+  encryption
+
+### Software Development
+
+- [jclasslib bytecode viewer](https://github.com/ingokegel/jclasslib)
+- [KeyStore Explorer](https://keystore-explorer.org/)
+- ![New](images/new.svg)
+  [muCommander](https://github.com/mucommander/mucommander) - lightweight
+  cross-platform file manager
+- ![New](images/new.svg) [Guiffy](https://www.guiffy.com/) (**commercial**) -
+  advanced cross-platform Diff/Merge
+- ![New](images/new.svg) [HashGarten](https://github.com/jonelo/HashGarten) -
+  cross-platform Swing GUI for Jacksum
+- [Pseudo Assembler IDE](https://github.com/tomasz-herman/PseudoAssemblerIDE) -
+  IDE for Pseudo-Assembler
+- [Linotte](https://github.com/cpc6128/LangageLinotte) - French programming
+  language created to learn programming
+- [lsfusion platform](https://github.com/lsfusion/platform) - information
+  systems development platform
+
+### Electrical
+
+- [Antares](https://www.antarescircuit.io/) - a free, powerful platform for
+  designing, simulating and explaining digital circuits
+- [Logisim-evolution](https://github.com/logisim-evolution/logisim-evolution) -
+  Digital logic design tool and simulator
+- [Makelangelo Software](https://github.com/MarginallyClever/Makelangelo-software) -
+  for plotters, especially the wall-hanging polargraph
+- [GUIslice Builder](https://github.com/ImpulseAdventure/GUIslice-Builder) - GUI
+  builder for [GUIslice](https://github.com/ImpulseAdventure/GUIslice), a
+  lightweight GUI framework for embedded displays
+- [ThunderFocus](https://github.com/marcocipriani01/ThunderFocus) -
+  Arduino-based telescope focuser
+- [RemoteLight](https://github.com/Drumber/RemoteLight) - multifunctional LED
+  control software
+
+### Media
+
+- ![Hot](images/hot.svg) [jAlbum](https://jalbum.net/) (**commercial**) -
+  creates photo album websites
+- ![New](images/new.svg) [MediathekView](https://mediathekview.de/) - search in
+  media libraries of various German broadcasters
+- [Cinecred](https://loadingbyte.com/cinecred/) - create beautiful film credit
+  sequences
+- [tinyMediaManager](https://www.tinymediamanager.org/) (**commercial**) - a
+  media management tool
+- [Weasis](https://nroduit.github.io/) - medical DICOM viewer used in healthcare
+  by hospitals, health networks, etc
+- [Shutter Encoder](https://www.shutterencoder.com/)
+  ([source code](https://github.com/paulpacifico/shutter-encoder)) -
+  professional video converter and compression tool
+- [Sound Analysis](https://github.com/tomasz-herman/SoundAnalysis) - analyze
+  sound files in time or frequency domain
+- [Novel-Grabber](https://github.com/Flameish/Novel-Grabber) - download novels
+  from any webnovel and lightnovel site
+- [lectureStudio](https://www.lecturestudio.org/) - digitize your lectures with
+  ease
+
+### Modelling
+
+- ![New](images/new.svg) [Astah](https://astah.net/) (**commercial**) - create
+  UML, ER Diagram, Flowchart, Data Flow Diagram, Requirement Diagram, SysML
+  diagrams and more
+- [IGMAS+](https://www.gfz-potsdam.de/igmas) - Interactive Gravity and Magnetic
+  Application System
+
+### Documents
+
+- ![New](images/new.svg) [Big Faceless (BFO) PDF Viewer](https://bfo.com/)
+  (**commercial**) - Swing PDF Viewer
+- [PDF Studio](https://www.qoppa.com/pdfstudio/) (**commercial**) - create,
+  review and edit PDF documents
+- [XMLmind XML Editor](https://www.xmlmind.com/xmleditor/) (**commercial**)
+
+### Geo
+
 - ![Hot](images/hot.svg) [JOSM](https://josm.openstreetmap.de/) - an extensible
   editor for [OpenStreetMap](https://www.openstreetmap.org/) (requires FlatLaf
   JOSM plugin)
-- ![Hot](images/hot.svg) [jAlbum](https://jalbum.net/) 21 (**commercial**) -
-  creates photo album websites
-- [PDF Studio](https://www.qoppa.com/pdfstudio/) 2021 (**commercial**) - create,
-  review and edit PDF documents
-- [XMLmind XML Editor](https://www.xmlmind.com/xmleditor/) 9.3 (**commercial**)
-- [Total Validator](https://www.totalvalidator.com/) 15 (**commercial**) -
-  checks your website
-- [j-lawyer](https://github.com/jlawyerorg/j-lawyer-org) - Kanzleisoftware
-- [MegaMek](https://github.com/MegaMek/megamek),
-  [MegaMekLab](https://github.com/MegaMek/megameklab) and
-  [MekHQ](https://github.com/MegaMek/mekhq) v0.47.5+ - a sci-fi tabletop
-  BattleTech simulator suite handling battles, unit building, and campaigns
-- [GUIslice Builder](https://github.com/ImpulseAdventure/GUIslice-Builder)
-  0.13.b024 - GUI builder for
-  [GUIslice](https://github.com/ImpulseAdventure/GUIslice), a lightweight GUI
-  framework for embedded displays
-- [Rest Suite](https://github.com/supanadit/restsuite) - Rest API testing
-- [ControllerBuddy](https://github.com/bwRavencl/ControllerBuddy) - advanced
-  gamepad mapping software
-- [SpringRemote](https://github.com/HaleyWang/SpringRemote) - remote Linux SSH
-  connections manager
-- [jEnTunnel](https://github.com/ggrandes/jentunnel) - manage SSH Tunnels made
-  easy
+- [Mapton](https://mapton.org/)
+  ([source code](https://github.com/trixon/mapton)) - some kind of map
+  application (based on NetBeans platform)
+- [MeteoInfo](https://github.com/meteoinfo/MeteoInfo) - GIS and scientific
+  computation environment for meteorological community
+
+### Business / Legal
+
+- ![Sponsor](images/sponsor.svg)
+  [j-lawyer](https://github.com/jlawyerorg/j-lawyer-org) - Kanzleisoftware
+- ![Sponsor](images/sponsor.svg) [Jeyla Studio](https://www.jeylastudio.com/) -
+  Salon Software
+- [Fanurio](https://www.fanuriotimetracking.com/) (**commercial**) - time
+  tracking and billing for freelancers and teams
+- [Jes](https://www.jes-eur.de) - Die Java-EÜR
 - [mendelson AS2](https://sourceforge.net/projects/mec-as2/),
   [AS4](https://sourceforge.net/projects/mendelson-as4/) and
   [OFTP2](https://sourceforge.net/projects/mendelson-oftp2/) (open-source) and
   [mendelson AS2](https://mendelson-e-c.com/as2/),
   [AS4](https://mendelson-e-c.com/as4/) and
   [OFTP2](https://mendelson-e-c.com/oftp2) (**commercial**)
-- [IGMAS+](https://www.gfz-potsdam.de/igmas) - Interactive Gravity and Magnetic
-  Application System
-- [MeteoInfo](https://github.com/meteoinfo/MeteoInfo) 2.2 - GIS and scientific
-  computation environment for meteorological community
-- [lsfusion platform](https://github.com/lsfusion/platform) 4 - information
-  systems development platform
-- [JPass](https://github.com/gaborbata/jpass) - password manager with strong
-  encryption
-- [Jes - Die Java-EÜR](https://www.jes-eur.de)
-- [Mapton](https://mapton.org/) 2.0
-  ([source code](https://github.com/trixon/mapton)) - some kind of map
-  application (based on NetBeans platform)
-- [Pseudo Assembler IDE](https://github.com/tomasz-herman/PseudoAssemblerIDE) -
-  IDE for Pseudo-Assembler
-- [Linotte](https://github.com/cpc6128/LangageLinotte) 3.1 - French programming
-  language created to learn programming
-- [MEKA](https://github.com/Waikato/meka) 1.9.3 - multi-label classifiers and
-  evaluation procedures using the Weka machine learning framework
-- [Shutter Encoder](https://www.shutterencoder.com/) 14.2
-  ([source code](https://github.com/paulpacifico/shutter-encoder)) -
-  professional video converter and compression tool (screenshots show **old**
-  look)
-- [Sound Analysis](https://github.com/tomasz-herman/SoundAnalysis) - analyze
-  sound files in time or frequency domain
-- [RemoteLight](https://github.com/Drumber/RemoteLight) - multifunctional LED
-  control software
-- [ThunderFocus](https://github.com/marcocipriani01/ThunderFocus) -
-  Arduino-based telescope focuser
-- [Novel-Grabber](https://github.com/Flameish/Novel-Grabber) - download novels
-  from any webnovel and lightnovel site
-- [lectureStudio](https://www.lecturestudio.org/) 4.3.1060 - digitize your
-  lectures with ease
+
+### Messaging
+
+- ![New](images/new.svg) [Spark](https://github.com/igniterealtime/Spark) -
+  cross-platform IM client optimized for businesses and organizations
+- ![New](images/new.svg) [Chatty](https://github.com/chatty/chatty) - Twitch
+  Chat Client
+
+### Gaming
+
+- ![New](images/new.svg) ![Sponsor](images/sponsor.svg)
+  [BGBlitz](https://www.bgblitz.com/) (**commercial**) - professional Backgammon
+- ![New](images/new.svg) [MCreator](https://github.com/MCreator/MCreator) - 
+  software used to make Minecraft Java Edition mods, Minecraft Bedrock Edition Add-Ons, 
+  and data packs without programming knowledge
+- ![New](images/new.svg) [MapTool](https://github.com/RPTools/maptool) - virtual
+  Tabletop for playing role-playing games
+- [MegaMek](https://github.com/MegaMek/megamek),
+  [MegaMekLab](https://github.com/MegaMek/megameklab) and
+  [MekHQ](https://github.com/MegaMek/mekhq) - a sci-fi tabletop BattleTech
+  simulator suite handling battles, unit building, and campaigns
+- [ControllerBuddy](https://github.com/bwRavencl/ControllerBuddy) - advanced
+  gamepad mapping software
+
+### Utilities
+
+- [MooInfo](https://github.com/rememberber/MooInfo) - visual implementation of
+  OSHI, to view information about the system and hardware
+- ![New](images/new.svg)
+  [Linux Task Manager (LTM)](https://github.com/ajee10x/LTM-LinuxTaskManager) -
+  GUI for monitoring and managing various aspects of a Linux system
+- [Rest Suite](https://github.com/supanadit/restsuite) - Rest API testing
+- [SpringRemote](https://github.com/HaleyWang/SpringRemote) - remote Linux SSH
+  connections manager
+- [jEnTunnel](https://github.com/ggrandes/jentunnel) - manage SSH Tunnels made
+  easy
 - [Android Tool](https://github.com/fast-geek/Android-Tool) - makes popular adb
   and fastboot commands easier to use
-- and more...
+
+### Miscellaneous
+
+- [MEKA](https://github.com/Waikato/meka) - multi-label classifiers and
+  evaluation procedures using the Weka machine learning framework

build.gradle.kts

@@ -14,10 +14,15 @@
  * limitations under the License.
  */
 
-val releaseVersion = "3.0"
-val developmentVersion = "3.1-SNAPSHOT"
+import net.ltgt.gradle.errorprone.errorprone
+
+version = property( if( hasProperty( "release" ) ) "flatlaf.releaseVersion" else "flatlaf.developmentVersion" ) as String
+
+// for PR snapshots change version to 'PR-<pr_number>-SNAPSHOT'
+val pullRequestNumber = findProperty( "github.event.pull_request.number" )
+if( pullRequestNumber != null )
+	version = "PR-${pullRequestNumber}-SNAPSHOT"
 
-version = if( rootProject.hasProperty( "release" ) ) releaseVersion else developmentVersion
 
 allprojects {
 	version = rootProject.version
@@ -43,6 +48,10 @@ if( !toolchainJavaVersion.isNullOrEmpty() )
 println()
 
 
+plugins {
+	alias( libs.plugins.errorprone ) apply false
+}
+
 allprojects {
 	tasks {
 		withType<JavaCompile>().configureEach {
@@ -81,4 +90,56 @@ allprojects {
 			isFailOnError = false
 		}
 	}
+
+
+	//---- Error Prone ----
+
+	tasks.register( "errorprone" ) {
+		group = "verification"
+		tasks.withType<JavaCompile>().forEach {
+			dependsOn( it )
+		}
+	}
+
+	val useErrorProne = gradle.startParameter.taskNames.contains( "errorprone" )
+	if( useErrorProne ) {
+		plugins.withType<JavaPlugin> {
+			apply( plugin = libs.plugins.errorprone.get().pluginId )
+
+			dependencies {
+				"errorprone"( libs.errorprone )
+			}
+
+			tasks.withType<JavaCompile>().configureEach {
+				options.compilerArgs.add( "-Werror" )
+				options.errorprone {
+					disable(
+						"ReferenceEquality",	// reports usage of '==' for objects
+						"StringSplitter",		// reports String.split()
+						"JavaTimeDefaultTimeZone",	// reports Year.now()
+						"MissingSummary",		// reports `/** @since 2 */`
+						"InvalidBlockTag",		// reports @uiDefault in javadoc
+						"AlreadyChecked",		// reports false positives
+						"InlineMeSuggester",	// suggests using Error Prone annotations for deprecated methods
+						"TypeParameterUnusedInFormals",
+						"UnsynchronizedOverridesSynchronized",
+						"NonApiType",			// reports ArrayList/HashSet in parameter or return type
+					)
+					when( project.name ) {
+						"flatlaf-intellij-themes" -> disable(
+							"MutablePublicArray",	// reports FlatAllIJThemes.INFOS
+						)
+						"flatlaf-theme-editor" -> disable(
+							"CatchAndPrintStackTrace",
+						)
+						"flatlaf-testing" -> disable(
+							"CatchAndPrintStackTrace",
+							"JdkObsolete",			// reports Hashtable used for JSlider.setLabelTable()
+							"JavaUtilDate",			// reports usage of class Date
+						)
+					}
+				}
+			}
+		}
+	}
 }

buildSrc/src/main/java/ReorderJarEntries.java

@@ -45,7 +45,7 @@ public class ReorderJarEntries
 			// 1st pass: copy .properties files
 			copyFiles( zipOutStream, jarFile, name -> name.endsWith( ".properties" ) );
 
-			// 2st pass: copy other files
+			// 2nd pass: copy other files
 			copyFiles( zipOutStream, jarFile, name -> !name.endsWith( ".properties" ) );
 		}
 

buildSrc/src/main/kotlin/flatlaf-cpp-library.gradle.kts

@@ -27,7 +27,7 @@ library {
 		}
 		with( linkTask.get() ) {
 			if( name.contains( "Release" ) )
-				debuggable.set( false )
+				debuggable = false
 		}
 	}
 }

buildSrc/src/main/kotlin/flatlaf-jni-headers.gradle.kts

@@ -26,7 +26,7 @@ tasks {
 		// depend on :flatlaf-core:compileJava because it generates the JNI headers
 		dependsOn( ":flatlaf-core:compileJava" )
 
-		from( project( ":flatlaf-core" ).buildDir.resolve( "generated/jni-headers" ) )
+		from( project( ":flatlaf-core" ).layout.buildDirectory.dir( "generated/jni-headers" ) )
 		into( "src/main/headers" )
 		include( extension.headers )
 		filter<org.apache.tools.ant.filters.FixCrLfFilter>(

buildSrc/src/main/kotlin/flatlaf-publish.gradle.kts

@@ -15,10 +15,13 @@
  */
 
 
+open class NativeArtifact( val fileName: String, val classifier: String, val type: String ) {}
+
 open class PublishExtension {
 	var artifactId: String? = null
 	var name: String? = null
 	var description: String? = null
+	var nativeArtifacts: List<NativeArtifact>? = null
 }
 
 val extension = project.extensions.create<PublishExtension>( "flatlafPublish" )
@@ -41,34 +44,43 @@ publishing {
 
 			pom {
 				afterEvaluate {
-					this@pom.name.set( extension.name )
-					this@pom.description.set( extension.description )
+					this@pom.name = extension.name
+					this@pom.description = extension.description
 				}
-				url.set( "https://github.com/JFormDesigner/FlatLaf" )
+				url = "https://github.com/JFormDesigner/FlatLaf"
 
 				licenses {
 					license {
-						name.set( "The Apache License, Version 2.0" )
-						url.set( "https://www.apache.org/licenses/LICENSE-2.0.txt" )
+						name = "The Apache License, Version 2.0"
+						url = "https://www.apache.org/licenses/LICENSE-2.0.txt"
 					}
 				}
 
 				developers {
 					developer {
-						name.set( "Karl Tauber" )
-						organization.set( "FormDev Software GmbH" )
-						organizationUrl.set( "https://www.formdev.com/" )
+						name = "Karl Tauber"
+						organization = "FormDev Software GmbH"
+						organizationUrl = "https://www.formdev.com/"
 					}
 				}
 
 				scm {
-					connection.set( "scm:git:git://github.com/JFormDesigner/FlatLaf.git" )
-					url.set( "https://github.com/JFormDesigner/FlatLaf" )
+					connection = "scm:git:git://github.com/JFormDesigner/FlatLaf.git"
+					url = "https://github.com/JFormDesigner/FlatLaf"
 				}
 
 				issueManagement {
-					system.set( "GitHub" )
-					url.set( "https://github.com/JFormDesigner/FlatLaf/issues" )
+					system = "GitHub"
+					url = "https://github.com/JFormDesigner/FlatLaf/issues"
+				}
+			}
+
+			afterEvaluate {
+				extension.nativeArtifacts?.forEach {
+					artifact( artifacts.add( "archives", file( it.fileName ) ) {
+						classifier = it.classifier
+						type = it.type
+					} )
 				}
 			}
 		}
@@ -110,3 +122,11 @@ signing {
 tasks.withType<Sign>().configureEach {
 	onlyIf { rootProject.hasProperty( "release" ) }
 }
+
+// check whether parallel build is enabled
+tasks.withType<AbstractPublishToMaven>().configureEach {
+	doFirst {
+		if( System.getProperty( "org.gradle.parallel" ) == "true" )
+			throw RuntimeException( "Publishing does not work correctly with enabled parallel build. Disable parallel build with VM option '-Dorg.gradle.parallel=false'." )
+	}
+}

buildSrc/src/main/kotlin/flatlaf-toolchain.gradle.kts

@@ -21,6 +21,6 @@ plugins {
 val toolchainJavaVersion = System.getProperty( "toolchain" )
 if( !toolchainJavaVersion.isNullOrEmpty() ) {
 	java.toolchain {
-		languageVersion.set( JavaLanguageVersion.of( toolchainJavaVersion ) )
+		languageVersion = JavaLanguageVersion.of( toolchainJavaVersion )
 	}
 }

flatlaf-core/.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=ISO-8859-1

flatlaf-core/build.gradle.kts

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import Flatlaf_publish_gradle.NativeArtifact
+
 plugins {
 	`java-library`
 	`flatlaf-toolchain`
@@ -25,12 +27,11 @@ plugins {
 val sigtest = configurations.create( "sigtest" )
 
 dependencies {
-	testImplementation( "org.junit.jupiter:junit-jupiter-api:5.7.2" )
-	testImplementation( "org.junit.jupiter:junit-jupiter-params" )
-	testRuntimeOnly( "org.junit.jupiter:junit-jupiter-engine" )
+	testImplementation( libs.junit )
+	testRuntimeOnly( libs.junit.launcher )
 
 	// https://github.com/jtulach/netbeans-apitest
-	sigtest( "org.netbeans.tools:sigtest-maven-plugin:1.7" )
+	sigtest( libs.sigtest )
 }
 
 java {
@@ -41,11 +42,11 @@ java {
 tasks {
 	compileJava {
 		// generate JNI headers
-		options.headerOutputDirectory.set( buildDir.resolve( "generated/jni-headers" ) )
+		options.headerOutputDirectory = layout.buildDirectory.dir( "generated/jni-headers" )
 	}
 
 	jar {
-		archiveBaseName.set( "flatlaf" )
+		archiveBaseName = "flatlaf"
 
 		doLast {
 			ReorderJarEntries.reorderJarEntries( outputs.files.singleFile );
@@ -53,11 +54,32 @@ tasks {
 	}
 
 	named<Jar>( "sourcesJar" ) {
-		archiveBaseName.set( "flatlaf" )
+		archiveBaseName = "flatlaf"
 	}
 
 	named<Jar>( "javadocJar" ) {
-		archiveBaseName.set( "flatlaf" )
+		archiveBaseName = "flatlaf"
+	}
+
+	register<Zip>( "jarNoNatives" ) {
+		group = "build"
+		dependsOn( "jar" )
+
+		archiveBaseName = "flatlaf"
+		archiveClassifier = "no-natives"
+		archiveExtension = "jar"
+		destinationDirectory = layout.buildDirectory.dir( "libs" )
+
+		from( zipTree( jar.get().archiveFile.get().asFile ) )
+		exclude( "com/formdev/flatlaf/natives/**" )
+	}
+
+	withType<AbstractPublishToMaven>().configureEach {
+		dependsOn( "jarNoNatives" )
+	}
+
+	withType<Sign>().configureEach {
+		dependsOn( "jarNoNatives" )
 	}
 
 	check {
@@ -123,4 +145,16 @@ flatlafPublish {
 	artifactId = "flatlaf"
 	name = "FlatLaf"
 	description = "Flat Look and Feel"
+
+	val natives = "src/main/resources/com/formdev/flatlaf/natives"
+	nativeArtifacts = listOf(
+		NativeArtifact( tasks.getByName( "jarNoNatives" ).outputs.files.asPath, "no-natives", "jar" ),
+
+		NativeArtifact( "${natives}/flatlaf-windows-x86.dll",       "windows-x86",    "dll" ),
+		NativeArtifact( "${natives}/flatlaf-windows-x86_64.dll",    "windows-x86_64", "dll" ),
+		NativeArtifact( "${natives}/flatlaf-windows-arm64.dll",     "windows-arm64",  "dll" ),
+		NativeArtifact( "${natives}/libflatlaf-macos-arm64.dylib",  "macos-arm64",    "dylib" ),
+		NativeArtifact( "${natives}/libflatlaf-macos-x86_64.dylib", "macos-x86_64",   "dylib" ),
+		NativeArtifact( "${natives}/libflatlaf-linux-x86_64.so",    "linux-x86_64",   "so" ),
+	)
 }

flatlaf-core/flatlaf-core-sigtest.txt

@@ -1,5 +1,5 @@
 #Signature file v4.1
-#Version 3.0
+#Version 3.4
 
 CLSS public abstract interface com.formdev.flatlaf.FlatClientProperties
 fld public final static java.lang.String BUTTON_TYPE = "JButton.buttonType"
@@ -12,6 +12,13 @@ fld public final static java.lang.String BUTTON_TYPE_TOOLBAR_BUTTON = "toolBarBu
 fld public final static java.lang.String COMPONENT_FOCUS_OWNER = "JComponent.focusOwner"
 fld public final static java.lang.String COMPONENT_ROUND_RECT = "JComponent.roundRect"
 fld public final static java.lang.String COMPONENT_TITLE_BAR_CAPTION = "JComponent.titleBarCaption"
+fld public final static java.lang.String FULL_WINDOW_CONTENT = "FlatLaf.fullWindowContent"
+fld public final static java.lang.String FULL_WINDOW_CONTENT_BUTTONS_BOUNDS = "FlatLaf.fullWindowContent.buttonsBounds"
+fld public final static java.lang.String FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER = "FlatLaf.fullWindowContent.buttonsPlaceholder"
+fld public final static java.lang.String GLASS_PANE_FULL_HEIGHT = "JRootPane.glassPaneFullHeight"
+fld public final static java.lang.String MACOS_WINDOW_BUTTONS_SPACING = "FlatLaf.macOS.windowButtonsSpacing"
+fld public final static java.lang.String MACOS_WINDOW_BUTTONS_SPACING_LARGE = "large"
+fld public final static java.lang.String MACOS_WINDOW_BUTTONS_SPACING_MEDIUM = "medium"
 fld public final static java.lang.String MENU_BAR_EMBEDDED = "JRootPane.menuBarEmbedded"
 fld public final static java.lang.String MINIMUM_HEIGHT = "JComponent.minimumHeight"
 fld public final static java.lang.String MINIMUM_WIDTH = "JComponent.minimumWidth"
@@ -19,8 +26,10 @@ fld public final static java.lang.String OUTLINE = "JComponent.outline"
 fld public final static java.lang.String OUTLINE_ERROR = "error"
 fld public final static java.lang.String OUTLINE_WARNING = "warning"
 fld public final static java.lang.String PLACEHOLDER_TEXT = "JTextField.placeholderText"
+fld public final static java.lang.String POPUP_BORDER_CORNER_RADIUS = "Popup.borderCornerRadius"
 fld public final static java.lang.String POPUP_DROP_SHADOW_PAINTED = "Popup.dropShadowPainted"
 fld public final static java.lang.String POPUP_FORCE_HEAVY_WEIGHT = "Popup.forceHeavyWeight"
+fld public final static java.lang.String POPUP_ROUNDED_BORDER_WIDTH = "Popup.roundedBorderWidth"
 fld public final static java.lang.String PROGRESS_BAR_LARGE_HEIGHT = "JProgressBar.largeHeight"
 fld public final static java.lang.String PROGRESS_BAR_SQUARE = "JProgressBar.square"
 fld public final static java.lang.String SCROLL_BAR_SHOW_BUTTONS = "JScrollBar.showButtons"
@@ -65,6 +74,11 @@ fld public final static java.lang.String TABBED_PANE_TAB_CLOSE_TOOLTIPTEXT = "JT
 fld public final static java.lang.String TABBED_PANE_TAB_HEIGHT = "JTabbedPane.tabHeight"
 fld public final static java.lang.String TABBED_PANE_TAB_ICON_PLACEMENT = "JTabbedPane.tabIconPlacement"
 fld public final static java.lang.String TABBED_PANE_TAB_INSETS = "JTabbedPane.tabInsets"
+fld public final static java.lang.String TABBED_PANE_TAB_ROTATION = "JTabbedPane.tabRotation"
+fld public final static java.lang.String TABBED_PANE_TAB_ROTATION_AUTO = "auto"
+fld public final static java.lang.String TABBED_PANE_TAB_ROTATION_LEFT = "left"
+fld public final static java.lang.String TABBED_PANE_TAB_ROTATION_NONE = "none"
+fld public final static java.lang.String TABBED_PANE_TAB_ROTATION_RIGHT = "right"
 fld public final static java.lang.String TABBED_PANE_TAB_TYPE = "JTabbedPane.tabType"
 fld public final static java.lang.String TABBED_PANE_TAB_TYPE_CARD = "card"
 fld public final static java.lang.String TABBED_PANE_TAB_TYPE_UNDERLINED = "underlined"
@@ -94,6 +108,8 @@ fld public final static java.lang.String TITLE_BAR_SHOW_TITLE = "JRootPane.title
 fld public final static java.lang.String TREE_PAINT_SELECTION = "JTree.paintSelection"
 fld public final static java.lang.String TREE_WIDE_SELECTION = "JTree.wideSelection"
 fld public final static java.lang.String USE_WINDOW_DECORATIONS = "JRootPane.useWindowDecorations"
+fld public final static java.lang.String WINDOW_STYLE = "Window.style"
+fld public final static java.lang.String WINDOW_STYLE_SMALL = "small"
 meth public static <%0 extends java.lang.Object> {%%0} clientProperty(javax.swing.JComponent,java.lang.String,{%%0},java.lang.Class<{%%0}>)
 meth public static boolean clientPropertyBoolean(javax.swing.JComponent,java.lang.String,boolean)
 meth public static boolean clientPropertyEquals(javax.swing.JComponent,java.lang.String,java.lang.Object)
@@ -237,7 +253,7 @@ meth public void setExtraDefaults(java.util.Map<java.lang.String,java.lang.Strin
 meth public void uninitialize()
 meth public void unregisterUIDefaultsGetter(java.util.function.Function<java.lang.Object,java.lang.Object>)
 supr javax.swing.plaf.basic.BasicLookAndFeel
-hfds DESKTOPFONTHINTS,aquaLoaded,customDefaultsSources,desktopPropertyListener,desktopPropertyName,desktopPropertyName2,extraDefaults,getUIMethod,getUIMethodInitialized,globalExtraDefaults,mnemonicHandler,oldPopupFactory,postInitialization,preferredFontFamily,preferredLightFontFamily,preferredMonospacedFontFamily,preferredSemiboldFontFamily,subMenuUsabilityHelperInstalled,systemColorGetter,uiDefaultsGetters,updateUIPending
+hfds DESKTOPFONTHINTS,aquaLoaded,customDefaultsSources,desktopPropertyListener,desktopPropertyName,desktopPropertyName2,extraDefaults,globalExtraDefaults,mnemonicHandler,oldPopupFactory,postInitialization,preferredFontFamily,preferredLightFontFamily,preferredMonospacedFontFamily,preferredSemiboldFontFamily,subMenuUsabilityHelperInstalled,systemColorGetter,uiDefaultsGetters,updateUIPending
 hcls ActiveFont,FlatUIDefaults,ImageIconUIResource
 
 CLSS public abstract interface static com.formdev.flatlaf.FlatLaf$DisabledIconProvider
@@ -278,6 +294,8 @@ fld public final static java.lang.String UI_SCALE_ALLOW_SCALE_DOWN = "flatlaf.ui
 fld public final static java.lang.String UI_SCALE_ENABLED = "flatlaf.uiScale.enabled"
 fld public final static java.lang.String UPDATE_UI_ON_SYSTEM_FONT_CHANGE = "flatlaf.updateUIOnSystemFontChange"
 fld public final static java.lang.String USE_JETBRAINS_CUSTOM_DECORATIONS = "flatlaf.useJetBrainsCustomDecorations"
+ anno 0 java.lang.Deprecated()
+fld public final static java.lang.String USE_NATIVE_LIBRARY = "flatlaf.useNativeLibrary"
 fld public final static java.lang.String USE_TEXT_Y_CORRECTION = "flatlaf.useTextYCorrection"
 fld public final static java.lang.String USE_UBUNTU_FONT = "flatlaf.useUbuntuFont"
 fld public final static java.lang.String USE_WINDOW_DECORATIONS = "flatlaf.useWindowDecorations"
@@ -296,7 +314,7 @@ meth public static boolean setup(java.io.InputStream)
 meth public static com.formdev.flatlaf.FlatLaf createLaf(com.formdev.flatlaf.IntelliJTheme)
 meth public static com.formdev.flatlaf.FlatLaf createLaf(java.io.InputStream) throws java.io.IOException
 supr java.lang.Object
-hfds checkboxDuplicateColors,checkboxKeyMapping,colors,icons,isMaterialUILite,namedColors,ui,uiKeyCopying,uiKeyInverseMapping,uiKeyMapping
+hfds checkboxDuplicateColors,checkboxKeyMapping,colors,icons,isMaterialUILite,namedColors,ui,uiKeyCopying,uiKeyDoNotOverride,uiKeyExcludes,uiKeyInverseMapping,uiKeyMapping
 
 CLSS public static com.formdev.flatlaf.IntelliJTheme$ThemeLaf
  outer com.formdev.flatlaf.IntelliJTheme

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatClientProperties.java

@@ -17,6 +17,8 @@
 package com.formdev.flatlaf;
 
 import java.awt.Color;
+import java.awt.IllegalComponentStateException;
+import java.awt.Window;
 import java.util.Objects;
 import javax.swing.JComponent;
 import javax.swing.SwingConstants;
@@ -31,7 +33,7 @@ public interface FlatClientProperties
 	//---- JButton ------------------------------------------------------------
 
 	/**
-	 * Specifies type of a button.
+	 * Specifies type of button.
 	 * <p>
 	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
 	 * <strong>Value type</strong> {@link java.lang.String}<br>
@@ -100,6 +102,17 @@ public interface FlatClientProperties
 	 */
 	String BUTTON_TYPE_BORDERLESS = "borderless";
 
+	/**
+	 * Specifies whether the button preferred size will be made square (quadratically).
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String SQUARE_SIZE = "JButton.squareSize";
+
+
+	//---- JCheckBox ----------------------------------------------------------
+
 	/**
 	 * Specifies selected state of a checkbox.
 	 * <p>
@@ -116,13 +129,6 @@ public interface FlatClientProperties
 	 */
 	String SELECTED_STATE_INDETERMINATE = "indeterminate";
 
-	/**
-	 * Specifies whether the button preferred size will be made square (quadratically).
-	 * <p>
-	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
-	 * <strong>Value type</strong> {@link java.lang.Boolean}
-	 */
-	String SQUARE_SIZE = "JButton.squareSize";
 
 	//---- JComponent ---------------------------------------------------------
 
@@ -254,20 +260,156 @@ public interface FlatClientProperties
 	String COMPONENT_FOCUS_OWNER = "JComponent.focusOwner";
 
 	/**
-	 * Specifies whether a component in an embedded menu bar should behave as caption
+	 * Specifies whether a component shown in a window title bar area should behave as caption
 	 * (left-click allows moving window, right-click shows window system menu).
-	 * The component does not receive mouse pressed/released/clicked/dragged events,
+	 * The caption component does not receive mouse pressed/released/clicked/dragged events,
 	 * but it gets mouse entered/exited/moved events.
 	 * <p>
+	 * Since 3.4, this client property also supports using a function that can check
+	 * whether a given location in the component should behave as caption.
+	 * Useful for components that do not use mouse input on whole component bounds.
+	 *
+	 * <pre>{@code
+	 * myComponent.putClientProperty( "JComponent.titleBarCaption",
+	 *     (Function<Point, Boolean>) pt -> {
+	 *         // parameter pt contains mouse location (in myComponent coordinates)
+	 *         // return true if the component is not interested in mouse input at the given location
+	 *         // return false if the component wants process mouse input at the given location
+	 *         // return null if the component children should be checked
+	 *         return ...; // check here
+	 *     } );
+	 * }</pre>
+	 * <b>Warning</b>:
+	 * <ul>
+	 *   <li>This function is invoked often when mouse is moved over window title bar area
+	 *       and should therefore return quickly.
+	 *   <li>This function is invoked on 'AWT-Windows' thread (not 'AWT-EventQueue' thread)
+	 *       while processing Windows messages.
+	 *       It <b>must not</b> change any component property or layout because this could cause a dead lock.
+	 * </ul>
+	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
-	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 * <strong>Value type</strong> {@link java.lang.Boolean} or {@link java.util.function.Function}&lt;Point, Boolean&gt;
 	 *
 	 * @since 2.5
 	 */
 	String COMPONENT_TITLE_BAR_CAPTION = "JComponent.titleBarCaption";
 
+
+	//---- Panel --------------------------------------------------------------
+
+	/**
+	 * Marks the panel as placeholder for the iconfify/maximize/close buttons
+	 * in fullWindowContent mode. See {@link #FULL_WINDOW_CONTENT}.
+	 * <p>
+	 * If fullWindowContent mode is enabled, the preferred size of the panel is equal
+	 * to the size of the iconfify/maximize/close buttons. Otherwise is is {@code 0,0}.
+	 * <p>
+	 * You're responsible to layout that panel at the top-left or top-right corner,
+	 * depending on platform, where the iconfify/maximize/close buttons are located.
+	 * <p>
+	 * Syntax of the value string is: {@code "win|mac [horizontal|vertical] [zeroInFullScreen] [leftToRight|rightToLeft]"}.
+	 * <p>
+	 * The string must start with {@code "win"} (for Windows or Linux) or
+	 * with {@code "mac"} (for macOS) and specifies the platform where the placeholder
+	 * should be used. On macOS, you need the placeholder in the top-left corner,
+	 * but on Windows/Linux you need it in the top-right corner. So if your application supports
+	 * fullWindowContent mode on both platforms, you can add two placeholders to your layout
+	 * and FlatLaf automatically uses only one of them. The other gets size {@code 0,0}.
+	 * <p>
+	 * Optionally, you can append following options to the value string (separated by space characters):
+	 * <ul>
+	 *   <li>{@code "horizontal"} - preferred height is zero
+	 *   <li>{@code "vertical"} - preferred width is zero
+	 *   <li>{@code "zeroInFullScreen"} - in full-screen mode on macOS, preferred size is {@code 0,0}
+	 *   <li>{@code "leftToRight"} - in right-to-left component orientation, preferred size is {@code 0,0}
+	 *   <li>{@code "rightToLeft"} - in left-to-right component orientation, preferred size is {@code 0,0}
+	 * </ul>
+	 *
+	 * Example for adding placeholder to top-left corner on macOS:
+	 * <pre>{@code
+	 * JPanel placeholder = new JPanel();
+	 * placeholder.putClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER, "mac" );
+     *
+     * JToolBar toolBar = new JToolBar();
+     * // add tool bar items
+     *
+	 * JPanel toolBarPanel = new JPanel( new BorderLayout() );
+	 * toolBarPanel.add( placeholder, BorderLayout.WEST );
+	 * toolBarPanel.add( toolBar, BorderLayout.CENTER );
+	 *
+	 * frame.getContentPane().add( toolBarPanel, BorderLayout.NORTH );
+	 * }</pre>
+	 *
+	 * Or add placeholder as first item to the tool bar:
+	 * <pre>{@code
+	 * JPanel placeholder = new JPanel();
+	 * placeholder.putClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER, "mac" );
+	 *
+	 * JToolBar toolBar = new JToolBar();
+	 * toolBar.add( placeholder );
+	 * // add tool bar items
+	 *
+	 * frame.getContentPane().add( toolBar, BorderLayout.NORTH );
+	 * }</pre>
+	 *
+	 * If a tabbed pane is located at the top, you can add the placeholder
+	 * as leading component to that tabbed pane:
+	 * <pre>{@code
+	 * JPanel placeholder = new JPanel();
+	 * placeholder.putClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER, "mac" );
+	 *
+	 * tabbedPane.putClientProperty( FlatClientProperties.TABBED_PANE_LEADING_COMPONENT, placeholder );
+	 * }</pre>
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JPanel}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}
+	 *
+	 * @since 3.4
+	 */
+	String FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER = "FlatLaf.fullWindowContent.buttonsPlaceholder";
+
+
 	//---- Popup --------------------------------------------------------------
 
+	/**
+	 * Specifies the popup border corner radius if the component is shown in a popup
+	 * or if the component is the owner of another component that is shown in a popup.
+	 * <p>
+	 * Note that this is not available on all platforms since it requires special support.
+	 * Supported platforms:
+	 * <ul>
+	 * <li><strong>Windows 11</strong>: Only two corner radiuses are supported
+	 *     by the OS: {@code DWMWCP_ROUND} is 8px and {@code DWMWCP_ROUNDSMALL} is 4px.
+	 *     If this value is {@code 1 - 4}, then {@code DWMWCP_ROUNDSMALL} is used.
+	 *     If it is {@code >= 5}, then {@code DWMWCP_ROUND} is used.
+	 * <li><strong>macOS</strong> (10.14 and later): Any corner radius is supported.
+	 * </ul>
+	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 *
+	 * @since 3.1
+	 */
+	String POPUP_BORDER_CORNER_RADIUS = "Popup.borderCornerRadius";
+
+	/**
+	 * Specifies the popup rounded border width if the component is shown in a popup
+	 * or if the component is the owner of another component that is shown in a popup.
+	 * <p>
+	 * Only used if popup uses rounded border.
+	 * <p>
+	 * Note that this is not available on all platforms since it requires special support.
+	 * Supported platforms:
+	 * <ul>
+	 * <li><strong>macOS</strong> (10.14 and later)
+	 * </ul>
+	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.Float}<br>
+	 *
+	 * @since 3.3
+	 */
+	String POPUP_ROUNDED_BORDER_WIDTH = "Popup.roundedBorderWidth";
+
 	/**
 	 * Specifies whether a drop shadow is painted if the component is shown in a popup
 	 * or if the component is the owner of another component that is shown in a popup.
@@ -286,6 +428,7 @@ public interface FlatClientProperties
 	 */
 	String POPUP_FORCE_HEAVY_WEIGHT = "Popup.forceHeavyWeight";
 
+
 	//---- JProgressBar -------------------------------------------------------
 
 	/**
@@ -304,6 +447,7 @@ public interface FlatClientProperties
 	 */
 	String PROGRESS_BAR_SQUARE = "JProgressBar.square";
 
+
 	//---- JRootPane ----------------------------------------------------------
 
 	/**
@@ -344,6 +488,46 @@ public interface FlatClientProperties
 	 */
 	String MENU_BAR_EMBEDDED = "JRootPane.menuBarEmbedded";
 
+	/**
+	 * Specifies whether the content pane (and the glass pane) should be extended
+	 * into the window title bar area
+	 * (requires enabled window decorations). Default is {@code false}.
+	 * <p>
+	 * On macOS, use client property {@code apple.awt.fullWindowContent}
+	 * (see <a href="https://www.formdev.com/flatlaf/macos/#full_window_content">macOS Full window content</a>).
+	 * <p>
+	 * Setting this enables/disables full window content
+	 * for the {@code JFrame} or {@code JDialog} that contains the root pane.
+	 * <p>
+	 * If {@code true}, the content pane (and the glass pane) is extended into
+	 * the title bar area. The window icon and title are hidden.
+	 * Only the iconfify/maximize/close buttons stay visible in the upper right corner
+	 * (and overlap the content pane).
+	 * <p>
+	 * The user can left-click-and-drag on the title bar area to move the window,
+	 * except when clicking on a component that processes mouse events (e.g. buttons or menus).
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 3.4
+	 */
+	String FULL_WINDOW_CONTENT = "FlatLaf.fullWindowContent";
+
+	/**
+	 * Contains the current bounds of the iconfify/maximize/close buttons
+	 * (in root pane coordinates) if fullWindowContent mode is enabled.
+	 * Otherwise its value is {@code null}.
+	 * <p>
+	 * <b>Note</b>: Do not set this client property. It is set by FlatLaf.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.awt.Rectangle}
+	 *
+	 * @since 3.4
+	 */
+	String FULL_WINDOW_CONTENT_BUTTONS_BOUNDS = "FlatLaf.fullWindowContent.buttonsBounds";
+
 	/**
 	 * Specifies whether the window icon should be shown in the window title bar
 	 * (requires enabled window decorations). Default is UI property {@code TitlePane.showIcon}.
@@ -377,10 +561,10 @@ public interface FlatClientProperties
 	String TITLE_BAR_SHOW_TITLE = "JRootPane.titleBarShowTitle";
 
 	/**
-	 * Specifies whether the "iconfify" button should be shown in the window title bar
+	 * Specifies whether the "iconify" button should be shown in the window title bar
 	 * (requires enabled window decorations). Default is {@code true}.
 	 * <p>
-	 * Setting this shows/hides the "iconfify" button
+	 * Setting this shows/hides the "iconify" button
 	 * for the {@code JFrame} that contains the root pane.
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
@@ -453,6 +637,37 @@ public interface FlatClientProperties
 	 */
 	String GLASS_PANE_FULL_HEIGHT = "JRootPane.glassPaneFullHeight";
 
+	/**
+	 * Specifies the style of the window title bar.
+	 * Besides the default title bar style, you can use a Utility-style title bar,
+	 * which is smaller than the default title bar.
+	 * <p>
+	 * On Windows 10/11, this requires FlatLaf window decorations.
+	 * On macOS, Java supports this out of the box.
+	 * <p>
+	 * Note that this client property must be set before the window becomes displayable.
+	 * Otherwise, an {@link IllegalComponentStateException} is thrown.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link #WINDOW_STYLE_SMALL}
+	 *
+	 * @since 3.2
+	 */
+	String WINDOW_STYLE = "Window.style";
+
+	/**
+	 * The window has Utility-style title bar, which is smaller than default title bar.
+	 * <p>
+	 * This is the same as using {@link Window#setType}( {@link Window.Type#UTILITY} ).
+	 *
+	 * @see #WINDOW_STYLE
+	 * @since 3.2
+	 */
+	String WINDOW_STYLE_SMALL = "small";
+
+
 	//---- JScrollBar / JScrollPane -------------------------------------------
 
 	/**
@@ -471,6 +686,7 @@ public interface FlatClientProperties
 	 */
 	String SCROLL_PANE_SMOOTH_SCROLLING = "JScrollPane.smoothScrolling";
 
+
 	//---- JSplitPane ---------------------------------------------------------
 
 	/**
@@ -505,6 +721,7 @@ public interface FlatClientProperties
 	 */
 	String SPLIT_PANE_EXPANDABLE_SIDE_RIGHT = "right";
 
+
 	//---- JTabbedPane --------------------------------------------------------
 
 	/**
@@ -770,7 +987,7 @@ public interface FlatClientProperties
 	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.String}<br>
 	 * <strong>Allowed Values</strong>
-	 *     {@link SwingConstants#LEADING} (default)
+	 *     {@link SwingConstants#LEADING} (default),
 	 *     {@link SwingConstants#TRAILING},
 	 *     {@link SwingConstants#CENTER},
 	 *     {@link #TABBED_PANE_ALIGN_LEADING} (default),
@@ -874,6 +1091,59 @@ public interface FlatClientProperties
 	 */
 	String TABBED_PANE_TAB_ICON_PLACEMENT = "JTabbedPane.tabIconPlacement";
 
+	/**
+	 * Specifies the rotation of the tabs (title, icon, etc.).
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link SwingConstants#LEFT},
+	 *     {@link SwingConstants#RIGHT},
+	 *     {@link #TABBED_PANE_TAB_ROTATION_NONE} (default),
+	 *     {@link #TABBED_PANE_TAB_ROTATION_AUTO},
+	 *     {@link #TABBED_PANE_TAB_ROTATION_LEFT} or
+	 *     {@link #TABBED_PANE_TAB_ROTATION_RIGHT}
+	 *
+	 * @since 3.3
+	 */
+	String TABBED_PANE_TAB_ROTATION = "JTabbedPane.tabRotation";
+
+	/**
+	 * Tabs are not rotated.
+	 *
+	 * @see #TABBED_PANE_TAB_ROTATION
+	 * @since 3.3
+	 */
+	String TABBED_PANE_TAB_ROTATION_NONE = "none";
+
+	/**
+	 * Tabs are rotated depending on tab placement.
+	 * <p>
+	 * For top and bottom tab placement, the tabs are not rotated.<br>
+	 * For left tab placement, the tabs are rotated counter-clockwise.<br>
+	 * For right tab placement, the tabs are rotated clockwise.
+	 *
+	 * @see #TABBED_PANE_TAB_ROTATION
+	 * @since 3.3
+	 */
+	String TABBED_PANE_TAB_ROTATION_AUTO = "auto";
+
+	/**
+	 * Tabs are rotated counter-clockwise.
+	 *
+	 * @see #TABBED_PANE_TAB_ROTATION
+	 * @since 3.3
+	 */
+	String TABBED_PANE_TAB_ROTATION_LEFT = "left";
+
+	/**
+	 * Tabs are rotated clockwise.
+	 *
+	 * @see #TABBED_PANE_TAB_ROTATION
+	 * @since 3.3
+	 */
+	String TABBED_PANE_TAB_ROTATION_RIGHT = "right";
+
 	/**
 	 * Specifies a component that will be placed at the leading edge of the tabs area.
 	 * <p>
@@ -900,6 +1170,7 @@ public interface FlatClientProperties
 	 */
 	String TABBED_PANE_TRAILING_COMPONENT = "JTabbedPane.trailingComponent";
 
+
 	//---- JTextField ---------------------------------------------------------
 
 	/**
@@ -1069,6 +1340,7 @@ public interface FlatClientProperties
 	 */
 	String TEXT_FIELD_CLEAR_CALLBACK = "JTextField.clearCallback";
 
+
 	//---- JToggleButton ------------------------------------------------------
 
 	/**
@@ -1076,8 +1348,8 @@ public interface FlatClientProperties
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
-	 * <strong>SupportedValues:</strong>
-	 *     {@link SwingConstants#BOTTOM} (default)
+	 * <strong>Allowed Values</strong>
+	 *     {@link SwingConstants#BOTTOM} (default),
 	 *     {@link SwingConstants#TOP},
 	 *     {@link SwingConstants#LEFT} or
 	 *     {@link SwingConstants#RIGHT}
@@ -1110,6 +1382,7 @@ public interface FlatClientProperties
 	 */
 	String TAB_BUTTON_SELECTED_BACKGROUND = "JToggleButton.tab.selectedBackground";
 
+
 	//---- JTree --------------------------------------------------------------
 
 	/**
@@ -1129,6 +1402,45 @@ public interface FlatClientProperties
 	 */
 	String TREE_PAINT_SELECTION = "JTree.paintSelection";
 
+
+	//---- macOS --------------------------------------------------------------
+
+	/**
+	 * Specifies the spacing around the macOS window close/minimize/zoom buttons.
+	 * Useful if <a href="https://www.formdev.com/flatlaf/macos/#full_window_content">full window content</a>
+	 * is enabled.
+	 * <p>
+	 * (requires macOS 10.14+ for "medium" spacing and macOS 11+ for "large" spacing, requires Java 17+)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link #MACOS_WINDOW_BUTTONS_SPACING_MEDIUM} or
+	 *     {@link #MACOS_WINDOW_BUTTONS_SPACING_LARGE} (requires macOS 11+)
+	 *
+	 * @since 3.4
+	 */
+	String MACOS_WINDOW_BUTTONS_SPACING = "FlatLaf.macOS.windowButtonsSpacing";
+
+	/**
+	 * Add medium spacing around the macOS window close/minimize/zoom buttons.
+	 *
+	 * @see #MACOS_WINDOW_BUTTONS_SPACING
+	 * @since 3.4
+	 */
+	String MACOS_WINDOW_BUTTONS_SPACING_MEDIUM = "medium";
+
+	/**
+	 * Add large spacing around the macOS window close/minimize/zoom buttons.
+	 * <p>
+	 * (requires macOS 11+; "medium" is used on older systems)
+	 *
+	 * @see #MACOS_WINDOW_BUTTONS_SPACING
+	 * @since 3.4
+	 */
+	String MACOS_WINDOW_BUTTONS_SPACING_LARGE = "large";
+
+
 	//---- helper methods -----------------------------------------------------
 
 	/**

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDefaultsAddon.java

@@ -48,7 +48,7 @@ public abstract class FlatDefaultsAddon
 	public InputStream getDefaults( Class<?> lafClass ) {
 		Class<?> addonClass = this.getClass();
 		String propertiesName = '/' + addonClass.getPackage().getName().replace( '.', '/' )
-			+ '/' + lafClass.getSimpleName() + ".properties";
+			+ '/' + UIDefaultsLoader.simpleClassName( lafClass ) + ".properties";
 		return addonClass.getResourceAsStream( propertiesName );
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatInputMaps.java

@@ -50,7 +50,8 @@ class FlatInputMaps
 		}
 
 		modifyInputMap( defaults, "ComboBox.ancestorInputMap",
-			"SPACE", "spacePopup",
+// Space key still shows popup, but from FlatComboBoxUI.FlatKeySelectionManager
+//			"SPACE", "spacePopup",
 
 			"UP", mac( "selectPrevious2", "selectPrevious" ),
 			"DOWN", mac( "selectNext2", "selectNext" ),
@@ -70,7 +71,7 @@ class FlatInputMaps
 			);
 		}
 
-		// join ltr and rtl bindings to fix up/down/etc keys in right-to-left component orientation
+		// join ltr and rtl bindings to fix up/down/etc. keys in right-to-left component orientation
 		Object[] bindings = (Object[]) defaults.get( "PopupMenu.selectedWindowInputMapBindings" );
 		Object[] rtlBindings = (Object[]) defaults.get( "PopupMenu.selectedWindowInputMapBindings.RightToLeft" );
 		if( bindings != null && rtlBindings != null ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java

@@ -30,9 +30,6 @@ import java.awt.image.ImageProducer;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.File;
-import java.lang.invoke.MethodHandle;
-import java.lang.invoke.MethodHandles;
-import java.lang.invoke.MethodType;
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.util.ArrayList;
@@ -71,12 +68,14 @@ import javax.swing.plaf.FontUIResource;
 import javax.swing.plaf.IconUIResource;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicLookAndFeel;
+import javax.swing.plaf.metal.MetalLookAndFeel;
 import javax.swing.text.StyleContext;
 import javax.swing.text.html.HTMLEditorKit;
 import com.formdev.flatlaf.ui.FlatNativeWindowBorder;
 import com.formdev.flatlaf.ui.FlatPopupFactory;
 import com.formdev.flatlaf.ui.FlatRootPaneUI;
 import com.formdev.flatlaf.ui.FlatUIUtils;
+import com.formdev.flatlaf.ui.JavaCompatibility2;
 import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.FontUtils;
 import com.formdev.flatlaf.util.GrayFilter;
@@ -182,17 +181,11 @@ public abstract class FlatLaf
 	 * This depends on the operating system and on the used Java runtime.
 	 * <p>
 	 * This method returns {@code true} on Windows 10/11 (see exception below)
-	 * and on Linux, {@code false} otherwise.
+	 * and on Linux, otherwise returns {@code false}.
+	 * <p>
+	 * Returns also {@code false} on Windows 10/11 if
+	 * FlatLaf native window border support is available (requires Windows 10/11).
 	 * <p>
-	 * Returns also {@code false} on Windows 10/11 if:
-	 * <ul>
-	 * <li>FlatLaf native window border support is available (requires Windows 10/11)</li>
-	 * <li>running in
-	 * <a href="https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime">JetBrains Runtime 11 (or later)</a>
-	 * (<a href="https://github.com/JetBrains/JetBrainsRuntime">source code on github</a>)
-	 * and JBR supports custom window decorations
-	 * </li>
-	 * </ul>
 	 * In these cases, custom decorations are enabled by the root pane.
 	 * Usage of {@link JFrame#setDefaultLookAndFeelDecorated(boolean)} or
 	 * {@link JDialog#setDefaultLookAndFeelDecorated(boolean)} is not necessary.
@@ -391,7 +384,7 @@ public abstract class FlatLaf
 				Method m = UIManager.class.getMethod( "createLookAndFeel", String.class );
 				aquaLaf = (BasicLookAndFeel) m.invoke( null, "Mac OS X" );
 			} else
-				aquaLaf = (BasicLookAndFeel) Class.forName( aquaLafClassName ).getDeclaredConstructor().newInstance();
+				aquaLaf = Class.forName( aquaLafClassName ).asSubclass( BasicLookAndFeel.class ).getDeclaredConstructor().newInstance();
 		} catch( Exception ex ) {
 			LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to initialize Aqua look and feel '" + aquaLafClassName + "'.", ex );
 			throw new IllegalStateException();
@@ -543,7 +536,7 @@ public abstract class FlatLaf
 		// which can happen in applications that use some plugin system
 		// and load FlatLaf in a plugin that uses its own classloader.
 		// (e.g. Apache NetBeans)
-		if( defaults.get( "FileChooser.fileNameHeaderText" ) != null )
+		if( defaults.get( "TabbedPane.moreTabsButtonToolTipText" ) != null )
 			return;
 
 		// load FlatLaf resource bundle and add content to defaults
@@ -581,10 +574,13 @@ public abstract class FlatLaf
 		Object activeFont = new ActiveFont( null, null, -1, 0, 0, 0, 0 );
 
 		// override fonts
+		List<String> fontKeys = new ArrayList<>( 50 );
 		for( Object key : defaults.keySet() ) {
 			if( key instanceof String && (((String)key).endsWith( ".font" ) || ((String)key).endsWith( "Font" )) )
-				defaults.put( key, activeFont );
+				fontKeys.add( (String) key );
 		}
+		for( String key : fontKeys )
+			defaults.put( key, activeFont );
 
 		// add fonts that are not set in BasicLookAndFeel
 		defaults.put( "RootPane.font", activeFont );
@@ -1291,8 +1287,8 @@ public abstract class FlatLaf
 	 * @since 2.5
 	 */
 	public static Map<String, Class<?>> getStyleableInfos( JComponent c ) {
-		StyleableUI ui = getStyleableUI( c );
-		return (ui != null) ? ui.getStyleableInfos( c ) : null;
+		ComponentUI ui = JavaCompatibility2.getUI( c );
+		return (ui instanceof StyleableUI) ? ((StyleableUI)ui).getStyleableInfos( c ) : null;
 	}
 
 	/**
@@ -1304,41 +1300,10 @@ public abstract class FlatLaf
 	 */
 	@SuppressWarnings( "unchecked" )
 	public static <T> T getStyleableValue( JComponent c, String key ) {
-		StyleableUI ui = getStyleableUI( c );
-		return (ui != null) ? (T) ui.getStyleableValue( c, key ) : null;
+		ComponentUI ui = JavaCompatibility2.getUI( c );
+		return (ui instanceof StyleableUI) ? (T) ((StyleableUI)ui).getStyleableValue( c, key ) : null;
 	}
 
-	private static StyleableUI getStyleableUI( JComponent c ) {
-		if( !getUIMethodInitialized ) {
-			getUIMethodInitialized = true;
-
-			if( SystemInfo.isJava_9_orLater ) {
-				try {
-					// JComponent.getUI() is available since Java 9
-					getUIMethod = MethodHandles.lookup().findVirtual( JComponent.class, "getUI",
-						MethodType.methodType( ComponentUI.class ) );
-				} catch( Exception ex ) {
-					// ignore
-				}
-			}
-		}
-
-		try {
-			Object ui;
-			if( getUIMethod != null )
-				ui = getUIMethod.invoke( c );
-			else
-				ui = c.getClass().getMethod( "getUI" ).invoke( c );
-			return (ui instanceof StyleableUI) ? (StyleableUI) ui : null;
-		} catch( Throwable ex ) {
-			// ignore
-			return null;
-		}
-	}
-
-	private static boolean getUIMethodInitialized;
-	private static MethodHandle getUIMethod;
-
 	/**
 	 * Returns the preferred font family to be used for (nearly) all fonts; or {@code null}.
 	 *
@@ -1428,26 +1393,36 @@ public abstract class FlatLaf
 	private class FlatUIDefaults
 		extends UIDefaults
 	{
+		private UIDefaults metalDefaults;
+
 		FlatUIDefaults( int initialCapacity, float loadFactor ) {
 			super( initialCapacity, loadFactor );
 		}
 
 		@Override
 		public Object get( Object key ) {
-			Object value = getValue( key );
-			return (value != null) ? (value != NULL_VALUE ? value : null) : super.get( key );
+			return get( key, null );
 		}
 
 		@Override
 		public Object get( Object key, Locale l ) {
-			Object value = getValue( key );
-			return (value != null) ? (value != NULL_VALUE ? value : null) : super.get( key, l );
+			Object value = getFromUIDefaultsGetters( key );
+			if( value != null )
+				return (value != NULL_VALUE) ? value : null;
+
+			value = super.get( key, l );
+			if( value != null )
+				return value;
+
+			// get file chooser texts from Metal
+			return (key instanceof String && ((String)key).startsWith( "FileChooser." ))
+				? getFromMetal( (String) key, l )
+				: null;
 		}
 
-		private Object getValue( Object key ) {
+		private Object getFromUIDefaultsGetters( Object key ) {
 			// use local variable for getters to avoid potential multi-threading issues
 			List<Function<Object, Object>> uiDefaultsGetters = FlatLaf.this.uiDefaultsGetters;
-
 			if( uiDefaultsGetters == null )
 				return null;
 
@@ -1459,6 +1434,22 @@ public abstract class FlatLaf
 
 			return null;
 		}
+
+		private synchronized Object getFromMetal( String key, Locale l ) {
+			if( metalDefaults == null ) {
+				metalDefaults = new MetalLookAndFeel() {
+					// avoid unnecessary initialization
+					@Override protected void initClassDefaults( UIDefaults table ) {}
+					@Override protected void initSystemColorDefaults( UIDefaults table ) {}
+				}.getDefaults();
+
+				// empty not needed defaults (to save memory) because we're only interested
+				// in resource bundle strings, which are stored in another internal map
+				metalDefaults.clear();
+			}
+
+			return metalDefaults.get( key, l );
+		}
 	}
 
 	//---- class ActiveFont ---------------------------------------------------
@@ -1541,7 +1532,7 @@ public abstract class FlatLaf
 			int newStyle = (style != -1)
 				? style
 				: (styleChange != 0)
-					? baseStyle & ~((styleChange >> 16) & 0xffff) | (styleChange & 0xffff)
+					? (baseStyle & ~((styleChange >> 16) & 0xffff)) | (styleChange & 0xffff)
 					: baseStyle;
 
 			// new size

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatPropertiesLaf.java

@@ -21,6 +21,7 @@ import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
+import java.util.Locale;
 import java.util.Properties;
 
 /**
@@ -96,7 +97,7 @@ public class FlatPropertiesLaf
 	protected ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
 		ArrayList<Class<?>> lafClasses = new ArrayList<>();
 		lafClasses.add( FlatLaf.class );
-		switch( baseTheme.toLowerCase() ) {
+		switch( baseTheme.toLowerCase( Locale.ENGLISH ) ) {
 			default:
 			case "light":
 				lafClasses.add( FlatLightLaf.class );

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatSystemProperties.java

@@ -103,7 +103,10 @@ public interface FlatSystemProperties
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
 	 * <strong>Default</strong> {@code false} (since v2; was {@code true} in v1)
+	 *
+	 * @deprecated No longer used since FlatLaf 3.3. Retained for API compatibility.
 	 */
+	@Deprecated
 	String USE_JETBRAINS_CUSTOM_DECORATIONS = "flatlaf.useJetBrainsCustomDecorations";
 
 	/**
@@ -150,24 +153,52 @@ public interface FlatSystemProperties
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
 	 * <strong>Default</strong> {@code true}
+	 *
 	 * @since 2.5
 	 */
 	String UPDATE_UI_ON_SYSTEM_FONT_CHANGE = "flatlaf.updateUIOnSystemFontChange";
 
 	/**
-	 * Specifies a directory in which the native FlatLaf libraries have been extracted.
+	 * Specifies whether FlatLaf native library should be used.
+	 * <p>
+	 * Setting this to {@code false} disables loading native library,
+	 * which also disables some features that depend on the native library.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 *
+	 * @since 3.2
+	 */
+	String USE_NATIVE_LIBRARY = "flatlaf.useNativeLibrary";
+
+	/**
+	 * Specifies a directory in which the FlatLaf native libraries are searched for.
 	 * The path can be absolute or relative to current application working directory.
 	 * This can be used to avoid extraction of the native libraries to the temporary directory at runtime.
 	 * <p>
-	 * If the value is {@code "system"}, then {@link System#loadLibrary(String)} is
-	 * used to load the native library.
-	 * Searches for the native library in classloader of caller
+	 * If the value is {@code "system"} (supported since FlatLaf 2.6),
+	 * then {@link System#loadLibrary(String)} is used to load the native library.
+	 * This searches for the native library in classloader of caller
 	 * (using {@link ClassLoader#findLibrary(String)}) and in paths specified
 	 * in system properties {@code sun.boot.library.path} and {@code java.library.path}.
-	 * (supported since FlatLaf 2.6)
 	 * <p>
-	 * If the native library can not loaded from the given path (or via {@link System#loadLibrary(String)}),
+	 * If the native library can not be loaded from the given path (or via {@link System#loadLibrary(String)}),
 	 * then the embedded native library is extracted to the temporary directory and loaded from there.
+	 * <p>
+	 * The file names of the native libraries must be either:
+	 * <ul>
+	 *   <li>the same as in flatlaf.jar in package 'com/formdev/flatlaf/natives' (required for "system") or
+	 *   <li>when downloaded from Maven central then as described here:
+	 *     <a href="https://www.formdev.com/flatlaf/native-libraries/">https://www.formdev.com/flatlaf/native-libraries/</a>
+	 *     (requires FlatLaf 3.4)
+	 * </ul>
+	 * <p>
+	 * <strong>Note</strong>: Since FlatLaf 3.1 it is recommended to download the
+	 * FlatLaf native libraries from Maven central and distribute them with your
+	 * application in the same directory as flatlaf.jar.
+	 * Then it is <strong>not necessary</strong> to set this system property.
+	 * See <a href="https://www.formdev.com/flatlaf/native-libraries/">https://www.formdev.com/flatlaf/native-libraries/</a>
+	 * for details.
 	 *
 	 * @since 2
 	 */

flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java

@@ -23,13 +23,17 @@ import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.Map.Entry;
 import javax.swing.UIDefaults;
 import javax.swing.plaf.ColorUIResource;
 import com.formdev.flatlaf.json.Json;
@@ -61,9 +65,9 @@ public class IntelliJTheme
 
 	private final boolean isMaterialUILite;
 
-	private final Map<String, String> colors;
-	private final Map<String, Object> ui;
-	private final Map<String, Object> icons;
+	private Map<String, String> colors;
+	private Map<String, Object> ui;
+	private Map<String, Object> icons;
 
 	private Map<String, ColorUIResource> namedColors = Collections.emptyMap();
 
@@ -196,8 +200,9 @@ public class IntelliJTheme
 		defaults.put( "HelpButton.focusedBackground", defaults.get( "Button.focusedBackground" ) );
 
 		// IDEA uses TextField.background for editable ComboBox and Spinner
-		defaults.put( "ComboBox.editableBackground", defaults.get( "TextField.background" ) );
-		defaults.put( "Spinner.background", defaults.get( "TextField.background" ) );
+		Object textFieldBackground = get( defaults, themeSpecificDefaults, "TextField.background" );
+		defaults.put( "ComboBox.editableBackground", textFieldBackground );
+		defaults.put( "Spinner.background", textFieldBackground );
 
 		// Spinner arrow button always has same colors as ComboBox arrow button
 		defaults.put( "Spinner.buttonBackground", defaults.get( "ComboBox.buttonEditableBackground" ) );
@@ -205,22 +210,41 @@ public class IntelliJTheme
 		defaults.put( "Spinner.buttonDisabledArrowColor", defaults.get( "ComboBox.buttonDisabledArrowColor" ) );
 
 		// some themes specify colors for TextField.background, but forget to specify it for other components
-		// (probably because those components are not used in IntelliJ)
-		if( uiKeys.contains( "TextField.background" ) ) {
-			Object textFieldBackground = defaults.get( "TextField.background" );
-			if( !uiKeys.contains( "FormattedTextField.background" ) )
-				defaults.put( "FormattedTextField.background", textFieldBackground );
-			if( !uiKeys.contains( "PasswordField.background" ) )
-				defaults.put( "PasswordField.background", textFieldBackground );
-			if( !uiKeys.contains( "EditorPane.background" ) )
-				defaults.put( "EditorPane.background", textFieldBackground );
-			if( !uiKeys.contains( "TextArea.background" ) )
-				defaults.put( "TextArea.background", textFieldBackground );
-			if( !uiKeys.contains( "TextPane.background" ) )
-				defaults.put( "TextPane.background", textFieldBackground );
-			if( !uiKeys.contains( "Spinner.background" ) )
-				defaults.put( "Spinner.background", textFieldBackground );
-		}
+		// (probably because those components are not used in IntelliJ IDEA)
+		putAll( defaults, textFieldBackground,
+			"EditorPane.background",
+			"FormattedTextField.background",
+			"PasswordField.background",
+			"TextArea.background",
+			"TextPane.background"
+		);
+		putAll( defaults, get( defaults, themeSpecificDefaults, "TextField.selectionBackground" ),
+			"EditorPane.selectionBackground",
+			"FormattedTextField.selectionBackground",
+			"PasswordField.selectionBackground",
+			"TextArea.selectionBackground",
+			"TextPane.selectionBackground"
+		);
+		putAll( defaults, get( defaults, themeSpecificDefaults, "TextField.selectionForeground" ),
+			"EditorPane.selectionForeground",
+			"FormattedTextField.selectionForeground",
+			"PasswordField.selectionForeground",
+			"TextArea.selectionForeground",
+			"TextPane.selectionForeground"
+		);
+
+		// fix disabled and not-editable backgrounds for text components, combobox and spinner
+		// (IntelliJ IDEA does not use those colors; instead it used background color of parent)
+		putAll( defaults, panelBackground,
+			"ComboBox.disabledBackground",
+			"EditorPane.disabledBackground", "EditorPane.inactiveBackground",
+			"FormattedTextField.disabledBackground", "FormattedTextField.inactiveBackground",
+			"PasswordField.disabledBackground", "PasswordField.inactiveBackground",
+			"Spinner.disabledBackground",
+			"TextArea.disabledBackground", "TextArea.inactiveBackground",
+			"TextField.disabledBackground", "TextField.inactiveBackground",
+			"TextPane.disabledBackground", "TextPane.inactiveBackground"
+		);
 
 		// fix ToggleButton
 		if( !uiKeys.contains( "ToggleButton.startBackground" ) && !uiKeys.contains( "*.startBackground" ) )
@@ -247,6 +271,33 @@ public class IntelliJTheme
 		if( rowHeight > 22 )
 			defaults.put( "Tree.rowHeight", 22 );
 
+		// get (and remove) theme specific wildcard replacements, which override all other defaults that end with same suffix
+		HashMap<String, Object> wildcards = new HashMap<>();
+		Iterator<Entry<Object, Object>> it = themeSpecificDefaults.entrySet().iterator();
+		while( it.hasNext() ) {
+			Entry<Object, Object> e = it.next();
+			String key = (String) e.getKey();
+			if( key.startsWith( "*." ) ) {
+				wildcards.put( key.substring( "*.".length() ), e.getValue() );
+				it.remove();
+			}
+		}
+
+		// override UI defaults with theme specific wildcard replacements
+		if( !wildcards.isEmpty() ) {
+			for( Object key : defaults.keySet().toArray() ) {
+				int dot;
+				if( !(key instanceof String) ||
+					(dot = ((String)key).lastIndexOf( '.' )) < 0 )
+				  continue;
+
+				String wildcardKey = ((String)key).substring( dot + 1 );
+				Object wildcardValue = wildcards.get( wildcardKey );
+				if( wildcardValue != null )
+					defaults.put( key, wildcardValue );
+			}
+		}
+
 		// apply theme specific UI defaults at the end to allow overwriting
 		for( Map.Entry<Object, Object> e : themeSpecificDefaults.entrySet() ) {
 			Object key = e.getKey();
@@ -261,6 +312,20 @@ public class IntelliJTheme
 
 			defaults.put( key, value );
 		}
+
+		// let Java release memory
+		colors = null;
+		ui = null;
+		icons = null;
+	}
+
+	private Object get( UIDefaults defaults, Map<Object, Object> themeSpecificDefaults, String key ) {
+		return themeSpecificDefaults.getOrDefault( key, defaults.get( key ) );
+	}
+
+	private void putAll( UIDefaults defaults, Object value, String... keys ) {
+		for( String key : keys )
+			defaults.put( key, value );
 	}
 
 	private Map<Object, Object> removeThemeSpecificDefaults( UIDefaults defaults ) {
@@ -334,17 +399,30 @@ public class IntelliJTheme
 			if( "".equals( value ) )
 				return; // ignore empty value
 
-			uiKeys.add( key );
-
-			// fix ComboBox size and Spinner border in all Material UI Lite themes
-			if( isMaterialUILite && (key.equals( "ComboBox.padding" ) || key.equals( "Spinner.border" )) )
-				return; // ignore
+			// ignore some properties that affect sizes
+			if( key.endsWith( ".border" ) ||
+				key.endsWith( ".rowHeight" ) ||
+				key.equals( "ComboBox.padding" ) ||
+				key.equals( "Spinner.padding" ) ||
+				key.equals( "Tree.leftChildIndent" ) ||
+				key.equals( "Tree.rightChildIndent" ) )
+			  return; // ignore
 
 			// map keys
 			key = uiKeyMapping.getOrDefault( key, key );
 			if( key.isEmpty() )
 				return; // ignore key
 
+			// exclude properties
+			int dot = key.indexOf( '.' );
+			if( dot > 0 && uiKeyExcludes.contains( key.substring( 0, dot + 1 ) ) )
+				return;
+
+			if( uiKeyDoNotOverride.contains( key ) && uiKeys.contains( key ) )
+				return;
+
+			uiKeys.add( key );
+
 			String valueStr = value.toString();
 
 			// map named colors
@@ -390,7 +468,8 @@ public class IntelliJTheme
 				// replace all values in UI defaults that match the wildcard key
 				for( Object k : defaultsKeysCache ) {
 					if( k.equals( "Desktop.background" ) ||
-						k.equals( "DesktopIcon.background" ) )
+						k.equals( "DesktopIcon.background" ) ||
+						k.equals( "TabbedPane.focusColor" ) )
 					  continue;
 
 					if( k instanceof String ) {
@@ -461,7 +540,7 @@ public class IntelliJTheme
 
 	/**
 	 * Because IDEA uses SVGs for check boxes and radio buttons, the colors for
-	 * this two components are specified in "icons > ColorPalette".
+	 * these two components are specified in "icons > ColorPalette".
 	 * FlatLaf uses vector icons and expects colors for the two components in UI defaults.
 	 */
 	private void applyCheckBoxColors( UIDefaults defaults ) {
@@ -481,18 +560,6 @@ public class IntelliJTheme
 			if( !key.startsWith( "Checkbox." ) || !(value instanceof String) )
 				continue;
 
-			if( key.equals( "Checkbox.Background.Default" ) ||
-				key.equals( "Checkbox.Foreground.Selected" ) )
-			{
-				// This two keys do not work correctly in IDEA because they
-				// map SVG color "#ffffff" to another color, but checkBox.svg and
-				// radio.svg (in package com.intellij.ide.ui.laf.icons.intellij)
-				// use "#fff". So use white to get same appearance as in IDEA.
-				value = "#ffffff";
-			}
-
-			String key2 = checkboxDuplicateColors.get( key );
-
 			if( dark )
 				key = StringUtils.removeTrailing( key, ".Dark" );
 
@@ -506,6 +573,7 @@ public class IntelliJTheme
 				if( color != null ) {
 					defaults.put( newKey, color );
 
+					String key2 = checkboxDuplicateColors.get( key + ".Dark");
 					if( key2 != null ) {
 						// When IDEA replaces colors in SVGs it uses color values and not the keys
 						// from com.intellij.ide.ui.UITheme.colorPalette, but there are some keys that
@@ -570,17 +638,59 @@ public class IntelliJTheme
 			defaults.put( destKey, defaults.get( srcKey ) );
 	}
 
+	private static final Set<String> uiKeyExcludes;
+	private static final Set<String> uiKeyDoNotOverride;
 	/** Rename UI default keys (key --> value). */
 	private static final Map<String, String> uiKeyMapping = new HashMap<>();
 	/** Copy UI default keys (value --> key). */
-	private static final Map<String, String> uiKeyCopying = new HashMap<>();
+	private static final Map<String, String> uiKeyCopying = new LinkedHashMap<>();
 	private static final Map<String, String> uiKeyInverseMapping = new HashMap<>();
 	private static final Map<String, String> checkboxKeyMapping = new HashMap<>();
 	private static final Map<String, String> checkboxDuplicateColors = new HashMap<>();
 
 	static {
+		// IntelliJ UI properties that are not used in FlatLaf
+		uiKeyExcludes = new HashSet<>( Arrays.asList(
+			"ActionButton.", "ActionToolbar.", "ActionsList.", "AppInspector.", "AssignedMnemonic.", "Autocomplete.",
+			"AvailableMnemonic.",
+			"BigSpinner.", "Bookmark.", "BookmarkIcon.", "BookmarkMnemonicAssigned.", "BookmarkMnemonicAvailable.",
+			"BookmarkMnemonicCurrent.", "BookmarkMnemonicIcon.", "Borders.", "Breakpoint.",
+			"Canvas.", "CodeWithMe.", "ComboBoxButton.", "CompletionPopup.", "ComplexPopup.", "Content.",
+			"CurrentMnemonic.", "Counter.",
+			"Debugger.", "DebuggerPopup.", "DebuggerTabs.", "DefaultTabs.", "Dialog.", "DialogWrapper.", "DragAndDrop.",
+			"Editor.", "EditorGroupsTabs.", "EditorTabs.",
+			"FileColor.", "FlameGraph.", "Focus.",
+			"Git.", "Github.", "GotItTooltip.", "Group.", "Gutter.", "GutterTooltip.",
+			"HeaderColor.", "HelpTooltip.", "Hg.",
+			"IconBadge.", "InformationHint.", "InplaceRefactoringPopup.",
+			"Lesson.", "Link.", "LiveIndicator.",
+			"MainMenu.", "MainToolbar.", "MemoryIndicator.", "MlModelBinding.", "MnemonicIcon.",
+			"NavBar.", "NewClass.", "NewPSD.", "Notification.", "Notifications.", "NotificationsToolwindow.",
+			"OnePixelDivider.", "OptionButton.", "Outline.",
+			"ParameterInfo.", "Plugins.", "ProgressIcon.", "PsiViewer.",
+			"ReviewList.", "RunWidget.",
+			"ScreenView.", "SearchEverywhere.", "SearchFieldWithExtension.", "SearchMatch.", "SearchOption.",
+			"SearchResults.", "SegmentedButton.", "Settings.", "SidePanel.", "Space.", "SpeedSearch.", "StateWidget.",
+			"StatusBar.",
+			"Tag.", "TipOfTheDay.", "ToolbarComboWidget.", "ToolWindow.",
+			"UIDesigner.", "UnattendedHostStatus.",
+			"ValidationTooltip.", "VersionControl.",
+			"WelcomeScreen.",
+
+			// lower case
+			"darcula.", "dropArea.", "icons.", "intellijlaf.", "macOSWindow.", "material.", "tooltips.",
+
+			// possible typos in .theme.json files
+			"Checkbox.", "Toolbar.", "Tooltip.", "UiDesigner.", "link."
+		) );
+
+		uiKeyDoNotOverride = new HashSet<>( Arrays.asList(
+			"TabbedPane.selectedForeground"
+		) );
+
 		// ComboBox
 		uiKeyMapping.put( "ComboBox.background",                        "" ); // ignore
+		uiKeyMapping.put( "ComboBox.buttonBackground",                  "" ); // ignore
 		uiKeyMapping.put( "ComboBox.nonEditableBackground",             "ComboBox.background" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.background",            "ComboBox.buttonEditableBackground" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.disabledIconColor",     "ComboBox.buttonDisabledArrowColor" );
@@ -638,9 +748,9 @@ public class IntelliJTheme
 		uiKeyCopying.put( "Spinner.buttonDisabledSeparatorColor", "Component.disabledBorderColor" );
 
 		// TabbedPane
-		uiKeyCopying.put( "TabbedPane.selectedBackground",     "DefaultTabs.underlinedTabBackground" );
-		uiKeyCopying.put( "TabbedPane.selectedForeground",     "DefaultTabs.underlinedTabForeground" );
-		uiKeyCopying.put( "TabbedPane.inactiveUnderlineColor", "DefaultTabs.inactiveUnderlineColor" );
+		uiKeyMapping.put( "DefaultTabs.underlinedTabBackground", "TabbedPane.selectedBackground" );
+		uiKeyMapping.put( "DefaultTabs.underlinedTabForeground", "TabbedPane.selectedForeground" );
+		uiKeyMapping.put( "DefaultTabs.inactiveUnderlineColor",  "TabbedPane.inactiveUnderlineColor" );
 
 		// TitlePane
 		uiKeyCopying.put( "TitlePane.inactiveBackground",     "TitlePane.background" );

flatlaf-core/src/main/java/com/formdev/flatlaf/LinuxFontPolicy.java

@@ -23,11 +23,14 @@ import java.awt.GraphicsEnvironment;
 import java.awt.Toolkit;
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileReader;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 import java.util.StringTokenizer;
 import javax.swing.text.StyleContext;
 import com.formdev.flatlaf.util.LoggingFacade;
@@ -68,7 +71,7 @@ class LinuxFontPolicy
 			if( word.endsWith( "," ) )
 				word = word.substring( 0, word.length() - 1 ).trim();
 
-			String lword = word.toLowerCase();
+			String lword = word.toLowerCase( Locale.ENGLISH );
 			if( lword.equals( "italic" ) || lword.equals( "oblique" ) )
 				style |= Font.ITALIC;
 			else if( lword.equals( "bold" ) )
@@ -104,7 +107,7 @@ class LinuxFontPolicy
 			size = 1;
 
 		// handle logical font names
-		String logicalFamily = mapFcName( family.toLowerCase() );
+		String logicalFamily = mapFcName( family.toLowerCase( Locale.ENGLISH ) );
 		if( logicalFamily != null )
 			family = logicalFamily;
 
@@ -143,7 +146,7 @@ class LinuxFontPolicy
 				return createFont( Font.DIALOG, style, size, dsize );
 
 			// check whether last work contains some font weight (e.g. Ultra-Bold or Heavy)
-			String lastWord = family.substring( index + 1 ).toLowerCase();
+			String lastWord = family.substring( index + 1 ).toLowerCase( Locale.ENGLISH );
 			if( lastWord.contains( "bold" ) || lastWord.contains( "heavy" ) || lastWord.contains( "black" ) )
 				style |= Font.BOLD;
 
@@ -200,7 +203,7 @@ class LinuxFontPolicy
 	 * Gets the default font for KDE from KDE configuration files.
 	 *
 	 * The Swing fonts are not updated when the user changes system font size
-	 * (System Settings > Fonts > Force Font DPI). A application restart is necessary.
+	 * (System Settings > Fonts > Force Font DPI). An application restart is necessary.
 	 * This is the same behavior as in native KDE applications.
 	 *
 	 * The "display scale factor" (kdeglobals: [KScreen] > ScaleFactor) is not used
@@ -257,6 +260,7 @@ class LinuxFontPolicy
 		return createFont( family, style, size, dsize );
 	}
 
+	@SuppressWarnings( "MixedMutabilityReturnType" ) // Error Prone
 	private static List<String> readConfig( String filename ) {
 		File userHome = new File( System.getProperty( "user.home" ) );
 
@@ -277,7 +281,9 @@ class LinuxFontPolicy
 
 		// read config file
 		ArrayList<String> lines = new ArrayList<>( 200 );
-		try( BufferedReader reader = new BufferedReader( new FileReader( file ) ) ) {
+		try( BufferedReader reader = new BufferedReader( new InputStreamReader(
+			new FileInputStream( file ), StandardCharsets.US_ASCII ) ) )
+		{
 			String line;
 			while( (line = reader.readLine()) != null )
 				lines.add( line );

flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java

@@ -153,7 +153,7 @@ debug*/
 
 		// get invoker screen bounds
 		Component invoker = popup.getInvoker();
-		invokerBounds = (invoker != null)
+		invokerBounds = (invoker != null && invoker.isShowing())
 			? new Rectangle( invoker.getLocationOnScreen(), invoker.getSize() )
 			: null;
 
@@ -172,7 +172,7 @@ debug*/
 		targetTopY = popupLocation.y;
 		targetBottomY = popupLocation.y + popupSize.height;
 
-		// install own event queue to supress mouse events when mouse is moved within safe triangle
+		// install own event queue to suppress mouse events when mouse is moved within safe triangle
 		if( subMenuEventQueue == null )
 			subMenuEventQueue = new SubMenuEventQueue();
 

flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java

@@ -27,8 +27,12 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.StreamTokenizer;
 import java.io.StringReader;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Executable;
+import java.lang.reflect.Method;
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -157,7 +161,7 @@ class UIDefaultsLoader
 						classLoader = FlatLaf.class.getClassLoader();
 
 					for( Class<?> lafClass : lafClasses ) {
-						String propertiesName = packageName + '/' + lafClass.getSimpleName() + ".properties";
+						String propertiesName = packageName + '/' + simpleClassName( lafClass ) + ".properties";
 						try( InputStream in = classLoader.getResourceAsStream( propertiesName ) ) {
 							if( in != null )
 								properties.load( in );
@@ -167,7 +171,7 @@ class UIDefaultsLoader
 					// load from package URL
 					URL packageUrl = (URL) source;
 					for( Class<?> lafClass : lafClasses ) {
-						URL propertiesUrl = new URL( packageUrl + lafClass.getSimpleName() + ".properties" );
+						URL propertiesUrl = new URL( packageUrl + simpleClassName( lafClass ) + ".properties" );
 
 						try( InputStream in = propertiesUrl.openStream() ) {
 							properties.load( in );
@@ -179,7 +183,7 @@ class UIDefaultsLoader
 					// load from folder
 					File folder = (File) source;
 					for( Class<?> lafClass : lafClasses ) {
-						File propertiesFile = new File( folder, lafClass.getSimpleName() + ".properties" );
+						File propertiesFile = new File( folder, simpleClassName( lafClass ) + ".properties" );
 						if( !propertiesFile.isFile() )
 							continue;
 
@@ -271,8 +275,9 @@ class UIDefaultsLoader
 					continue;
 				}
 
-				String value = resolveValue( (String) e.getValue(), propertiesGetter );
+				String value = (String) e.getValue();
 				try {
+					value = resolveValue( value, propertiesGetter );
 					defaults.put( key, parseValue( key, value, null, null, resolver, addonClassLoaders ) );
 				} catch( RuntimeException ex ) {
 					logParseError( key, value, ex, true );
@@ -289,6 +294,14 @@ class UIDefaultsLoader
 		}
 	}
 
+	/**
+	 * Similar to Class.getSimpleName(), but includes enclosing class for nested classes.
+	 */
+	static String simpleClassName( Class<?> cls ) {
+		String className = cls.getName();
+		return className.substring( className.lastIndexOf( '.' ) + 1 );
+	}
+
 	static void logParseError( String key, String value, RuntimeException ex, boolean severe ) {
 		String message = "FlatLaf: Failed to parse: '" + key + '=' + value + '\'';
 		if( severe )
@@ -297,7 +310,9 @@ class UIDefaultsLoader
 			LoggingFacade.INSTANCE.logConfig( message, ex );
 	}
 
-	static String resolveValue( String value, Function<String, String> propertiesGetter ) {
+	static String resolveValue( String value, Function<String, String> propertiesGetter )
+		throws IllegalArgumentException
+	{
 		value = value.trim();
 		String value0 = value;
 
@@ -326,7 +341,9 @@ class UIDefaultsLoader
 		return resolveValue( newValue, propertiesGetter );
 	}
 
-	static String resolveValueFromUIManager( String value ) {
+	static String resolveValueFromUIManager( String value )
+		throws IllegalArgumentException
+	{
 		if( value.startsWith( VARIABLE_PREFIX ) ) {
 			@SuppressWarnings( "unchecked" )
 			Map<String, String> variables = (Map<String, String>) UIManager.get( KEY_VARIABLES );
@@ -334,7 +351,7 @@ class UIDefaultsLoader
 			if( newValue == null )
 				throw new IllegalArgumentException( "variable '" + value + "' not found" );
 
-			return newValue;
+			return resolveValueFromUIManager( newValue );
 		}
 
 		if( !value.startsWith( PROPERTY_PREFIX ) )
@@ -348,8 +365,11 @@ class UIDefaultsLoader
 		// convert binary color to string
 		if( newValue instanceof Color ) {
 			Color color = (Color) newValue;
+			int rgb = color.getRGB() & 0xffffff;
 			int alpha = color.getAlpha();
-			return String.format( (alpha != 255) ? "#%06x%02x" : "#%06x", color.getRGB() & 0xffffff, alpha );
+			return (alpha != 255)
+				? String.format( "#%06x%02x", rgb, alpha )
+				: String.format( "#%06x", rgb );
 		}
 
 		throw new IllegalArgumentException( "property value type '" + newValue.getClass().getName() + "' not supported in references" );
@@ -362,12 +382,15 @@ class UIDefaultsLoader
 	private static Map<Class<?>, ValueType> javaValueTypes;
 	private static Map<String, ValueType> knownValueTypes;
 
-	static Object parseValue( String key, String value, Class<?> valueType ) {
+	static Object parseValue( String key, String value, Class<?> valueType )
+		throws IllegalArgumentException
+	{
 		return parseValue( key, value, valueType, null, v -> v, Collections.emptyList() );
 	}
 
 	static Object parseValue( String key, String value, Class<?> javaValueType, ValueType[] resultValueType,
 		Function<String, String> resolver, List<ClassLoader> addonClassLoaders )
+			throws IllegalArgumentException
 	{
 		if( resultValueType == null )
 			resultValueType = tempResultValueType;
@@ -397,7 +420,7 @@ class UIDefaultsLoader
 		if( value.startsWith( "if(" ) && value.endsWith( ")" ) ) {
 			List<String> params = splitFunctionParams( value.substring( 3, value.length() - 1 ), ',' );
 			if( params.size() != 3 )
-				throwMissingParametersException( value );
+				throw newMissingParametersException( value );
 
 			boolean ifCondition = parseCondition( params.get( 0 ), resolver, addonClassLoaders );
 			String ifValue = params.get( ifCondition ? 1 : 2 );
@@ -537,7 +560,7 @@ class UIDefaultsLoader
 			case INTEGERORFLOAT:return parseIntegerOrFloat( value );
 			case FLOAT:			return parseFloat( value );
 			case BORDER:		return parseBorder( value, resolver, addonClassLoaders );
-			case ICON:			return parseInstance( value, addonClassLoaders );
+			case ICON:			return parseInstance( value, resolver, addonClassLoaders );
 			case INSETS:		return parseInsets( value );
 			case DIMENSION:		return parseDimension( value );
 			case COLOR:			return parseColorOrFunction( value, resolver );
@@ -546,7 +569,7 @@ class UIDefaultsLoader
 			case SCALEDFLOAT:	return parseScaledFloat( value );
 			case SCALEDINSETS:	return parseScaledInsets( value );
 			case SCALEDDIMENSION:return parseScaledDimension( value );
-			case INSTANCE:		return parseInstance( value, addonClassLoaders );
+			case INSTANCE:		return parseInstance( value, resolver, addonClassLoaders );
 			case CLASS:			return parseClass( value, addonClassLoaders );
 			case GRAYFILTER:	return parseGrayFilter( value );
 			case UNKNOWN:
@@ -608,9 +631,11 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Object parseBorder( String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
+	private static Object parseBorder( String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders )
+		throws IllegalArgumentException
+	{
 		if( value.indexOf( ',' ) >= 0 ) {
-			// top,left,bottom,right[,lineColor[,lineThickness[,arc]]]
+			// Syntax: top,left,bottom,right[,lineColor[,lineThickness[,arc]]]
 			List<String> parts = splitFunctionParams( value, ',' );
 			Insets insets = parseInsets( value );
 			ColorUIResource lineColor = (parts.size() >= 5)
@@ -625,13 +650,29 @@ class UIDefaultsLoader
 					: new FlatEmptyBorder( insets );
 			};
 		} else
-			return parseInstance( value, addonClassLoaders );
+			return parseInstance( value, resolver, addonClassLoaders );
 	}
 
-	private static Object parseInstance( String value, List<ClassLoader> addonClassLoaders ) {
+	private static Object parseInstance( String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
 		return (LazyValue) t -> {
 			try {
-				return findClass( value, addonClassLoaders ).getDeclaredConstructor().newInstance();
+				if( value.indexOf( ',' ) >= 0 ) {
+					// Syntax: className,param1,param2,...
+					List<String> parts = splitFunctionParams( value, ',' );
+					String className = parts.get( 0 );
+					Class<?> cls = findClass( className, addonClassLoaders );
+
+					Constructor<?>[] constructors = cls.getDeclaredConstructors();
+					Object result = invokeConstructorOrStaticMethod( constructors, parts, resolver );
+					if( result != null )
+						return result;
+
+					LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to instantiate '" + className
+						+ "': no constructor found for parameters '"
+						+ value.substring( value.indexOf( ',' + 1 ) ) + "'.", null );
+					return null;
+				} else
+					return findClass( value, addonClassLoaders ).getDeclaredConstructor().newInstance();
 			} catch( Exception ex ) {
 				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to instantiate '" + value + "'.", ex );
 				return null;
@@ -668,7 +709,9 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Insets parseInsets( String value ) {
+	private static Insets parseInsets( String value )
+		throws IllegalArgumentException
+	{
 		List<String> numbers = StringUtils.split( value, ',', true, false );
 		try {
 			return new InsetsUIResource(
@@ -681,7 +724,9 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Dimension parseDimension( String value ) {
+	private static Dimension parseDimension( String value )
+		throws IllegalArgumentException
+	{
 		List<String> numbers = StringUtils.split( value, ',', true, false );
 		try {
 			return new DimensionUIResource(
@@ -692,7 +737,9 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Object parseColorOrFunction( String value, Function<String, String> resolver ) {
+	private static Object parseColorOrFunction( String value, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		if( value.endsWith( ")" ) )
 			return parseColorFunctions( value, resolver );
 
@@ -702,10 +749,10 @@ class UIDefaultsLoader
 	/**
 	 * Parses a hex color in  {@code #RGB}, {@code #RGBA}, {@code #RRGGBB} or {@code #RRGGBBAA}
 	 * format and returns it as color object.
-	 *
-	 * @throws IllegalArgumentException
 	 */
-	static ColorUIResource parseColor( String value ) {
+	static ColorUIResource parseColor( String value )
+		throws IllegalArgumentException
+	{
 		int rgba = parseColorRGBA( value );
 		return ((rgba & 0xff000000) == 0xff000000)
 			? new ColorUIResource( rgba )
@@ -716,10 +763,10 @@ class UIDefaultsLoader
 	 * Parses a hex color in  {@code #RGB}, {@code #RGBA}, {@code #RRGGBB} or {@code #RRGGBBAA}
 	 * format and returns it as {@code rgba} integer suitable for {@link java.awt.Color},
 	 * which includes alpha component in bits 24-31.
-	 *
-	 * @throws IllegalArgumentException
 	 */
-	static int parseColorRGBA( String value ) {
+	static int parseColorRGBA( String value )
+		throws IllegalArgumentException
+	{
 		int len = value.length();
 		if( (len != 4 && len != 5 && len != 7 && len != 9) || value.charAt( 0 ) != '#' )
 			throw newInvalidColorException( value );
@@ -760,7 +807,9 @@ class UIDefaultsLoader
 		return new IllegalArgumentException( "invalid color '" + value + "'" );
 	}
 
-	private static Object parseColorFunctions( String value, Function<String, String> resolver ) {
+	private static Object parseColorFunctions( String value, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		int paramsStart = value.indexOf( '(' );
 		if( paramsStart < 0 )
 			throw new IllegalArgumentException( "missing opening parenthesis in function '" + value + "'" );
@@ -768,7 +817,7 @@ class UIDefaultsLoader
 		String function = StringUtils.substringTrimmed( value, 0, paramsStart );
 		List<String> params = splitFunctionParams( value.substring( paramsStart + 1, value.length() - 1 ), ',' );
 		if( params.isEmpty() )
-			throwMissingParametersException( value );
+			throw newMissingParametersException( value );
 
 		if( parseColorDepth > 100 )
 			throw new IllegalArgumentException( "endless recursion in color function '" + value + "'" );
@@ -813,9 +862,11 @@ class UIDefaultsLoader
 	 * This "if" function is only used if the "if" is passed as parameter to another
 	 * color function. Otherwise, the general "if" function is used.
 	 */
-	private static Object parseColorIf( String value, List<String> params, Function<String, String> resolver ) {
+	private static Object parseColorIf( String value, List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		if( params.size() != 3 )
-			throwMissingParametersException( value );
+			throw newMissingParametersException( value );
 
 		boolean ifCondition = parseCondition( params.get( 0 ), resolver, Collections.emptyList() );
 		String ifValue = params.get( ifCondition ? 1 : 2 );
@@ -827,9 +878,11 @@ class UIDefaultsLoader
 	 *   - name: system color name
 	 *   - defaultValue: default color value used if system color is not available
 	 */
-	private static Object parseColorSystemColor( String value, List<String> params, Function<String, String> resolver ) {
+	private static Object parseColorSystemColor( String value, List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		if( params.size() < 1 )
-			throwMissingParametersException( value );
+			throw newMissingParametersException( value );
 
 		ColorUIResource systemColor = getSystemColor( params.get( 0 ) );
 		if( systemColor != null )
@@ -869,6 +922,7 @@ class UIDefaultsLoader
 	 */
 	private static ColorUIResource parseColorRgbOrRgba( boolean hasAlpha, List<String> params,
 		Function<String, String> resolver )
+			throws IllegalArgumentException
 	{
 		if( hasAlpha && params.size() == 2 ) {
 			// syntax rgba(color,alpha), which allows adding alpha to any color
@@ -898,7 +952,9 @@ class UIDefaultsLoader
 	 *   - lightness: a percentage 0-100%
 	 *   - alpha: a percentage 0-100%
 	 */
-	private static ColorUIResource parseColorHslOrHsla( boolean hasAlpha, List<String> params ) {
+	private static ColorUIResource parseColorHslOrHsla( boolean hasAlpha, List<String> params )
+		throws IllegalArgumentException
+	{
 		int hue = parseInteger( params.get( 0 ), 0, 360, false );
 		int saturation = parsePercentage( params.get( 1 ) );
 		int lightness = parsePercentage( params.get( 2 ) );
@@ -918,6 +974,7 @@ class UIDefaultsLoader
 	 */
 	private static Object parseColorHSLIncreaseDecrease( int hslIndex, boolean increase,
 		List<String> params, Function<String, String> resolver )
+			throws IllegalArgumentException
 	{
 		String colorStr = params.get( 0 );
 		int amount = parsePercentage( params.get( 1 ) );
@@ -961,7 +1018,9 @@ class UIDefaultsLoader
 	 *   - amount: percentage 0-100%
 	 *   - options: [derived] [lazy]
 	 */
-	private static Object parseColorFade( List<String> params, Function<String, String> resolver ) {
+	private static Object parseColorFade( List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		String colorStr = params.get( 0 );
 		int amount = parsePercentage( params.get( 1 ) );
 		boolean derived = false;
@@ -995,7 +1054,9 @@ class UIDefaultsLoader
 	 *   - angle: number of degrees to rotate
 	 *   - options: [derived]
 	 */
-	private static Object parseColorSpin( List<String> params, Function<String, String> resolver ) {
+	private static Object parseColorSpin( List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		String colorStr = params.get( 0 );
 		int amount = parseInteger( params.get( 1 ) );
 		boolean derived = false;
@@ -1023,6 +1084,7 @@ class UIDefaultsLoader
 	 */
 	private static Object parseColorChange( int hslIndex,
 		List<String> params, Function<String, String> resolver )
+			throws IllegalArgumentException
 	{
 		String colorStr = params.get( 0 );
 		int value = (hslIndex == 0)
@@ -1051,7 +1113,9 @@ class UIDefaultsLoader
 	 *   - weight: the weight (in range 0-100%) to mix the two colors
 	 *             larger weight uses more of first color, smaller weight more of second color
 	 */
-	private static Object parseColorMix( String color1Str, List<String> params, Function<String, String> resolver ) {
+	private static Object parseColorMix( String color1Str, List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		int i = 0;
 		if( color1Str == null )
 			color1Str = params.get( i++ );
@@ -1078,7 +1142,9 @@ class UIDefaultsLoader
 	 *   - threshold: the threshold (in range 0-100%) to specify where the transition
 	 *                from "dark" to "light" is (default is 43%)
 	 */
-	private static Object parseColorContrast( List<String> params, Function<String, String> resolver ) {
+	private static Object parseColorContrast( List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		String colorStr = params.get( 0 );
 		String darkStr = params.get( 1 );
 		String lightStr = params.get( 2 );
@@ -1104,7 +1170,9 @@ class UIDefaultsLoader
 	 *                 the alpha of this color is used as weight to mix the two colors
 	 *   - background: a background color (e.g. #f00) or a color function
 	 */
-	private static ColorUIResource parseColorOver( List<String> params, Function<String, String> resolver ) {
+	private static ColorUIResource parseColorOver( List<String> params, Function<String, String> resolver )
+		throws IllegalArgumentException
+	{
 		String foregroundStr = params.get( 0 );
 		String backgroundStr = params.get( 1 );
 
@@ -1128,6 +1196,7 @@ class UIDefaultsLoader
 
 	private static Object parseFunctionBaseColor( String colorStr, ColorFunction function,
 		boolean derived, Function<String, String> resolver )
+			throws IllegalArgumentException
 	{
 		// parse base color
 		String resolvedColorStr = resolver.apply( colorStr );
@@ -1159,7 +1228,9 @@ class UIDefaultsLoader
 	/**
 	 * Syntax: [normal] [bold|+bold|-bold] [italic|+italic|-italic] [<size>|+<incr>|-<decr>|<percent>%] [family[, family]] [$baseFontKey]
 	 */
-	private static Object parseFont( String value ) {
+	private static Object parseFont( String value )
+		throws IllegalArgumentException
+	{
 		Object font = fontCache.get( value );
 		if( font != null )
 			return font;
@@ -1257,7 +1328,9 @@ class UIDefaultsLoader
 		return font;
 	}
 
-	private static int parsePercentage( String value ) {
+	private static int parsePercentage( String value )
+		throws IllegalArgumentException, NumberFormatException
+	{
 		if( !value.endsWith( "%" ) )
 			throw new NumberFormatException( "invalid percentage '" + value + "'" );
 
@@ -1273,7 +1346,9 @@ class UIDefaultsLoader
 		return val;
 	}
 
-	private static Boolean parseBoolean( String value ) {
+	private static Boolean parseBoolean( String value )
+		throws IllegalArgumentException
+	{
 		switch( value ) {
 			case "false":	return false;
 			case "true":	return true;
@@ -1281,13 +1356,17 @@ class UIDefaultsLoader
 		throw new IllegalArgumentException( "invalid boolean '" + value + "'" );
 	}
 
-	private static Character parseCharacter( String value ) {
+	private static Character parseCharacter( String value )
+		throws IllegalArgumentException
+	{
 		if( value.length() != 1 )
 			throw new IllegalArgumentException( "invalid character '" + value + "'" );
 		return value.charAt( 0 );
 	}
 
-	private static Integer parseInteger( String value, int min, int max, boolean allowPercentage ) {
+	private static Integer parseInteger( String value, int min, int max, boolean allowPercentage )
+		throws IllegalArgumentException, NumberFormatException
+	{
 		if( allowPercentage && value.endsWith( "%" ) ) {
 			int percent = parsePercentage( value );
 			return (max * percent) / 100;
@@ -1299,7 +1378,9 @@ class UIDefaultsLoader
 		return integer;
 	}
 
-	private static Integer parseInteger( String value ) {
+	private static Integer parseInteger( String value )
+		throws NumberFormatException
+	{
 		try {
 			return Integer.parseInt( value );
 		} catch( NumberFormatException ex ) {
@@ -1307,7 +1388,9 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Number parseIntegerOrFloat( String value ) {
+	private static Number parseIntegerOrFloat( String value )
+		throws NumberFormatException
+	{
 		try {
 			return Integer.parseInt( value );
 		} catch( NumberFormatException ex ) {
@@ -1319,7 +1402,9 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Float parseFloat( String value ) {
+	private static Float parseFloat( String value )
+		throws NumberFormatException
+	{
 		try {
 			return Float.parseFloat( value );
 		} catch( NumberFormatException ex ) {
@@ -1327,35 +1412,45 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static ActiveValue parseScaledInteger( String value ) {
+	private static ActiveValue parseScaledInteger( String value )
+		throws NumberFormatException
+	{
 		int val = parseInteger( value );
 		return t -> {
 			return UIScale.scale( val );
 		};
 	}
 
-	private static ActiveValue parseScaledFloat( String value ) {
+	private static ActiveValue parseScaledFloat( String value )
+		throws NumberFormatException
+	{
 		float val = parseFloat( value );
 		return t -> {
 			return UIScale.scale( val );
 		};
 	}
 
-	private static ActiveValue parseScaledInsets( String value ) {
+	private static ActiveValue parseScaledInsets( String value )
+		throws IllegalArgumentException
+	{
 		Insets insets = parseInsets( value );
 		return t -> {
 			return UIScale.scale( insets );
 		};
 	}
 
-	private static ActiveValue parseScaledDimension( String value ) {
+	private static ActiveValue parseScaledDimension( String value )
+		throws IllegalArgumentException
+	{
 		Dimension dimension = parseDimension( value );
 		return t -> {
 			return UIScale.scale( dimension );
 		};
 	}
 
-	private static Object parseGrayFilter( String value ) {
+	private static Object parseGrayFilter( String value )
+		throws IllegalArgumentException
+	{
 		List<String> numbers = StringUtils.split( value, ',', true, false );
 		try {
 			int brightness = Integer.parseInt( numbers.get( 0 ) );
@@ -1399,6 +1494,86 @@ class UIDefaultsLoader
 		return strs;
 	}
 
+	private static Object invokeConstructorOrStaticMethod( Executable[] constructorsOrMethods,
+			List<String> parts, Function<String, String> resolver )
+		throws Exception
+	{
+		// order constructors/methods by parameter types:
+		// - String parameters to the end
+		// - int before float parameters
+		constructorsOrMethods = constructorsOrMethods.clone();
+		Arrays.sort( constructorsOrMethods, (c1, c2) -> {
+			Class<?>[] ptypes1 = c1.getParameterTypes();
+			Class<?>[] ptypes2 = c2.getParameterTypes();
+			if( ptypes1.length != ptypes2.length )
+				return ptypes1.length - ptypes2.length;
+
+			for( int i = 0; i < ptypes1.length; i++ ) {
+				Class<?> pt1 = ptypes1[i];
+				Class<?> pt2 = ptypes2[i];
+
+				if( pt1 == pt2 )
+					continue;
+
+				// order methods with String parameters to the end
+				if( pt1 == String.class )
+					return 2;
+				if( pt2 == String.class )
+					return -2;
+
+				// order int before float
+				if( pt1 == int.class )
+					return -1;
+				if( pt2 == int.class )
+					return 1;
+			}
+			return 0;
+		} );
+
+		// search for best constructor/method for given parameter values
+		for( Executable cm : constructorsOrMethods ) {
+			if( cm.getParameterCount() != parts.size() - 1 )
+				continue;
+
+			Object[] params = parseMethodParams( cm.getParameterTypes(), parts, resolver );
+			if( params == null )
+				continue;
+
+			// invoke constructor or static method
+			if( cm instanceof Constructor )
+				return ((Constructor<?>)cm).newInstance( params );
+			else
+				return ((Method)cm).invoke( null, params );
+		}
+
+		return null;
+	}
+
+	private static Object[] parseMethodParams( Class<?>[] paramTypes, List<String> parts, Function<String, String> resolver ) {
+		Object[] params = new Object[paramTypes.length];
+		try {
+			for( int i = 0; i < params.length; i++ ) {
+				Class<?> paramType = paramTypes[i];
+				String paramValue = parts.get( i + 1 );
+				if( paramType == String.class )
+					params[i] = paramValue;
+				else if( paramType == boolean.class )
+					params[i] = parseBoolean( paramValue );
+				else if( paramType == int.class )
+					params[i] = parseInteger( paramValue );
+				else if( paramType == float.class )
+					params[i] = parseFloat( paramValue );
+				else if( paramType == Color.class )
+					params[i] = parseColorOrFunction( resolver.apply( paramValue ), resolver );
+				else
+					return null; // unsupported parameter type
+			}
+		} catch( IllegalArgumentException ex ) {
+			return null; // failed to parse parameter for expected parameter type
+		}
+		return params;
+	}
+
 	/**
 	 * For use in LazyValue to get value for given key from UIManager and report error
 	 * if not found. If key is prefixed by '?', then no error is reported.
@@ -1416,7 +1591,7 @@ class UIDefaultsLoader
 		return value;
 	}
 
-	private static void throwMissingParametersException( String value ) {
-		throw new IllegalArgumentException( "missing parameters in function '" + value + "'" );
+	private static IllegalArgumentException newMissingParametersException( String value ) {
+		return new IllegalArgumentException( "missing parameters in function '" + value + "'" );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatInternalFrameCloseIcon.java

@@ -53,8 +53,8 @@ public class FlatInternalFrameCloseIcon
 
 		g.setColor( FlatButtonUI.buttonStateColor( c, c.getForeground(), null, null, hoverForeground, pressedForeground ) );
 
-		float mx = width / 2;
-		float my = height / 2;
+		float mx = width / 2f;
+		float my = height / 2f;
 		float r = 3.25f;
 
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD, 4 );

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTabbedPaneCloseIcon.java

@@ -90,12 +90,12 @@ public class FlatTabbedPaneCloseIcon
 				closeSize.width, closeSize.height, closeArc, closeArc );
 		}
 
-		// set cross color
+		// set color of cross
 		Color fg = FlatButtonUI.buttonStateColor( c, closeForeground, null, null, closeHoverForeground, closePressedForeground );
 		g.setColor( FlatUIUtils.deriveColor( fg, c.getForeground() ) );
 
-		float mx = width / 2;
-		float my = height / 2;
+		float mx = width / 2f;
+		float my = height / 2f;
 		float r = ((bg != null) ? closeCrossFilledSize : closeCrossPlainSize) / 2;
 
 		// paint cross

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTreeOpenIcon.java

@@ -57,11 +57,11 @@ public class FlatTreeOpenIcon
 			double arc = 1.5;
 			double arc2 = 0.5;
 			path = FlatUIUtils.createPath( false,
-				// bottom-left of opend part
+				// bottom-left of opened part
 				2,13.5,
-				// top-left of opend part
+				// top-left of opened part
 				FlatUIUtils.ROUNDED, 4.5,7.5, arc,
-				// top-right of opend part
+				// top-right of opened part
 				FlatUIUtils.ROUNDED, 15.5,7.5, arc2,
 
 				// bottom-right

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowAbstractIcon.java

@@ -21,7 +21,6 @@ import java.awt.Component;
 import java.awt.Dimension;
 import java.awt.Graphics2D;
 import java.awt.RenderingHints;
-import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 import com.formdev.flatlaf.util.HiDPIUtils;
@@ -30,6 +29,7 @@ import com.formdev.flatlaf.util.HiDPIUtils;
  * Base class for window icons.
  *
  * @uiDefault TitlePane.buttonSize						Dimension
+ * @uiDefault TitlePane.buttonSymbolHeight				int
  * @uiDefault TitlePane.buttonHoverBackground			Color
  * @uiDefault TitlePane.buttonPressedBackground			Color
  *
@@ -38,17 +38,22 @@ import com.formdev.flatlaf.util.HiDPIUtils;
 public abstract class FlatWindowAbstractIcon
 	extends FlatAbstractIcon
 {
+	private final int symbolHeight;
 	private final Color hoverBackground;
 	private final Color pressedBackground;
 
-	public FlatWindowAbstractIcon() {
-		this( UIManager.getDimension( "TitlePane.buttonSize" ),
-			UIManager.getColor( "TitlePane.buttonHoverBackground" ),
-			UIManager.getColor( "TitlePane.buttonPressedBackground" ) );
+	/** @since 3.2 */
+	protected FlatWindowAbstractIcon( String windowStyle ) {
+		this( FlatUIUtils.getSubUIDimension( "TitlePane.buttonSize", windowStyle ),
+			FlatUIUtils.getSubUIInt( "TitlePane.buttonSymbolHeight", windowStyle, 10 ),
+			FlatUIUtils.getSubUIColor( "TitlePane.buttonHoverBackground", windowStyle ),
+			FlatUIUtils.getSubUIColor( "TitlePane.buttonPressedBackground", windowStyle ) );
 	}
 
-	public FlatWindowAbstractIcon( Dimension size, Color hoverBackground, Color pressedBackground ) {
+	/** @since 3.2 */
+	protected FlatWindowAbstractIcon( Dimension size, int symbolHeight, Color hoverBackground, Color pressedBackground ) {
 		super( size.width, size.height, null );
+		this.symbolHeight = symbolHeight;
 		this.hoverBackground = hoverBackground;
 		this.pressedBackground = pressedBackground;
 	}
@@ -66,7 +71,7 @@ public abstract class FlatWindowAbstractIcon
 	protected void paintBackground( Component c, Graphics2D g ) {
 		Color background = FlatButtonUI.buttonStateColor( c, null, null, null, hoverBackground, pressedBackground );
 		if( background != null ) {
-			// disable antialiasing for background rectangle painting to avoid blury edges when scaled (e.g. at 125% or 175%)
+			// disable antialiasing for background rectangle painting to avoid blurry edges when scaled (e.g. at 125% or 175%)
 			Object oldHint = g.getRenderingHint( RenderingHints.KEY_ANTIALIASING );
 			g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF );
 
@@ -80,4 +85,9 @@ public abstract class FlatWindowAbstractIcon
 	protected Color getForeground( Component c ) {
 		return c.getForeground();
 	}
+
+	/** @since 3.2 */
+	protected int getSymbolHeight() {
+		return symbolHeight;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowCloseIcon.java

@@ -21,8 +21,8 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
-import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatUIUtils;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -38,18 +38,27 @@ import com.formdev.flatlaf.util.SystemInfo;
 public class FlatWindowCloseIcon
 	extends FlatWindowAbstractIcon
 {
-	private final Color hoverForeground = UIManager.getColor( "TitlePane.closeHoverForeground" );
-	private final Color pressedForeground = UIManager.getColor( "TitlePane.closePressedForeground" );
+	private final Color hoverForeground;
+	private final Color pressedForeground;
 
 	public FlatWindowCloseIcon() {
-		super( UIManager.getDimension( "TitlePane.buttonSize" ),
-			UIManager.getColor( "TitlePane.closeHoverBackground" ),
-			UIManager.getColor( "TitlePane.closePressedBackground" ) );
+		this( null );
+	}
+
+	/** @since 3.2 */
+	public FlatWindowCloseIcon( String windowStyle ) {
+		super( FlatUIUtils.getSubUIDimension( "TitlePane.buttonSize", windowStyle ),
+			FlatUIUtils.getSubUIInt( "TitlePane.buttonSymbolHeight", windowStyle, 10 ),
+			FlatUIUtils.getSubUIColor( "TitlePane.closeHoverBackground", windowStyle ),
+			FlatUIUtils.getSubUIColor( "TitlePane.closePressedBackground", windowStyle ) );
+
+		hoverForeground = FlatUIUtils.getSubUIColor( "TitlePane.closeHoverForeground", windowStyle );
+		pressedForeground = FlatUIUtils.getSubUIColor( "TitlePane.closePressedForeground", windowStyle );
 	}
 
 	@Override
 	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
-		int iwh = (int) (10 * scaleFactor);
+		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
 		int ix2 = ix + iwh - 1;

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowIconifyIcon.java

@@ -27,11 +27,17 @@ public class FlatWindowIconifyIcon
 	extends FlatWindowAbstractIcon
 {
 	public FlatWindowIconifyIcon() {
+		this( null );
+	}
+
+	/** @since 3.2 */
+	public FlatWindowIconifyIcon( String windowStyle ) {
+		super( windowStyle );
 	}
 
 	@Override
 	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
-		int iw = (int) (10 * scaleFactor);
+		int iw = (int) (getSymbolHeight() * scaleFactor);
 		int ih = (int) scaleFactor;
 		int ix = x + ((width - iw) / 2);
 		int iy = y + ((height - ih) / 2);

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowMaximizeIcon.java

@@ -29,11 +29,17 @@ public class FlatWindowMaximizeIcon
 	extends FlatWindowAbstractIcon
 {
 	public FlatWindowMaximizeIcon() {
+		this( null );
+	}
+
+	/** @since 3.2 */
+	public FlatWindowMaximizeIcon( String windowStyle ) {
+		super( windowStyle );
 	}
 
 	@Override
 	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
-		int iwh = (int) (10 * scaleFactor);
+		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
 		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowRestoreIcon.java

@@ -32,18 +32,24 @@ public class FlatWindowRestoreIcon
 	extends FlatWindowAbstractIcon
 {
 	public FlatWindowRestoreIcon() {
+		this( null );
+	}
+
+	/** @since 3.2 */
+	public FlatWindowRestoreIcon( String windowStyle ) {
+		super( windowStyle );
 	}
 
 	@Override
 	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
-		int iwh = (int) (10 * scaleFactor);
+		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
 		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
 		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
 		int arcOuter = (int) (arc + (1.5 * scaleFactor));
 
-		int rwh = (int) (8 * scaleFactor);
+		int rwh = (int) ((getSymbolHeight() - 2) * scaleFactor);
 		int ro2 = iwh - rwh;
 
 		// upper-right rectangle

flatlaf-core/src/main/java/com/formdev/flatlaf/json/JsonParser.java

@@ -502,9 +502,9 @@ class JsonParser {
   }
 
   private boolean isHexDigit() {
-    return current >= '0' && current <= '9'
-        || current >= 'a' && current <= 'f'
-        || current >= 'A' && current <= 'F';
+    return (current >= '0' && current <= '9')
+        || (current >= 'a' && current <= 'f')
+        || (current >= 'A' && current <= 'F');
   }
 
   private boolean isEndOfText() {

flatlaf-core/src/main/java/com/formdev/flatlaf/json/Location.java

@@ -69,7 +69,7 @@ public class Location {
     if (obj == null) {
       return false;
     }
-    if (getClass() != obj.getClass()) {
+    if (!(obj instanceof Location)) {
       return false;
     }
     Location other = (Location)obj;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatBorder.java

@@ -28,7 +28,6 @@ import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JScrollPane;
 import javax.swing.JSpinner;
-import javax.swing.JViewport;
 import javax.swing.UIManager;
 import javax.swing.plaf.basic.BasicBorders;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -195,8 +194,7 @@ public class FlatBorder
 	protected boolean isEnabled( Component c ) {
 		if( c instanceof JScrollPane ) {
 			// check whether view component is disabled
-			JViewport viewport = ((JScrollPane)c).getViewport();
-			Component view = (viewport != null) ? viewport.getView() : null;
+			Component view = FlatScrollPaneUI.getView( (JScrollPane) c );
 			if( view != null && !isEnabled( view ) )
 				return false;
 		}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonUI.java

@@ -53,6 +53,8 @@ import javax.swing.plaf.ToolBarUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicButtonListener;
 import javax.swing.plaf.basic.BasicButtonUI;
+import javax.swing.plaf.basic.BasicHTML;
+import javax.swing.text.View;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.icons.FlatHelpButtonIcon;
@@ -362,6 +364,9 @@ public class FlatButtonUI
 			return ((FlatHelpButtonIcon)helpButtonIcon).applyStyleProperty( key, value );
 		}
 
+		if( "iconTextGap".equals( key ) && value instanceof Integer )
+			value = UIScale.scale( (Integer) value );
+
 		if( borderShared == null )
 			borderShared = new AtomicBoolean( true );
 		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, b, borderShared );
@@ -548,9 +553,45 @@ public class FlatButtonUI
 		}
 	}
 
+	/**
+	 * Similar to BasicButtonUI.paint(), but does not use zero insets for HTML text,
+	 * which is done in BasicButtonUI.layout() since Java 19.
+	 * See https://github.com/openjdk/jdk/pull/8407
+	 * and https://github.com/openjdk/jdk/pull/8407#issuecomment-1761583430
+	 */
 	@Override
 	public void paint( Graphics g, JComponent c ) {
-		super.paint( FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c ), c );
+		g = FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c );
+
+		AbstractButton b = (AbstractButton) c;
+
+		// layout
+		String clippedText = layout( b, b.getFontMetrics( b.getFont() ), b.getWidth(), b.getHeight() );
+
+		// not used in FlatLaf, but invoked for compatibility with BasicButtonUI.paint()
+		clearTextShiftOffset();
+
+		// not used in FlatLaf, but invoked for compatibility with BasicButtonUI.paint()
+		ButtonModel model = b.getModel();
+		if( model.isArmed() && model.isPressed() )
+			paintButtonPressed( g, b );
+
+		// paint icon
+		if( b.getIcon() != null )
+			paintIcon( g, b, iconR );
+
+		// paint text
+		if( clippedText != null && !clippedText.isEmpty() ) {
+			View view = (View) b.getClientProperty( BasicHTML.propertyKey );
+			if( view != null )
+				view.paint( g, textR ); // HTML text
+			else
+				paintText( g, b, textR, clippedText );
+		}
+
+		// not used in FlatLaf, but invoked for compatibility with BasicButtonUI.paint()
+		if( b.isFocusPainted() && b.hasFocus() )
+			paintFocus( g, b, viewR, textR, iconR );
 	}
 
 	@Override
@@ -680,14 +721,15 @@ public class FlatButtonUI
 	}
 
 	protected Color getForeground( JComponent c ) {
+		Color fg = c.getForeground();
 		boolean toolBarButton = isToolBarButton( c ) || isBorderlessButton( c );
 
 		// selected state
 		if( ((AbstractButton)c).isSelected() ) {
 			return buttonStateColor( c,
 				toolBarButton
-					? (toolbarSelectedForeground != null ? toolbarSelectedForeground : c.getForeground())
-					: selectedForeground,
+					? (toolbarSelectedForeground != null ? toolbarSelectedForeground : fg)
+					: (isCustomForeground( fg ) ? fg : selectedForeground),
 				toolBarButton
 					? (toolbarDisabledSelectedForeground != null ? toolbarDisabledSelectedForeground : disabledText)
 					: (disabledSelectedForeground != null ? disabledSelectedForeground : disabledText),
@@ -699,7 +741,7 @@ public class FlatButtonUI
 		// toolbar button
 		if( toolBarButton ) {
 			return buttonStateColor( c,
-				c.getForeground(),
+				fg,
 				disabledText,
 				null,
 				toolbarHoverForeground,
@@ -710,7 +752,7 @@ public class FlatButtonUI
 		return buttonStateColor( c,
 			getForegroundBase( c, def ),
 			disabledText,
-			isCustomForeground( c.getForeground() ) ? null : (def ? defaultFocusedForeground : focusedForeground),
+			isCustomForeground( fg ) ? null : (def ? defaultFocusedForeground : focusedForeground),
 			def ? defaultHoverForeground : hoverForeground,
 			def ? defaultPressedForeground : pressedForeground );
 	}
@@ -783,6 +825,67 @@ public class FlatButtonUI
 		return margin instanceof UIResource && Objects.equals( margin, defaultMargin );
 	}
 
+	@Override
+	public int getBaseline( JComponent c, int width, int height ) {
+		return getBaselineImpl( c, width, height );
+	}
+
+	/**
+	 * Similar to BasicButtonUI.getBaseline(), but does not use zero insets for HTML text,
+	 * which is done in BasicButtonUI.layout() since Java 19.
+	 * See https://github.com/openjdk/jdk/pull/8407
+	 * and https://github.com/openjdk/jdk/pull/8407#issuecomment-1761583430
+	 */
+	static int getBaselineImpl( JComponent c, int width, int height ) {
+		if( width < 0 || height < 0 )
+			throw new IllegalArgumentException();
+
+		AbstractButton b = (AbstractButton) c;
+		String text = b.getText();
+		if( text == null || text.isEmpty() )
+			return -1;
+
+		FontMetrics fm = b.getFontMetrics( b.getFont() );
+		layout( b, fm, width, height );
+
+		View view = (View) b.getClientProperty( BasicHTML.propertyKey );
+		if( view != null ) {
+			// HTML text
+			int baseline = BasicHTML.getHTMLBaseline( view, textR.width, textR.height );
+			return (baseline >= 0) ? textR.y + baseline : baseline;
+		} else
+			return textR.y + fm.getAscent();
+	}
+
+	/**
+	 * Similar to BasicButtonUI.layout(), but does not use zero insets for HTML text,
+	 * which is done in BasicButtonUI.layout() since Java 19.
+	 * See https://github.com/openjdk/jdk/pull/8407
+	 * and https://github.com/openjdk/jdk/pull/8407#issuecomment-1761583430
+	 */
+	private static String layout( AbstractButton b, FontMetrics fm, int width, int height ) {
+		// compute view rectangle
+		Insets insets = b.getInsets();
+		viewR.setBounds( insets.left, insets.top,
+			width - insets.left - insets.right,
+			height - insets.top - insets.bottom );
+
+		// reset rectangles
+		textR.setBounds( 0, 0, 0, 0 );
+		iconR.setBounds( 0, 0, 0, 0 );
+
+		String text = b.getText();
+		return SwingUtilities.layoutCompoundLabel( b, fm, text, b.getIcon(),
+			b.getVerticalAlignment(), b.getHorizontalAlignment(),
+			b.getVerticalTextPosition(), b.getHorizontalTextPosition(),
+			viewR, iconR, textR,
+			(text != null) ? b.getIconTextGap() : 0 );
+	}
+
+	private static Rectangle viewR = new Rectangle();
+	private static Rectangle textR = new Rectangle();
+	private static Rectangle iconR = new Rectangle();
+
 	//---- class FlatButtonListener -------------------------------------------
 
 	protected class FlatButtonListener

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java

@@ -256,10 +256,14 @@ public class FlatCaret
 		// select all
 		if( c instanceof JFormattedTextField ) {
 			EventQueue.invokeLater( () -> {
-				if( getComponent() == null )
+				// Warning: do not use variables from outside of this runnable
+				//          because they may be out-of-date when this runnable is executed
+
+				JTextComponent c2 = getComponent();
+				if( c2 == null )
 					return; // was deinstalled
 
-				select( 0, doc.getLength() );
+				select( 0, c2.getDocument().getLength() );
 			} );
 		} else {
 			select( 0, doc.getLength() );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java

@@ -24,6 +24,7 @@ import java.awt.Component;
 import java.awt.ComponentOrientation;
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.EventQueue;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
@@ -48,10 +49,12 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import javax.swing.AbstractAction;
 import javax.swing.BorderFactory;
 import javax.swing.CellRendererPane;
+import javax.swing.ComboBoxModel;
 import javax.swing.DefaultListCellRenderer;
 import javax.swing.InputMap;
 import javax.swing.JButton;
 import javax.swing.JComboBox;
+import javax.swing.JComboBox.KeySelectionManager;
 import javax.swing.JComponent;
 import javax.swing.JList;
 import javax.swing.JPanel;
@@ -102,7 +105,6 @@ import com.formdev.flatlaf.util.SystemInfo;
  * @uiDefault ComboBox.maximumRowCount			int
  * @uiDefault ComboBox.buttonStyle				String	auto (default), button, mac or none
  * @uiDefault Component.arrowType				String	chevron (default) or triangle
- * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault ComboBox.editableBackground		Color	optional; defaults to ComboBox.background
  * @uiDefault ComboBox.focusedBackground		Color	optional
  * @uiDefault ComboBox.disabledBackground		Color
@@ -134,7 +136,6 @@ public class FlatComboBoxUI
 	@Styleable protected int editorColumns;
 	@Styleable protected String buttonStyle;
 	@Styleable protected String arrowType;
-	protected boolean isIntelliJTheme;
 
 	private Color background;
 	@Styleable protected Color editableBackground;
@@ -182,6 +183,9 @@ public class FlatComboBoxUI
 	private void installUIImpl( JComponent c ) {
 		super.installUI( c );
 
+		// install key selection manager that shows popup when Space key is pressed
+		comboBox.setKeySelectionManager( new FlatKeySelectionManager( comboBox.getKeySelectionManager() ) );
+
 		installStyle();
 	}
 
@@ -240,7 +244,6 @@ public class FlatComboBoxUI
 		editorColumns = UIManager.getInt( "ComboBox.editorColumns" );
 		buttonStyle = UIManager.getString( "ComboBox.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 
 		background = UIManager.getColor( "ComboBox.background" );
 		editableBackground = UIManager.getColor( "ComboBox.editableBackground" );
@@ -679,7 +682,7 @@ public class FlatComboBoxUI
 
 			return (editableBackground != null && comboBox.isEditable()) ? editableBackground : background;
 		} else
-			return isIntelliJTheme ? FlatUIUtils.getParentBackground( comboBox ) : disabledBackground;
+			return disabledBackground;
 	}
 
 	protected Color getForeground( boolean enabled ) {
@@ -923,7 +926,7 @@ public class FlatComboBoxUI
 		protected void configurePopup() {
 			super.configurePopup();
 
-			// make opaque to avoid that background shines thru border (e.g. at 150% scaling)
+			// make opaque to avoid that background shines through border (e.g. at 150% scaling)
 			setOpaque( true );
 
 			// set popup border
@@ -941,7 +944,7 @@ public class FlatComboBoxUI
 			if( popupBackground != null )
 				list.setBackground( popupBackground );
 
-			// set popup background because it may shine thru when scaled (e.g. at 150%)
+			// set popup background because it may shine through when scaled (e.g. at 150%)
 			// use non-UIResource to avoid that it is overwritten when making
 			// popup visible (see JPopupMenu.setInvoker()) in theme editor preview
 			setBackground( FlatUIUtils.nonUIResource( list.getBackground() ) );
@@ -986,6 +989,29 @@ public class FlatComboBoxUI
 				}
 			}
 
+			// improve location of selected item in popup if list is large and scrollable
+			if( list.getHeight() == 0 ) {
+				// If popup is shown for the first time (or after a laf switch) and is scrollable,
+				// then BasicComboPopup scrolls the selected item to the top of the visible area.
+				// But for usability it would be better to have selected item somewhere
+				// in the middle of the visible area so that the user can see items above
+				// the selected item, which are usually more "important".
+
+				int selectedIndex = list.getSelectedIndex();
+				if( selectedIndex >= 1 ) {
+					int maximumRowCount = comboBox.getMaximumRowCount();
+					if( selectedIndex < maximumRowCount ) {
+						// selected item is in the first visible items --> scroll to top
+						list.scrollRectToVisible( new Rectangle() );
+					} else {
+						// scroll the selected item to the middle of the visible area
+						int firstVisibleIndex = Math.max( selectedIndex - (maximumRowCount / 2), 0 );
+						if( firstVisibleIndex > 0 )
+							list.ensureIndexIsVisible( firstVisibleIndex );
+					}
+				}
+			}
+
 			super.show( invoker, x, y );
 		}
 
@@ -1064,7 +1090,7 @@ public class FlatComboBoxUI
 		}
 
 		// using synchronized to avoid problems with code that modifies combo box
-		// (model, selection, etc) not on AWT thread (which should be not done)
+		// (model, selection, etc.) not on AWT thread (which should be not done)
 		synchronized void install( Component c, int focusWidth ) {
 			if( !(c instanceof JComponent) )
 				return;
@@ -1209,4 +1235,46 @@ public class FlatComboBoxUI
 			}
 		}
 	}
+
+	//---- class FlatKeySelectionManager --------------------------------------
+
+	/**
+	 * Key selection manager that delegates to the default manager.
+	 * Shows the popup if Space key is pressed and "typed characters" buffer is empty.
+	 * If items contain spaces (e.g. "a b") it is still possible to select them
+	 * by pressing keys 'a', 'Space' and 'b'.
+	 */
+	private class FlatKeySelectionManager
+		implements JComboBox.KeySelectionManager, UIResource
+	{
+		private final KeySelectionManager delegate;
+		private final long timeFactor;
+		private long lastTime;
+
+		FlatKeySelectionManager( JComboBox.KeySelectionManager delegate ) {
+			this.delegate = delegate;
+
+			Long value = (Long) UIManager.get( "ComboBox.timeFactor" );
+			timeFactor = (value != null) ? value : 1000;
+		}
+
+		@SuppressWarnings( "rawtypes" )
+		@Override
+		public int selectionForKey( char aKey, ComboBoxModel aModel ) {
+			long time = EventQueue.getMostRecentEventTime();
+			long oldLastTime = lastTime;
+			lastTime = time;
+
+			// SPACE key shows popup if not yet visible
+			if( aKey == ' ' &&
+				time - oldLastTime >= timeFactor &&
+				!comboBox.isPopupVisible() )
+			{
+				comboBox.setPopupVisible( true );
+				return -1;
+			}
+
+			return delegate.selectionForKey( aKey, aModel );
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatEditorPaneUI.java

@@ -59,7 +59,6 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * <!-- FlatEditorPaneUI -->
  *
  * @uiDefault Component.minimumWidth			int
- * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault EditorPane.focusedBackground		Color	optional
  *
  * @author Karl Tauber
@@ -69,7 +68,6 @@ public class FlatEditorPaneUI
 	implements StyleableUI
 {
 	@Styleable protected int minimumWidth;
-	protected boolean isIntelliJTheme;
 	private Color background;
 	@Styleable protected Color disabledBackground;
 	@Styleable protected Color inactiveBackground;
@@ -101,7 +99,6 @@ public class FlatEditorPaneUI
 
 		String prefix = getPropertyPrefix();
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		background = UIManager.getColor( prefix + ".background" );
 		disabledBackground = UIManager.getColor( prefix + ".disabledBackground" );
 		inactiveBackground = UIManager.getColor( prefix + ".inactiveBackground" );
@@ -252,11 +249,11 @@ public class FlatEditorPaneUI
 
 	@Override
 	protected void paintBackground( Graphics g ) {
-		paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
+		paintBackground( g, getComponent(), focusedBackground );
 	}
 
-	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme, Color focusedBackground ) {
-		g.setColor( FlatTextFieldUI.getBackground( c, isIntelliJTheme, focusedBackground ) );
+	static void paintBackground( Graphics g, JTextComponent c, Color focusedBackground ) {
+		g.setColor( FlatTextFieldUI.getBackground( c, focusedBackground ) );
 		g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFileChooserUI.java

@@ -29,6 +29,7 @@ import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.File;
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.function.Function;
 import javax.swing.AbstractButton;
 import javax.swing.Box;
@@ -53,6 +54,7 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.metal.MetalFileChooserUI;
 import javax.swing.table.TableCellRenderer;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.icons.FlatFileViewDirectoryIcon;
 import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.ScaledImageIcon;
 import com.formdev.flatlaf.util.SystemInfo;
@@ -346,12 +348,12 @@ public class FlatFileChooserUI
 			fileView.clearIconCache();
 	}
 
-	private boolean doNotUseSystemIcons() {
+	private static boolean doNotUseSystemIcons() {
 		// Java 17 32bit craches on Windows when using system icons
-		// fixed in Java 18+ (see https://bugs.openjdk.java.net/browse/JDK-8277299)
+		// fixed in Java 18+, fix backported in Java 17.0.3+ (see https://bugs.openjdk.java.net/browse/JDK-8277299)
 		return SystemInfo.isWindows &&
 			SystemInfo.isX86 &&
-			(SystemInfo.isJava_17_orLater && !SystemInfo.isJava_18_orLater);
+			(SystemInfo.isJava_17_orLater && SystemInfo.javaVersion < SystemInfo.toVersion( 17, 0, 3, 0 ));
 	}
 
 	//---- class FlatFileView -------------------------------------------------
@@ -368,7 +370,11 @@ public class FlatFileChooserUI
 
 			// get system icon
 			if( f != null ) {
-				icon = getFileChooser().getFileSystemView().getSystemIcon( f );
+				try {
+					icon = getFileChooser().getFileSystemView().getSystemIcon( f );
+				} catch( NullPointerException ex ) {
+					// Java 21 may throw a NPE for exe files that use default Windows exe icon
+				}
 
 				if( icon != null ) {
 					if( icon instanceof ImageIcon )
@@ -407,7 +413,7 @@ public class FlatFileChooserUI
 
 		protected final File[] files;
 		protected final JToggleButton[] buttons;
-		protected final ButtonGroup buttonGroup;
+		protected final ButtonGroup buttonGroup = new ButtonGroup();
 
 		@SuppressWarnings( "unchecked" )
 		public FlatShortcutsPanel( JFileChooser fc ) {
@@ -423,22 +429,25 @@ public class FlatFileChooserUI
 			iconFunction = (Function<File, Icon>) UIManager.get( "FileChooser.shortcuts.iconFunction" );
 
 			FileSystemView fsv = fc.getFileSystemView();
-			File[] files = getChooserShortcutPanelFiles( fsv );
+			File[] files = JavaCompatibility2.getChooserShortcutPanelFiles( fsv );
 			if( filesFunction != null )
 				files = filesFunction.apply( files );
-			this.files = files;
 
 			// create toolbar buttons
-			buttons = new JToggleButton[files.length];
-			buttonGroup = new ButtonGroup();
-			for( int i = 0; i < files.length; i++ ) {
-				// wrap drive path
-				if( fsv.isFileSystemRoot( files[i] ) )
-					files[i] = fsv.createFileObject( files[i].getAbsolutePath() );
+			ArrayList<File> filesList = new ArrayList<>();
+			ArrayList<JToggleButton> buttonsList = new ArrayList<>();
+			for( File file : files ) {
+				if( file == null )
+					continue;
+
+				// wrap drive path
+				if( fsv.isFileSystemRoot( file ) )
+					file = fsv.createFileObject( file.getAbsolutePath() );
 
-				File file = files[i];
 				String name = getDisplayName( fsv, file );
 				Icon icon = getIcon( fsv, file );
+				if( name == null )
+					continue;
 
 				// remove path from name
 				int lastSepIndex = name.lastIndexOf( File.separatorChar );
@@ -453,15 +462,21 @@ public class FlatFileChooserUI
 
 				// create button
 				JToggleButton button = createButton( name, icon );
+				File f = file;
 				button.addActionListener( e -> {
-					fc.setCurrentDirectory( file );
+					fc.setCurrentDirectory( f );
 				} );
 
 				add( button );
 				buttonGroup.add( button );
-				buttons[i] = button;
+
+				filesList.add( file );
+				buttonsList.add( button );
 			}
 
+			this.files = filesList.toArray( new File[filesList.size()] );
+			this.buttons = buttonsList.toArray( new JToggleButton[buttonsList.size()] );
+
 			directoryChanged( fc.getCurrentDirectory() );
 		}
 
@@ -483,32 +498,6 @@ public class FlatFileChooserUI
 			return button;
 		}
 
-		protected File[] getChooserShortcutPanelFiles( FileSystemView fsv ) {
-			try {
-				if( SystemInfo.isJava_12_orLater ) {
-					Method m = fsv.getClass().getMethod( "getChooserShortcutPanelFiles" );
-					File[] files = (File[]) m.invoke( fsv );
-
-					// on macOS and Linux, files consists only of the user home directory
-					if( files.length == 1 && files[0].equals( new File( System.getProperty( "user.home" ) ) ) )
-						files = new File[0];
-
-					return files;
-				} else if( SystemInfo.isWindows ) {
-					Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
-					Method m = cls.getMethod( "get", String.class );
-					return (File[]) m.invoke( null, "fileChooserShortcutPanelFolders" );
-				}
-			} catch( IllegalAccessException ex ) {
-				// do not log because access may be denied via VM option '--illegal-access=deny'
-			} catch( Exception ex ) {
-				LoggingFacade.INSTANCE.logSevere( null, ex );
-			}
-
-			// fallback
-			return new File[0];
-		}
-
 		protected String getDisplayName( FileSystemView fsv, File file ) {
 			if( displayNameFunction != null ) {
 				String name = displayNameFunction.apply( file );
@@ -526,29 +515,39 @@ public class FlatFileChooserUI
 					return icon;
 			}
 
-			// Java 17+ supports getting larger system icons
-			try {
-				if( SystemInfo.isJava_17_orLater ) {
-					Method m = fsv.getClass().getMethod( "getSystemIcon", File.class, int.class, int.class );
-					return (Icon) m.invoke( fsv, file, iconSize.width, iconSize.height );
-				} else if( iconSize.width > 16 || iconSize.height > 16 ) {
-					Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
-					if( cls.isInstance( file ) ) {
-						Method m = file.getClass().getMethod( "getIcon", boolean.class );
-						m.setAccessible( true );
-						Image image = (Image) m.invoke( file, true );
-						if( image != null )
-							return new ImageIcon( image );
-					}
-				}
-			} catch( IllegalAccessException ex ) {
-				// do not log because access may be denied via VM option '--illegal-access=deny'
-			} catch( Exception ex ) {
-				LoggingFacade.INSTANCE.logSevere( null, ex );
-			}
+			if( doNotUseSystemIcons() )
+				return new FlatFileViewDirectoryIcon();
 
-			// get system icon in default size 16x16
-			return fsv.getSystemIcon( file );
+			try {
+				// Java 17+ supports getting larger system icons
+				try {
+					if( SystemInfo.isJava_17_orLater ) {
+						Method m = fsv.getClass().getMethod( "getSystemIcon", File.class, int.class, int.class );
+						return (Icon) m.invoke( fsv, file, iconSize.width, iconSize.height );
+					} else if( iconSize.width > 16 || iconSize.height > 16 ) {
+						Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
+						if( cls.isInstance( file ) ) {
+							Method m = file.getClass().getMethod( "getIcon", boolean.class );
+							m.setAccessible( true );
+							Image image = (Image) m.invoke( file, true );
+							if( image != null )
+								return new ImageIcon( image );
+						}
+					}
+				} catch( Exception ex ) {
+					// do not log InaccessibleObjectException because access
+					// may be denied via VM option '--illegal-access=deny' (default in Java 16)
+					// (not catching InaccessibleObjectException here because it is new in Java 9, but FlatLaf also runs on Java 8)
+					if( !"java.lang.reflect.InaccessibleObjectException".equals( ex.getClass().getName() ) )
+						LoggingFacade.INSTANCE.logSevere( null, ex );
+				}
+
+				// get system icon in default size 16x16
+				return fsv.getSystemIcon( file );
+			} catch( NullPointerException ex ) {
+				// Java 21 may throw a NPE for exe files that use default Windows exe icon
+				return new FlatFileViewDirectoryIcon();
+			}
 		}
 
 		protected void directoryChanged( File file ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFormattedTextFieldUI.java

@@ -40,7 +40,6 @@ import javax.swing.plaf.ComponentUI;
  * <!-- FlatTextFieldUI -->
  *
  * @uiDefault Component.minimumWidth					int
- * @uiDefault Component.isIntelliJTheme					boolean
  * @uiDefault FormattedTextField.placeholderForeground	Color
  * @uiDefault FormattedTextField.focusedBackground		Color	optional
  * @uiDefault FormattedTextField.iconTextGap			int		optional, default is 4

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLabelUI.java

@@ -24,6 +24,7 @@ import java.awt.Rectangle;
 import java.beans.PropertyChangeEvent;
 import java.util.Arrays;
 import java.util.HashSet;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import javax.swing.Icon;
@@ -179,7 +180,7 @@ public class FlatLabelUI
 			// BASE_SIZE rule is parsed in javax.swing.text.html.StyleSheet.addRule()
 			String style = "<style>BASE_SIZE " + c.getFont().getSize() + "</style>";
 
-			String lowerText = text.toLowerCase();
+			String lowerText = text.toLowerCase( Locale.ENGLISH );
 			int headIndex;
 			int styleIndex;
 
@@ -228,7 +229,7 @@ public class FlatLabelUI
 						int tagBegin = i + 1;
 						for( i += 2; i < textLength; i++ ) {
 							if( !Character.isLetterOrDigit( text.charAt( i ) ) ) {
-								String tag = text.substring( tagBegin, i ).toLowerCase();
+								String tag = text.substring( tagBegin, i ).toLowerCase( Locale.ENGLISH );
 								if( tagsUseFontSizeSet.contains( tag ) )
 									return true;
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java

@@ -22,6 +22,7 @@ import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import javax.swing.JComponent;
 
 /**
  * Line border for various components.
@@ -66,6 +67,9 @@ public class FlatLineBorder
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+		if( c instanceof JComponent && ((JComponent)c).getClientProperty( FlatPopupFactory.KEY_POPUP_USES_NATIVE_BORDER ) != null )
+			return;
+
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
 			FlatUIUtils.setRenderingHints( g2 );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatListUI.java

@@ -301,7 +301,8 @@ public class FlatListUI
 		// get renderer component
 		@SuppressWarnings( "unchecked" )
 		Component rendererComponent = cellRenderer.getListCellRendererComponent( list,
-			dataModel.getElementAt( row ), row, isSelected, list.hasFocus() && (row == leadIndex) );
+			dataModel.getElementAt( row ), row, isSelected,
+			FlatUIUtils.isPermanentFocusOwner( list ) && (row == leadIndex) );
 
 		//
 		boolean isFileList = Boolean.TRUE.equals( list.getClientProperty( "List.isFileList" ) );
@@ -410,7 +411,7 @@ public class FlatListUI
 				int leftIndex = locationToIndex( list, new Point( r.x - 1, r.y ) );
 				int rightIndex = locationToIndex( list, new Point( r.x + r.width, r.y ) );
 
-				// special handling for the case that last column contains less cells than the other columns
+				// special handling for the case that last column contains fewer cells than the other columns
 				boolean ltr = list.getComponentOrientation().isLeftToRight();
 				if( !ltr && leftIndex >= 0 && leftIndex != row && leftIndex == locationToIndex( list, new Point( r.x - 1, r.y - 1 ) ) )
 					leftIndex = -1;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java

@@ -27,7 +27,6 @@ import java.awt.event.ActionEvent;
 import java.beans.PropertyChangeListener;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicBoolean;
-import javax.swing.AbstractAction;
 import javax.swing.ActionMap;
 import javax.swing.BoxLayout;
 import javax.swing.JComponent;
@@ -39,7 +38,6 @@ import javax.swing.MenuElement;
 import javax.swing.MenuSelectionManager;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
-import javax.swing.plaf.ActionMapUIResource;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicMenuBarUI;
@@ -144,12 +142,10 @@ public class FlatMenuBarUI
 	protected void installKeyboardActions() {
 		super.installKeyboardActions();
 
+		// get shared action map, used for all menu bars
 		ActionMap map = SwingUtilities.getUIActionMap( menuBar );
-		if( map == null ) {
-			map = new ActionMapUIResource();
-			SwingUtilities.replaceUIActionMap( menuBar, map );
-		}
-		map.put( "takeFocus", new TakeFocus() );
+		if( map != null && !(map.get( "takeFocus" ) instanceof TakeFocusAction) )
+			map.put( "takeFocus", new TakeFocusAction( "takeFocus" ) );
 	}
 
 	/** @since 2 */
@@ -365,16 +361,20 @@ public class FlatMenuBarUI
 		}
 	}
 
-	//---- class TakeFocus ----------------------------------------------------
+	//---- class TakeFocusAction ----------------------------------------------
 
 	/**
 	 * Activates the menu bar and shows mnemonics.
 	 * On Windows, the popup of the first menu is not shown.
 	 * On other platforms, the popup of the first menu is shown.
 	 */
-	private static class TakeFocus
-		extends AbstractAction
+	private static class TakeFocusAction
+		extends FlatUIAction
 	{
+		TakeFocusAction( String name ) {
+			super( name );
+		}
+
 		@Override
 		public void actionPerformed( ActionEvent e ) {
 			JMenuBar menuBar = (JMenuBar) e.getSource();

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemRenderer.java

@@ -456,10 +456,11 @@ debug*/
 			return;
 
 		// center because the real icon may be smaller than dimension in iconRect
+		int x = iconRect.x + centerOffset( iconRect.width, icon.getIconWidth() );
 		int y = iconRect.y + centerOffset( iconRect.height, icon.getIconHeight() );
 
 		// paint
-		icon.paintIcon( menuItem, g, iconRect.x, y );
+		icon.paintIcon( menuItem, g, x, y );
 	}
 
 	protected static void paintText( Graphics g, JMenuItem menuItem,

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuUI.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.Graphics;
@@ -271,7 +272,7 @@ public class FlatMenuUI
 				if( !isHover() )
 					selectionBackground = getStyleFromMenuBarUI( ui -> ui.selectionBackground, menuBarSelectionBackground, selectionBackground );
 
-				JMenuBar menuBar = (JMenuBar) menuItem.getParent();
+				Container menuBar = menuItem.getParent();
 				JRootPane rootPane = SwingUtilities.getRootPane( menuBar );
 				if( rootPane != null && rootPane.getParent() instanceof Window &&
 					rootPane.getJMenuBar() == menuBar &&
@@ -321,12 +322,17 @@ public class FlatMenuUI
 		}
 
 		private <T> T getStyleFromMenuBarUI( Function<FlatMenuBarUI, T> f, T defaultValue ) {
-			MenuBarUI ui = ((JMenuBar)menuItem.getParent()).getUI();
-			if( !(ui instanceof FlatMenuBarUI) )
-				return defaultValue;
-
-			T value = f.apply( (FlatMenuBarUI) ui );
-			return (value != null) ? value : defaultValue;
+			Container menuItemParent = menuItem.getParent();
+			if( menuItemParent instanceof JMenuBar ) {
+				MenuBarUI ui = ((JMenuBar) menuItemParent).getUI();
+				if( ui instanceof FlatMenuBarUI ) {
+					T value = f.apply( (FlatMenuBarUI) ui );
+					if( value != null ) {
+						return value;
+					}
+				}
+			}
+			return defaultValue;
 		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeLibrary.java

@@ -17,9 +17,12 @@
 package com.formdev.flatlaf.ui;
 
 import java.io.File;
+import java.net.URL;
+import java.security.CodeSource;
 import com.formdev.flatlaf.FlatSystemProperties;
 import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.NativeLibrary;
+import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -31,40 +34,67 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 class FlatNativeLibrary
 {
+	private static boolean initialized;
 	private static NativeLibrary nativeLibrary;
 
+	private native static int getApiVersion();
+
 	/**
 	 * Loads native library (if available) and returns whether loaded successfully.
 	 * Returns {@code false} if no native library is available.
 	 */
-	static synchronized boolean isLoaded() {
-		initialize();
+	static synchronized boolean isLoaded( int apiVersion ) {
+		initialize( apiVersion );
 		return (nativeLibrary != null) ? nativeLibrary.isLoaded() : false;
 	}
 
-	private static void initialize() {
-		if( nativeLibrary != null )
+	private static void initialize( int apiVersion ) {
+		if( initialized )
+			return;
+		initialized = true;
+
+		if( !FlatSystemProperties.getBoolean( FlatSystemProperties.USE_NATIVE_LIBRARY, true ) )
 			return;
 
-		String libraryName;
-		if( SystemInfo.isWindows_10_orLater && (SystemInfo.isX86 || SystemInfo.isX86_64) ) {
-			// Windows: requires Windows 10/11 (x86 or x86_64)
+		String classifier;
+		String ext;
+		if( SystemInfo.isWindows_10_orLater && (SystemInfo.isX86 || SystemInfo.isX86_64 || SystemInfo.isAARCH64) ) {
+			// Windows: requires Windows 10/11 (x86, x86_64 or aarch64)
 
-			libraryName = "flatlaf-windows-x86";
-			if( SystemInfo.isX86_64 )
-				libraryName += "_64";
+			if( SystemInfo.isAARCH64 )
+				classifier = "windows-arm64";
+			else if( SystemInfo.isX86_64 )
+				classifier = "windows-x86_64";
+			else
+				classifier = "windows-x86";
+
+			ext = "dll";
+
+			// Do not load jawt.dll (part of JRE) here explicitly because
+			// the FlatLaf native library flatlaf.dll may be loaded very early on Windows
+			// (e.g. from class com.formdev.flatlaf.util.SystemInfo) and before AWT is
+			// initialized (and awt.dll is loaded). Loading jawt.dll also loads awt.dll.
+			// In Java 8, loading jawt.dll before AWT is initialized may load
+			// a wrong version of awt.dll if a newer Java version (e.g. 19)
+			// is in PATH environment variable. Then Java 19 awt.dll and Java 8 awt.dll
+			// are loaded at same time and calling JAWT_GetAWT() crashes the application.
+			//
+			// To avoid this, flatlaf.dll is not linked to jawt.dll,
+			// which avoids loading jawt.dll when flatlaf.dll is loaded.
+			// Instead, flatlaf.dll dynamically loads jawt.dll when first used,
+			// which is guaranteed after AWT initialization.
+
+		} else if( SystemInfo.isMacOS_10_14_Mojave_orLater && (SystemInfo.isAARCH64 || SystemInfo.isX86_64) ) {
+			// macOS: requires macOS 10.14 or later (arm64 or x86_64)
+
+			classifier = SystemInfo.isAARCH64 ? "macos-arm64" : "macos-x86_64";
+			ext = "dylib";
 
-			// In Java 8, load jawt.dll (part of JRE) explicitly because it
-			// is not found when running application with <jdk>/bin/java.exe.
-			// When using <jdk>/jre/bin/java.exe, it is found.
-			// jawt.dll is located in <jdk>/jre/bin/.
-			// Java 9 and later do not have this problem,
-			// but load jawt.dll anyway to be on the safe side.
-			loadJAWT();
 		} else if( SystemInfo.isLinux && SystemInfo.isX86_64 ) {
 			// Linux: requires x86_64
 
-			libraryName = "flatlaf-linux-x86_64";
+			classifier = "linux-x86_64";
+			ext = "so";
 
 			// Load libjawt.so (part of JRE) explicitly because it is not found
 			// in all Java versions/distributions.
@@ -76,10 +106,32 @@ class FlatNativeLibrary
 			return; // no native library available for current OS or CPU architecture
 
 		// load native library
-		nativeLibrary = createNativeLibrary( libraryName );
+		NativeLibrary nativeLibrary = createNativeLibrary( classifier, ext );
+		if( !nativeLibrary.isLoaded() )
+			return;
+
+		// check API version (and check whether library works)
+		try {
+			int actualApiVersion = getApiVersion();
+			if( actualApiVersion != apiVersion ) {
+				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Wrong API version in native library (expected "
+					+ apiVersion + ", actual " + actualApiVersion + "). Ignoring native library.", null );
+				return;
+			}
+		} catch( Throwable ex ) {
+			// could be a UnsatisfiedLinkError in case that loading native library
+			// from temp directory was blocked by some OS security mechanism
+			LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to get API version of native library. Ignoring native library.", ex );
+			return;
+		}
+
+		FlatNativeLibrary.nativeLibrary = nativeLibrary;
 	}
 
-	private static NativeLibrary createNativeLibrary( String libraryName ) {
+	private static NativeLibrary createNativeLibrary( String classifier, String ext ) {
+		String libraryName = "flatlaf-" + classifier;
+
+		// load from "java.library.path" or from path specified in system property "flatlaf.nativeLibraryPath"
 		String libraryPath = System.getProperty( FlatSystemProperties.NATIVE_LIBRARY_PATH );
 		if( libraryPath != null ) {
 			if( "system".equals( libraryPath ) ) {
@@ -87,19 +139,140 @@ class FlatNativeLibrary
 				if( library.isLoaded() )
 					return library;
 
-				LoggingFacade.INSTANCE.logSevere( "Did not find library " + libraryName + " in java.library.path, using extracted library instead", null );
+				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Native library '" + System.mapLibraryName( libraryName )
+					+ "' not found in java.library.path '" + System.getProperty( "java.library.path" )
+					+ "'. Using extracted native library instead.", null );
 			} else {
+				// try standard library naming scheme
+				// (same as in flatlaf.jar in package 'com/formdev/flatlaf/natives')
 				File libraryFile = new File( libraryPath, System.mapLibraryName( libraryName ) );
 				if( libraryFile.exists() )
 					return new NativeLibrary( libraryFile, true );
 
-				LoggingFacade.INSTANCE.logSevere( "Did not find external library " + libraryFile + ", using extracted library instead", null );
+				// try Maven naming scheme
+				// (see https://www.formdev.com/flatlaf/native-libraries/)
+				String libraryName2 = null;
+				File jarFile = getJarFile();
+				if( jarFile != null ) {
+					libraryName2 = buildLibraryName( jarFile, classifier, ext );
+					File libraryFile2 = new File( libraryPath, libraryName2 );
+					if( libraryFile2.exists() )
+						return new NativeLibrary( libraryFile2, true );
+				}
+
+				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Native library '"
+					+ libraryFile.getName()
+					+ (libraryName2 != null ? ("' or '" + libraryName2) : "")
+					+ "' not found in '" + libraryFile.getParentFile().getAbsolutePath()
+					+ "'. Using extracted native library instead.", null );
 			}
 		}
 
+		// load from beside the FlatLaf jar
+		// e.g. for flatlaf-3.1.jar, load flatlaf-3.1-windows-x86_64.dll (from same directory)
+		File libraryFile = findLibraryBesideJar( classifier, ext );
+		if( libraryFile != null )
+			return new NativeLibrary( libraryFile, true );
+
+		// load from FlatLaf jar (extract native library to temp folder)
 		return new NativeLibrary( "com/formdev/flatlaf/natives/" + libraryName, null, true );
 	}
 
+	/**
+	 * Search for a native library beside the jar that contains this class
+	 * (usually the FlatLaf jar).
+	 * The native library must be in the same directory (or in "../bin" if jar is in "lib")
+	 * as the jar and have the same basename as the jar.
+	 * If FlatLaf jar is repackaged into fat/uber application jar, "-flatlaf" is appended to jar basename.
+	 * The classifier and the extension are appended to the jar basename.
+	 *
+	 * E.g.
+	 *     flatlaf-3.1.jar
+	 *     flatlaf-3.1-windows-x86_64.dll
+	 *     flatlaf-3.1-linux-x86_64.so
+	 */
+	private static File findLibraryBesideJar( String classifier, String ext ) {
+		// get location of FlatLaf jar (or fat/uber application jar)
+		File jarFile = getJarFile();
+		if( jarFile == null )
+			return null;
+
+		// build library file
+		String libraryName = buildLibraryName( jarFile, classifier, ext );
+		File jarDir = jarFile.getParentFile();
+
+		// check whether native library exists in same directory as jar
+		File libraryFile = new File( jarDir, libraryName );
+		if( libraryFile.isFile() )
+			return libraryFile;
+
+		// if jar is in "lib" directory, then also check whether native library exists
+		// in "../bin" directory
+		if( jarDir.getName().equalsIgnoreCase( "lib" ) ) {
+			libraryFile = new File( jarDir.getParentFile(), "bin/" + libraryName );
+			if( libraryFile.isFile() )
+				return libraryFile;
+		}
+
+		// special case: support Gradle cache when running in development environment
+		//   <user-home>/.gradle/caches/modules-2/files-2.1/com.formdev/flatlaf/<version>/<hash-1>/flatlaf-<version>.jar
+		//   <user-home>/.gradle/caches/modules-2/files-2.1/com.formdev/flatlaf/<version>/<hash-2>/flatlaf-<version>-windows-x86_64.dll
+		String path = jarDir.getAbsolutePath().replace( '\\', '/' );
+		if( path.contains( "/.gradle/caches/" ) ) {
+			File versionDir = jarDir.getParentFile();
+			if( libraryName.contains( versionDir.getName() ) ) {
+				File[] dirs = versionDir.listFiles();
+				if( dirs != null ) {
+					for( File dir : dirs ) {
+						libraryFile = new File( dir, libraryName );
+						if( libraryFile.isFile() )
+							return libraryFile;
+					}
+				}
+			}
+		}
+
+		// native library not found
+		return null;
+	}
+
+	private static File getJarFile() {
+		try {
+			// get location of FlatLaf jar
+			CodeSource codeSource = FlatNativeLibrary.class.getProtectionDomain().getCodeSource();
+			URL jarUrl = (codeSource != null) ? codeSource.getLocation() : null;
+			if( jarUrl == null )
+				return null;
+
+			// if url is not a file, then we're running in a special environment (e.g. WebStart)
+			if( !"file".equals( jarUrl.getProtocol() ) )
+				return null;
+
+			File jarFile = new File( jarUrl.toURI() );
+
+			// if jarFile is a directory, then we're in a development environment
+			if( !jarFile.isFile() )
+				return null;
+
+			return jarFile;
+		} catch( Exception ex ) {
+			LoggingFacade.INSTANCE.logSevere( ex.getMessage(), ex );
+			return null;
+		}
+	}
+
+	private static String buildLibraryName( File jarFile, String classifier, String ext ) {
+		String jarName = jarFile.getName();
+		String jarBasename = jarName.substring( 0, jarName.lastIndexOf( '.' ) );
+
+		// remove classifier "no-natives" (if used)
+		jarBasename = StringUtils.removeTrailing( jarBasename, "-no-natives" );
+
+		return jarBasename
+			+ (jarBasename.contains( "flatlaf" ) ? "" : "-flatlaf")
+			+ '-' + classifier + '.' + ext;
+	}
+
 	private static void loadJAWT() {
 		try {
 			System.loadLibrary( "jawt" );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeLinuxLibrary.java

@@ -23,6 +23,7 @@ import java.awt.event.MouseEvent;
 import java.awt.geom.AffineTransform;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * Native methods for Linux.
@@ -34,8 +35,16 @@ import javax.swing.JFrame;
  */
 class FlatNativeLinuxLibrary
 {
+	private static int API_VERSION_LINUX = 3001;
+
+	/**
+	 * Checks whether native library is loaded/available.
+	 * <p>
+	 * <b>Note</b>: It is required to invoke this method before invoking any other
+	 *              method of this class. Otherwise, the native library may not be loaded.
+	 */
 	static boolean isLoaded() {
-		return FlatNativeLibrary.isLoaded();
+		return SystemInfo.isLinux && FlatNativeLibrary.isLoaded( API_VERSION_LINUX );
 	}
 
 	// direction for _NET_WM_MOVERESIZE message

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeMacLibrary.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2023 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Rectangle;
+import java.awt.Window;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Native methods for macOS.
+ * <p>
+ * <b>Note</b>: This is private API. Do not use!
+ *
+ * <h2>Methods that use windows as parameter</h2>
+ *
+ * For all methods that accept a {@link java.awt.Window} as parameter,
+ * the underlying macOS window must be already created,
+ * otherwise the method fails. You can use following to ensure this:
+ * <pre>{@code
+ * if( !window.isDisplayable() )
+ *     window.addNotify();
+ * }</pre>
+ * or invoke the method after packing the window. E.g.
+ * <pre>{@code
+ * window.pack();
+ * }</pre>
+ *
+ * @author Karl Tauber
+ * @since 3.3
+ */
+public class FlatNativeMacLibrary
+{
+	private static int API_VERSION_MACOS = 2001;
+
+	/**
+	 * Checks whether native library is loaded/available.
+	 * <p>
+	 * <b>Note</b>: It is required to invoke this method before invoking any other
+	 *              method of this class. Otherwise, the native library may not be loaded.
+	 */
+	public static boolean isLoaded() {
+		return SystemInfo.isMacOS && FlatNativeLibrary.isLoaded( API_VERSION_MACOS );
+	}
+
+	public native static boolean setWindowRoundedBorder( Window window, float radius, float borderWidth, int borderColor );
+
+	/** @since 3.4 */
+	public static final int
+		BUTTONS_SPACING_DEFAULT = 0,
+		BUTTONS_SPACING_MEDIUM = 1,
+		BUTTONS_SPACING_LARGE = 2;
+
+	/** @since 3.4 */ public native static boolean setWindowButtonsSpacing( Window window, int buttonsSpacing );
+	/** @since 3.4 */ public native static Rectangle getWindowButtonsBounds( Window window );
+	/** @since 3.4 */ public native static boolean isWindowFullScreen( Window window );
+	/** @since 3.4 */ public native static boolean toggleWindowFullScreen( Window window );
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeWindowBorder.java

@@ -17,20 +17,27 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Component;
 import java.awt.Container;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Point;
 import java.awt.Rectangle;
+import java.awt.Toolkit;
 import java.awt.Window;
 import java.beans.PropertyChangeListener;
-import java.util.List;
+import java.util.function.Predicate;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.JRootPane;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.event.ChangeListener;
+import javax.swing.plaf.BorderUIResource;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatSystemProperties;
-import com.formdev.flatlaf.ui.JBRCustomDecorations.JBRWindowTopBorder;
+import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -54,27 +61,15 @@ public class FlatNativeWindowBorder
 		!SystemInfo.isWinPE &&
 		FlatSystemProperties.getBoolean( FlatSystemProperties.USE_WINDOW_DECORATIONS, true );
 
-	// check this field before using class JBRCustomDecorations to avoid unnecessary loading of that class
-	private static final boolean canUseJBRCustomDecorations =
-		canUseWindowDecorations &&
-		SystemInfo.isJetBrainsJVM_11_orLater &&
-		FlatSystemProperties.getBoolean( FlatSystemProperties.USE_JETBRAINS_CUSTOM_DECORATIONS, false );
-
 	private static Boolean supported;
 	private static Provider nativeProvider;
 
 	public static boolean isSupported() {
-		if( canUseJBRCustomDecorations )
-			return JBRCustomDecorations.isSupported();
-
 		initialize();
 		return supported;
 	}
 
 	static Object install( JRootPane rootPane ) {
-		if( canUseJBRCustomDecorations )
-			return JBRCustomDecorations.install( rootPane );
-
 		if( !isSupported() )
 			return null;
 
@@ -163,11 +158,6 @@ public class FlatNativeWindowBorder
 	}
 
 	static void uninstall( JRootPane rootPane, Object data ) {
-		if( canUseJBRCustomDecorations ) {
-			JBRCustomDecorations.uninstall( rootPane, data );
-			return;
-		}
-
 		if( !isSupported() )
 			return;
 
@@ -215,9 +205,6 @@ public class FlatNativeWindowBorder
 	}
 
 	public static boolean hasCustomDecoration( Window window ) {
-		if( canUseJBRCustomDecorations )
-			return JBRCustomDecorations.hasCustomDecoration( window );
-
 		if( !isSupported() )
 			return false;
 
@@ -225,11 +212,6 @@ public class FlatNativeWindowBorder
 	}
 
 	public static void setHasCustomDecoration( Window window, boolean hasCustomDecoration ) {
-		if( canUseJBRCustomDecorations ) {
-			JBRCustomDecorations.setHasCustomDecoration( window, hasCustomDecoration );
-			return;
-		}
-
 		if( !isSupported() )
 			return;
 
@@ -237,23 +219,18 @@ public class FlatNativeWindowBorder
 	}
 
 	static void setTitleBarHeightAndHitTestSpots( Window window, int titleBarHeight,
-		List<Rectangle> hitTestSpots, Rectangle appIconBounds, Rectangle minimizeButtonBounds,
+		Predicate<Point> captionHitTestCallback, Rectangle appIconBounds, Rectangle minimizeButtonBounds,
 		Rectangle maximizeButtonBounds, Rectangle closeButtonBounds )
 	{
-		if( canUseJBRCustomDecorations ) {
-			JBRCustomDecorations.setTitleBarHeightAndHitTestSpots( window, titleBarHeight, hitTestSpots );
-			return;
-		}
-
 		if( !isSupported() )
 			return;
 
-		nativeProvider.updateTitleBarInfo( window, titleBarHeight, hitTestSpots,
+		nativeProvider.updateTitleBarInfo( window, titleBarHeight, captionHitTestCallback,
 			appIconBounds, minimizeButtonBounds, maximizeButtonBounds, closeButtonBounds );
 	}
 
 	static boolean showWindow( Window window, int cmd ) {
-		if( canUseJBRCustomDecorations || !isSupported() )
+		if( !isSupported() )
 			return false;
 
 		return nativeProvider.showWindow( window, cmd );
@@ -294,7 +271,7 @@ public class FlatNativeWindowBorder
 	{
 		boolean hasCustomDecoration( Window window );
 		void setHasCustomDecoration( Window window, boolean hasCustomDecoration );
-		void updateTitleBarInfo( Window window, int titleBarHeight, List<Rectangle> hitTestSpots,
+		void updateTitleBarInfo( Window window, int titleBarHeight, Predicate<Point> captionHitTestCallback,
 			Rectangle appIconBounds, Rectangle minimizeButtonBounds, Rectangle maximizeButtonBounds,
 			Rectangle closeButtonBounds );
 
@@ -320,20 +297,36 @@ public class FlatNativeWindowBorder
 	 * No longer needed since Windows 11.
 	 */
 	static class WindowTopBorder
-		extends JBRCustomDecorations.JBRWindowTopBorder
+		extends BorderUIResource.EmptyBorderUIResource
 	{
 		private static WindowTopBorder instance;
 
-		static JBRWindowTopBorder getInstance() {
-			if( canUseJBRCustomDecorations )
-				return JBRWindowTopBorder.getInstance();
+		private final Color activeLightColor = new Color( 0x707070 );
+		private final Color activeDarkColor = new Color( 0x2D2E2F );
+		private final Color inactiveLightColor = new Color( 0xaaaaaa );
+		private final Color inactiveDarkColor = new Color( 0x494A4B );
 
+		private boolean colorizationAffectsBorders;
+		private Color activeColor;
+
+		static WindowTopBorder getInstance() {
 			if( instance == null )
 				instance = new WindowTopBorder();
 			return instance;
 		}
 
-		@Override
+		WindowTopBorder() {
+			super( 1, 0, 0, 0 );
+
+			update();
+			installListeners();
+        }
+
+        void update() {
+			colorizationAffectsBorders = isColorizationColorAffectsBorders();
+			activeColor = calculateActiveBorderColor();
+		}
+
 		void installListeners() {
 			nativeProvider.addChangeListener( e -> {
 				update();
@@ -346,19 +339,69 @@ public class FlatNativeWindowBorder
 			} );
 		}
 
-		@Override
 		boolean isColorizationColorAffectsBorders() {
 			return nativeProvider.isColorizationColorAffectsBorders();
 		}
 
-		@Override
 		Color getColorizationColor() {
 			return nativeProvider.getColorizationColor();
 		}
 
-		@Override
 		int getColorizationColorBalance() {
 			return nativeProvider.getColorizationColorBalance();
 		}
+
+		private Color calculateActiveBorderColor() {
+			if( !colorizationAffectsBorders )
+				return null;
+
+			Color colorizationColor = getColorizationColor();
+			if( colorizationColor != null ) {
+				int colorizationColorBalance = getColorizationColorBalance();
+				if( colorizationColorBalance < 0 || colorizationColorBalance > 100 )
+					colorizationColorBalance = 100;
+
+				if( colorizationColorBalance == 0 )
+					return new Color( 0xD9D9D9 );
+				if( colorizationColorBalance == 100 )
+					return colorizationColor;
+
+				float alpha = colorizationColorBalance / 100.0f;
+				float remainder = 1 - alpha;
+				int r = Math.round( colorizationColor.getRed() * alpha + 0xD9 * remainder );
+				int g = Math.round( colorizationColor.getGreen() * alpha + 0xD9 * remainder );
+				int b = Math.round( colorizationColor.getBlue() * alpha + 0xD9 * remainder );
+
+				// avoid potential IllegalArgumentException in Color constructor
+				r = Math.min( Math.max( r, 0 ), 255 );
+				g = Math.min( Math.max( g, 0 ), 255 );
+				b = Math.min( Math.max( b, 0 ), 255 );
+
+				return new Color( r, g, b );
+			}
+
+			Color activeBorderColor = (Color) Toolkit.getDefaultToolkit().getDesktopProperty( "win.frame.activeBorderColor" );
+			return (activeBorderColor != null) ? activeBorderColor : UIManager.getColor( "MenuBar.borderColor" );
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			Window window = SwingUtilities.windowForComponent( c );
+			boolean active = window != null && window.isActive();
+			boolean dark = FlatLaf.isLafDark();
+
+			g.setColor( active
+				? (activeColor != null ? activeColor : (dark ? activeDarkColor : activeLightColor))
+				: (dark ? inactiveDarkColor : inactiveLightColor) );
+			HiDPIUtils.paintAtScale1x( (Graphics2D) g, x, y, width, height, this::paintImpl );
+		}
+
+		private void paintImpl( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+			g.fillRect( x, y, width, 1 );
+		}
+
+		void repaintBorder( Component c ) {
+			c.repaint( 0, 0, c.getWidth(), 1 );
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeWindowsLibrary.java

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Color;
+import java.awt.Window;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Native methods for Windows.
+ * <p>
+ * <b>Note</b>: This is private API. Do not use!
+ *
+ * @author Karl Tauber
+ * @since 3.1
+ */
+public class FlatNativeWindowsLibrary
+{
+	private static int API_VERSION_WINDOWS = 1001;
+
+	private static long osBuildNumber = Long.MIN_VALUE;
+
+	/**
+	 * Checks whether native library is loaded/available.
+	 * <p>
+	 * <b>Note</b>: It is required to invoke this method before invoking any other
+	 *              method of this class. Otherwise, the native library may not be loaded.
+	 */
+	public static boolean isLoaded() {
+		return SystemInfo.isWindows && FlatNativeLibrary.isLoaded( API_VERSION_WINDOWS );
+	}
+
+	/**
+	 * Gets the Windows operating system build number.
+	 * <p>
+	 * Invokes Win32 API method {@code GetVersionEx()} and returns {@code OSVERSIONINFO.dwBuildNumber}.
+	 * See https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getversionexa
+	 */
+	public static long getOSBuildNumber() {
+		if( osBuildNumber == Long.MIN_VALUE )
+			osBuildNumber = getOSBuildNumberImpl();
+		return osBuildNumber;
+	}
+
+	/**
+	 * Invokes Win32 API method {@code GetVersionEx()} and returns {@code OSVERSIONINFO.dwBuildNumber}.
+	 * See https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getversionexa
+	 */
+	private native static long getOSBuildNumberImpl();
+
+	/**
+	 * Gets the Windows window handle (HWND) for the given Swing window.
+	 * <p>
+	 * Note that the underlying Windows window must be already created,
+	 * otherwise this method returns zero. Use following to ensure this:
+	 * <pre>{@code
+	 * if( !window.isDisplayable() )
+	 *     window.addNotify();
+	 * }</pre>
+	 * or invoke this method after packing the window. E.g.
+	 * <pre>{@code
+	 * window.pack();
+	 * long hwnd = getHWND( window );
+	 * }</pre>
+	 */
+	public native static long getHWND( Window window );
+
+	/**
+	 * DWM_WINDOW_CORNER_PREFERENCE
+	 * see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference
+	 */
+	public static final int
+		DWMWCP_DEFAULT = 0,
+		DWMWCP_DONOTROUND = 1,
+		DWMWCP_ROUND = 2,
+		DWMWCP_ROUNDSMALL = 3;
+
+	/**
+	 * Sets the rounded corner preference for the window.
+	 * Allowed values are {@link #DWMWCP_DEFAULT}, {@link #DWMWCP_DONOTROUND},
+	 * {@link #DWMWCP_ROUND} and {@link #DWMWCP_ROUNDSMALL}.
+	 * <p>
+	 * Invokes Win32 API method {@code DwmSetWindowAttribute(DWMWA_WINDOW_CORNER_PREFERENCE)}.
+	 * See https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmsetwindowattribute
+	 * <p>
+	 * Supported since Windows 11 Build 22000.
+	 */
+	public native static boolean setWindowCornerPreference( long hwnd, int cornerPreference );
+
+	/**
+	 * DWMWINDOWATTRIBUTE
+	 * see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
+	 *
+	 * @since 3.3
+	 */
+	public static final int
+		DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
+		DWMWA_BORDER_COLOR = 34,
+		DWMWA_CAPTION_COLOR = 35,
+		DWMWA_TEXT_COLOR = 36;
+
+	/**
+	 * Invokes Win32 API method {@code DwmSetWindowAttribute()} with a {@code BOOL} attribute value.
+	 * See https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmsetwindowattribute
+	 *
+	 * @since 3.3
+	 */
+	public native static boolean dwmSetWindowAttributeBOOL( long hwnd, int attribute, boolean value );
+
+	/**
+	 * Invokes Win32 API method {@code DwmSetWindowAttribute()} with a {@code DWORD} attribute value.
+	 * See https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmsetwindowattribute
+	 *
+	 * @since 3.3
+	 */
+	public native static boolean dwmSetWindowAttributeDWORD( long hwnd, int attribute, int value );
+
+	/** @since 3.3 */
+	public static final int
+		// use this constant to reset any window part colors to the system default behavior
+		DWMWA_COLOR_DEFAULT = 0xFFFFFFFF,
+		// use this constant to specify that a window part should not be rendered
+		DWMWA_COLOR_NONE = 0xFFFFFFFE;
+
+	/** @since 3.3 */
+	public static final Color COLOR_NONE = new Color( 0, true );
+
+	/**
+	 * Invokes Win32 API method {@code DwmSetWindowAttribute()} with a {@code COLORREF} attribute value.
+	 * See https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmsetwindowattribute
+	 * <p>
+	 * Supported since Windows 11 Build 22000.
+	 *
+	 * @since 3.3
+	 */
+	public static boolean dwmSetWindowAttributeCOLORREF( long hwnd, int attribute, Color color ) {
+		// convert color to Windows RGB value
+		int rgb = (color == COLOR_NONE)
+			? DWMWA_COLOR_NONE
+			: (color != null
+				? (color.getRed() | (color.getGreen() << 8) | (color.getBlue() << 16))
+				: DWMWA_COLOR_DEFAULT);
+
+		// DwmSetWindowAttribute() expects COLORREF as attribute value, which is defined as DWORD
+		return dwmSetWindowAttributeDWORD( hwnd, attribute, rgb );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatOptionPaneUI.java

@@ -30,9 +30,7 @@ import javax.swing.JPanel;
 import javax.swing.JRootPane;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
-import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicOptionPaneUI;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -115,13 +113,6 @@ public class FlatOptionPaneUI
 		sameSizeButtons = FlatUIUtils.getUIBoolean( "OptionPane.sameSizeButtons", true );
 	}
 
-	@Override
-	protected void installComponents() {
-		super.installComponents();
-
-		updateChildPanels( optionPane );
-	}
-
 	@Override
 	protected PropertyChangeListener createPropertyChangeListener() {
 		PropertyChangeListener superListener = super.createPropertyChangeListener();
@@ -155,6 +146,13 @@ public class FlatOptionPaneUI
 	protected Container createMessageArea() {
 		Container messageArea = super.createMessageArea();
 
+		// use non-UIResource OptionPane.messageAreaBorder to avoid that it is replaced when switching LaF
+		// and make panel non-opaque for OptionPane.background
+		updateAreaPanel( messageArea );
+
+		// make known sub-panels non-opaque for OptionPane.background
+		updateKnownChildPanels( messageArea );
+
 		// set icon-message gap
 		if( iconMessageGap > 0 ) {
 			Component iconMessageSeparator = SwingUtils.getComponentByName( messageArea, "OptionPane.separator" );
@@ -169,6 +167,10 @@ public class FlatOptionPaneUI
 	protected Container createButtonArea() {
 		Container buttonArea = super.createButtonArea();
 
+		// use non-UIResource OptionPane.buttonAreaBorder to avoid that it is replaced when switching LaF
+		// and make panel non-opaque for OptionPane.background
+		updateAreaPanel( buttonArea );
+
 		// scale button padding and subtract focusWidth
 		if( buttonArea.getLayout() instanceof ButtonAreaLayout ) {
 			ButtonAreaLayout layout = (ButtonAreaLayout) buttonArea.getLayout();
@@ -218,22 +220,33 @@ public class FlatOptionPaneUI
 		super.addMessageComponents( container, cons, msg, maxll, internallyCreated );
 	}
 
-	private void updateChildPanels( Container c ) {
+	private void updateAreaPanel( Container area ) {
+		if( !(area instanceof JPanel) )
+			return;
+
+		// use non-UIResource border to avoid that it is replaced when switching LaF
+		// and make panel non-opaque for OptionPane.background
+		JPanel panel = (JPanel) area;
+		panel.setBorder( FlatUIUtils.nonUIResource( panel.getBorder() ) );
+		panel.setOpaque( false );
+	}
+
+	private void updateKnownChildPanels( Container c ) {
 		for( Component child : c.getComponents() ) {
-			if( child.getClass() == JPanel.class ) {
-				JPanel panel = (JPanel)child;
-
-				// make sub-panel non-opaque for OptionPane.background
-				panel.setOpaque( false );
-
-				// use non-UIResource borders to avoid that they are replaced when switching LaF
-				Border border = panel.getBorder();
-				if( border instanceof UIResource )
-					panel.setBorder( FlatUIUtils.nonUIResource( border ) );
+			if( child instanceof JPanel && child.getName() != null ) {
+				switch( child.getName() ) {
+					case "OptionPane.realBody":
+					case "OptionPane.body":
+					case "OptionPane.separator":
+					case "OptionPane.break":
+						// make known sub-panels non-opaque for OptionPane.background
+						((JPanel)child).setOpaque( false );
+						break;
+				}
 			}
 
 			if( child instanceof Container )
-				updateChildPanels( (Container) child );
+				updateKnownChildPanels( (Container) child );
 		}
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPanelUI.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.beans.PropertyChangeEvent;
@@ -23,6 +24,7 @@ import java.beans.PropertyChangeListener;
 import java.util.Map;
 import javax.swing.JComponent;
 import javax.swing.JPanel;
+import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicPanelUI;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -69,6 +71,8 @@ public class FlatPanelUI
 		super.installUI( c );
 
 		c.addPropertyChangeListener( this );
+		if( c.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER ) != null )
+			FullWindowContentSupport.registerPlaceholder( c );
 
 		installStyle( (JPanel) c );
 	}
@@ -78,10 +82,20 @@ public class FlatPanelUI
 		super.uninstallUI( c );
 
 		c.removePropertyChangeListener( this );
+		if( c.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER ) != null )
+			FullWindowContentSupport.unregisterPlaceholder( c );
 
 		oldStyleValues = null;
 	}
 
+	@Override
+	protected void installDefaults( JPanel p ) {
+		super.installDefaults( p );
+
+		if( p.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER ) != null )
+			LookAndFeel.installProperty( p, "opaque", false );
+	}
+
 	/** @since 2.0.1 */
 	@Override
 	public void propertyChange( PropertyChangeEvent e ) {
@@ -98,6 +112,17 @@ public class FlatPanelUI
 				c.revalidate();
 				c.repaint();
 				break;
+
+			case FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER:
+				JPanel p = (JPanel) e.getSource();
+				if( e.getOldValue() != null )
+					FullWindowContentSupport.unregisterPlaceholder( p );
+				if( e.getNewValue() != null )
+					FullWindowContentSupport.registerPlaceholder( p );
+
+				// make panel non-opaque for placeholders
+				LookAndFeel.installProperty( p, "opaque", e.getNewValue() == null );
+				break;
 		}
 	}
 
@@ -162,4 +187,19 @@ public class FlatPanelUI
 
 		paint( g, c );
 	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		Object value = c.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER );
+		if( value != null )
+			return FullWindowContentSupport.getPlaceholderPreferredSize( c, (String) value );
+
+		return super.getPreferredSize( c );
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		if( c.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_PLACEHOLDER ) != null )
+			FullWindowContentSupport.debugPaint( g, c );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPasswordFieldUI.java

@@ -66,7 +66,6 @@ import com.formdev.flatlaf.util.UIScale;
  * <!-- FlatTextFieldUI -->
  *
  * @uiDefault Component.minimumWidth				int
- * @uiDefault Component.isIntelliJTheme				boolean
  * @uiDefault PasswordField.placeholderForeground	Color
  * @uiDefault PasswordField.focusedBackground		Color	optional
  * @uiDefault PasswordField.iconTextGap				int		optional, default is 4

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupFactory.java

@@ -36,6 +36,7 @@ import java.awt.Window;
 import java.awt.event.ComponentEvent;
 import java.awt.event.ComponentListener;
 import java.awt.event.MouseEvent;
+import java.awt.event.WindowFocusListener;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
@@ -43,6 +44,7 @@ import java.lang.reflect.Method;
 import javax.swing.JComponent;
 import javax.swing.JLayeredPane;
 import javax.swing.JPanel;
+import javax.swing.JPopupMenu;
 import javax.swing.JToolTip;
 import javax.swing.JWindow;
 import javax.swing.Popup;
@@ -52,6 +54,9 @@ import javax.swing.SwingUtilities;
 import javax.swing.ToolTipManager;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
+import javax.swing.border.EmptyBorder;
+import javax.swing.border.LineBorder;
+import javax.swing.plaf.basic.BasicComboPopup;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
@@ -66,6 +71,8 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatPopupFactory
 	extends PopupFactory
 {
+	static final String KEY_POPUP_USES_NATIVE_BORDER = "FlatLaf.internal.FlatPopupFactory.popupUsesNativeBorder";
+
 	private MethodHandle java8getPopupMethod;
 	private MethodHandle java9getPopupMethod;
 
@@ -79,14 +86,34 @@ public class FlatPopupFactory
 			y = pt.y;
 		}
 
+		fixLinuxWaylandJava21focusIssue( owner );
+
 		boolean forceHeavyWeight = isOptionEnabled( owner, contents, FlatClientProperties.POPUP_FORCE_HEAVY_WEIGHT, "Popup.forceHeavyWeight" );
 
 		if( !isOptionEnabled( owner, contents, FlatClientProperties.POPUP_DROP_SHADOW_PAINTED, "Popup.dropShadowPainted" ) || SystemInfo.isProjector || SystemInfo.isWebswing )
 			return new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight ), contents );
 
 		// macOS and Linux adds drop shadow to heavy weight popups
-		if( SystemInfo.isMacOS || SystemInfo.isLinux )
-			return new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, true ), contents );
+		if( SystemInfo.isMacOS || SystemInfo.isLinux ) {
+			NonFlashingPopup popup = new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, true ), contents );
+			if( popup.popupWindow != null && SystemInfo.isMacOS && FlatNativeMacLibrary.isLoaded() )
+				setupRoundedBorder( popup.popupWindow, owner, contents );
+			return popup;
+		}
+
+		// Windows 11 with FlatLaf native library can use rounded corners and shows drop shadow for heavy weight popups
+		if( isWindows11BorderSupported() &&
+			getBorderCornerRadius( owner, contents ) > 0 )
+		{
+			NonFlashingPopup popup = new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, true ), contents );
+			if( popup.popupWindow != null )
+				setupRoundedBorder( popup.popupWindow, owner, contents );
+			return popup;
+		}
+
+		// check whether popup overlaps a heavy weight component
+		if( !forceHeavyWeight && overlapsHeavyWeightComponent( owner, contents, x, y ) )
+			forceHeavyWeight = true;
 
 		// create drop shadow popup
 		return new DropShadowPopup( getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight ), owner, contents );
@@ -140,47 +167,6 @@ public class FlatPopupFactory
 		}
 	}
 
-	/**
-	 * Shows the given popup and, if necessary, fixes the location of a heavy weight popup window.
-	 * <p>
-	 * On a dual screen setup, where screens use different scale factors, it may happen
-	 * that the window location changes when showing a heavy weight popup window.
-	 * E.g. when opening a dialog on the secondary screen and making combobox popup visible.
-	 * <p>
-	 * This is a workaround for https://bugs.openjdk.java.net/browse/JDK-8224608
-	 */
-	private static void showPopupAndFixLocation( Popup popup, Window popupWindow ) {
-		if( popupWindow != null ) {
-			// remember location of heavy weight popup window
-			int x = popupWindow.getX();
-			int y = popupWindow.getY();
-
-			popup.show();
-
-			// restore popup window location if it has changed
-			// (probably scaled when screens use different scale factors)
-			if( popupWindow.getX() != x || popupWindow.getY() != y )
-				popupWindow.setLocation( x, y );
-		} else
-			popup.show();
-	}
-
-	private boolean isOptionEnabled( Component owner, Component contents, String clientKey, String uiKey ) {
-		if( owner instanceof JComponent ) {
-			Boolean b = FlatClientProperties.clientPropertyBooleanStrict( (JComponent) owner, clientKey, null );
-			if( b != null )
-				return b;
-		}
-
-		if( contents instanceof JComponent ) {
-			Boolean b = FlatClientProperties.clientPropertyBooleanStrict( (JComponent) contents, clientKey, null );
-			if( b != null )
-				return b;
-		}
-
-		return UIManager.getBoolean( uiKey );
-	}
-
 	/**
 	 * There is no API in Java 8 to force creation of heavy weight popups,
 	 * but it is possible with reflection. Java 9 provides a new method.
@@ -216,6 +202,33 @@ public class FlatPopupFactory
 		}
 	}
 
+	private static boolean isOptionEnabled( Component owner, Component contents, String clientKey, String uiKey ) {
+		Object value = getOption( owner, contents, clientKey, uiKey );
+		return (value instanceof Boolean) ? (Boolean) value : false;
+	}
+
+	/**
+	 * Get option from:
+	 * <ol>
+	 * <li>client property {@code clientKey} of {@code owner}
+	 * <li>client property {@code clientKey} of {@code contents}
+	 * <li>UI property {@code uiKey}
+	 * </ol>
+	 */
+	private static Object getOption( Component owner, Component contents, String clientKey, String uiKey ) {
+		for( Component c : new Component[] { owner, contents } ) {
+			if( c instanceof JComponent ) {
+				Object value = ((JComponent)c).getClientProperty( clientKey );
+				if( value != null )
+					return value;
+			}
+		}
+
+		return UIManager.get( uiKey );
+	}
+
+	//---- tooltips -----------------------------------------------------------
+
 	/**
 	 * Usually ToolTipManager places a tooltip at (mouseLocation.x, mouseLocation.y + 20).
 	 * In case that the tooltip would be partly outside of the screen,
@@ -300,9 +313,184 @@ public class FlatPopupFactory
 			((JComponent)owner).getToolTipLocation( me ) != null;
 	}
 
+	//---- native rounded border ----------------------------------------------
+
+	private static boolean isWindows11BorderSupported() {
+		return SystemInfo.isWindows_11_orLater && FlatNativeWindowsLibrary.isLoaded();
+	}
+
+	private static void setupRoundedBorder( Window popupWindow, Component owner, Component contents ) {
+		// make sure that the native window is created
+		if( !popupWindow.isDisplayable() )
+			popupWindow.addNotify();
+
+		int borderCornerRadius = getBorderCornerRadius( owner, contents );
+		float borderWidth = getRoundedBorderWidth( owner, contents );
+
+		// get Swing border color
+		Color borderColor = null; // use system default color
+		if( contents instanceof JComponent ) {
+			Border border = ((JComponent)contents).getBorder();
+			border = FlatUIUtils.unwrapNonUIResourceBorder( border );
+
+			// get color from border of contents (e.g. JPopupMenu or JToolTip)
+			if( border instanceof FlatLineBorder )
+				borderColor = ((FlatLineBorder)border).getLineColor();
+			else if( border instanceof LineBorder )
+				borderColor = ((LineBorder)border).getLineColor();
+			else if( border instanceof EmptyBorder )
+				borderColor = FlatNativeWindowsLibrary.COLOR_NONE; // do not paint border
+
+			// avoid that FlatLineBorder paints the Swing border
+			((JComponent)contents).putClientProperty( KEY_POPUP_USES_NATIVE_BORDER, true );
+		}
+
+		if( SystemInfo.isWindows ) {
+			// get native window handle
+			long hwnd = FlatNativeWindowsLibrary.getHWND( popupWindow );
+
+			// set corner preference
+			int cornerPreference = (borderCornerRadius <= 4)
+				? FlatNativeWindowsLibrary.DWMWCP_ROUNDSMALL  // 4px
+				: FlatNativeWindowsLibrary.DWMWCP_ROUND;      // 8px
+			FlatNativeWindowsLibrary.setWindowCornerPreference( hwnd, cornerPreference );
+
+			// set border color
+			FlatNativeWindowsLibrary.dwmSetWindowAttributeCOLORREF( hwnd, FlatNativeWindowsLibrary.DWMWA_BORDER_COLOR, borderColor );
+		} else if( SystemInfo.isMacOS ) {
+			if( borderColor == null || borderColor == FlatNativeWindowsLibrary.COLOR_NONE )
+				borderWidth = 0;
+
+			// set corner radius, border width and color
+			FlatNativeMacLibrary.setWindowRoundedBorder( popupWindow, borderCornerRadius,
+				borderWidth, (borderColor != null) ? borderColor.getRGB() : 0 );
+		}
+	}
+
+	private static void resetWindows11Border( Window popupWindow ) {
+		// get window handle
+		long hwnd = FlatNativeWindowsLibrary.getHWND( popupWindow );
+		if( hwnd == 0 )
+			return;
+
+		// reset corner preference
+		FlatNativeWindowsLibrary.setWindowCornerPreference( hwnd, FlatNativeWindowsLibrary.DWMWCP_DONOTROUND );
+	}
+
+	private static int getBorderCornerRadius( Component owner, Component contents ) {
+		String uiKey =
+			(contents instanceof BasicComboPopup) ? "ComboBox.borderCornerRadius" :
+			(contents instanceof JPopupMenu) ? "PopupMenu.borderCornerRadius" :
+			(contents instanceof JToolTip) ? "ToolTip.borderCornerRadius" :
+			"Popup.borderCornerRadius";
+
+		Object value = getOption( owner, contents, FlatClientProperties.POPUP_BORDER_CORNER_RADIUS, uiKey );
+		return (value instanceof Integer) ? (Integer) value : 0;
+	}
+
+	private static float getRoundedBorderWidth( Component owner, Component contents ) {
+		String uiKey =
+			(contents instanceof BasicComboPopup) ? "ComboBox.roundedBorderWidth" :
+			(contents instanceof JPopupMenu) ? "PopupMenu.roundedBorderWidth" :
+			(contents instanceof JToolTip) ? "ToolTip.roundedBorderWidth" :
+			"Popup.roundedBorderWidth";
+
+		Object value = getOption( owner, contents, FlatClientProperties.POPUP_ROUNDED_BORDER_WIDTH, uiKey );
+		return (value instanceof Number) ? ((Number)value).floatValue() : 0;
+	}
+
+	//---- fixes --------------------------------------------------------------
+
+	private static boolean overlapsHeavyWeightComponent( Component owner, Component contents, int x, int y ) {
+		if( owner == null )
+			return false;
+
+		Window window = SwingUtilities.getWindowAncestor( owner );
+		if( window == null )
+			return false;
+
+		Rectangle r = new Rectangle( new Point( x, y ), contents.getPreferredSize() );
+		return overlapsHeavyWeightComponent( window, r );
+	}
+
+	private static boolean overlapsHeavyWeightComponent( Component parent, Rectangle r ) {
+		if( !parent.isVisible() || !r.intersects( parent.getBounds() ) )
+			return false;
+
+		if( !parent.isLightweight() && !(parent instanceof Window) )
+			return true;
+
+		if( parent instanceof Container ) {
+			Rectangle r2 = new Rectangle( r.x - parent.getX(), r.y - parent.getY(), r.width, r.height );
+			for( Component c : ((Container)parent).getComponents() ) {
+				if( overlapsHeavyWeightComponent( c, r2 ) )
+					return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * On Linux with Wayland, since Java 21, Swing adds a window focus listener to popup owner/invoker window,
+	 * which hides the popup as soon as the owner/invoker window looses focus.
+	 * This works fine for light-weight popups.
+	 * It also works for heavy-weight popups if they do not request focus.
+	 * Because FlatLaf always uses heavy-weight popups, all popups that request focus
+	 * are broken since Java 21.
+	 *
+	 * This method removes the problematic window focus listener.
+	 *
+	 * https://bugs.openjdk.org/browse/JDK-8280993
+	 * https://github.com/openjdk/jdk/pull/13830
+	 */
+	private static void fixLinuxWaylandJava21focusIssue( Component owner ) {
+		// only necessary on Linux when running in Java 21+
+		if( owner == null || !SystemInfo.isLinux || SystemInfo.javaVersion < SystemInfo.toVersion( 21, 0, 0, 0 ) )
+			return;
+
+		// get window
+		Window window = SwingUtilities.getWindowAncestor( owner );
+		if( window == null )
+			return;
+
+		// remove window focus listener, which was added from class sun.awt.UNIXToolkit since Java 21
+		for( WindowFocusListener l : window.getWindowFocusListeners() ) {
+			if( "sun.awt.UNIXToolkit$1".equals( l.getClass().getName() ) ) {
+				window.removeWindowFocusListener( l );
+				break;
+			}
+		}
+	}
+
+	/**
+	 * Shows the given popup and, if necessary, fixes the location of a heavy weight popup window.
+	 * <p>
+	 * On a dual screen setup, where screens use different scale factors, it may happen
+	 * that the window location changes when showing a heavy weight popup window.
+	 * E.g. when opening a dialog on the secondary screen and making combobox popup visible.
+	 * <p>
+	 * This is a workaround for https://bugs.openjdk.java.net/browse/JDK-8224608
+	 */
+	private static void showPopupAndFixLocation( Popup popup, Window popupWindow ) {
+		if( popupWindow != null ) {
+			// remember location of heavy weight popup window
+			int x = popupWindow.getX();
+			int y = popupWindow.getY();
+
+			popup.show();
+
+			// restore popup window location if it has changed
+			// (probably scaled when screens use different scale factors)
+			if( popupWindow.getX() != x || popupWindow.getY() != y )
+				popupWindow.setLocation( x, y );
+		} else
+			popup.show();
+	}
+
 	//---- class NonFlashingPopup ---------------------------------------------
 
-	private class NonFlashingPopup
+	private static class NonFlashingPopup
 		extends Popup
 	{
 		private Popup delegate;
@@ -353,6 +541,9 @@ public class FlatPopupFactory
 
 		@Override
 		public void hide() {
+			if( contents instanceof JComponent )
+				((JComponent)contents).putClientProperty( KEY_POPUP_USES_NATIVE_BORDER, null );
+
 			if( delegate != null ) {
 				delegate.hide();
 				delegate = null;
@@ -431,6 +622,14 @@ public class FlatPopupFactory
 					oldDropShadowWindowBackground = dropShadowWindow.getBackground();
 					dropShadowWindow.setBackground( new Color( 0, true ) );
 				}
+
+				// Windows 11: reset corner preference on reused heavy weight popups
+				if( isWindows11BorderSupported() ) {
+					resetWindows11Border( popupWindow );
+					if( dropShadowWindow != null )
+						resetWindows11Border( dropShadowWindow );
+				}
+
 			} else {
 				mediumWeightPanel = (Panel) SwingUtilities.getAncestorOfClass( Panel.class, contents );
 				if( mediumWeightPanel != null ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuUI.java

@@ -67,6 +67,7 @@ import javax.swing.plaf.basic.BasicComboPopup;
 import javax.swing.plaf.basic.BasicMenuItemUI;
 import javax.swing.plaf.basic.BasicPopupMenuUI;
 import javax.swing.plaf.basic.DefaultMenuLayout;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.LoggingFacade;
@@ -192,27 +193,38 @@ public class FlatPopupMenuUI
 
 	@Override
 	public Popup getPopup( JPopupMenu popup, int x, int y ) {
+		Dimension popupSize = popup.getPreferredSize();
+		Rectangle screenBounds = getScreenBoundsAt( x, y );
+
+		// make sure that popup does not overlap any task/side bar
+		if( x + popupSize.width > screenBounds.x + screenBounds.width )
+			x = screenBounds.x + screenBounds.width - popupSize.width;
+		if( y + popupSize.height > screenBounds.y + screenBounds.height )
+			y = screenBounds.y + screenBounds.height - popupSize.height;
+		if( x < screenBounds.x )
+			x = screenBounds.x;
+		if( y < screenBounds.y )
+			y = screenBounds.y;
+
 		// do not add scroller to combobox popups or to popups that already have a scroll pane
 		if( popup instanceof BasicComboPopup ||
 			(popup.getComponentCount() > 0 && popup.getComponent( 0 ) instanceof JScrollPane) )
 		  return super.getPopup( popup, x, y );
 
 		// do not add scroller if popup fits into screen
-		Dimension prefSize = popup.getPreferredSize();
-		int screenHeight = getScreenHeightAt( x, y );
-		if( prefSize.height <= screenHeight )
+		if( popupSize.height <= screenBounds.height )
 			return super.getPopup( popup, x, y );
 
 		// create scroller
 		FlatPopupScroller scroller = new FlatPopupScroller( popup );
-		scroller.setPreferredSize( new Dimension( prefSize.width, screenHeight ) );
+		scroller.setPreferredSize( new Dimension( popupSize.width, screenBounds.height ) );
 
 		// create popup
 		PopupFactory popupFactory = PopupFactory.getSharedInstance();
 		return popupFactory.getPopup( popup.getInvoker(), scroller, x, y );
 	}
 
-	private int getScreenHeightAt( int x, int y ) {
+	private Rectangle getScreenBoundsAt( int x, int y ) {
 		// find GraphicsConfiguration at popup location (similar to JPopupMenu.getCurrentGraphicsConfiguration())
 		GraphicsConfiguration gc = null;
 		for( GraphicsDevice device : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices() ) {
@@ -233,7 +245,7 @@ public class FlatPopupMenuUI
 		Toolkit toolkit = Toolkit.getDefaultToolkit();
 		Rectangle screenBounds = (gc != null) ? gc.getBounds() : new Rectangle( toolkit.getScreenSize() );
 		Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets( gc );
-		return screenBounds.height - screenInsets.top - screenInsets.bottom;
+		return FlatUIUtils.subtractInsets( screenBounds, screenInsets );
 	}
 
 	//---- class FlatPopupMenuLayout ------------------------------------------
@@ -297,6 +309,9 @@ public class FlatPopupMenuUI
 			popup.addMenuKeyListener( this );
 
 			updateArrowButtons();
+
+			putClientProperty( FlatClientProperties.POPUP_BORDER_CORNER_RADIUS,
+				UIManager.getInt( "PopupMenu.borderCornerRadius" ) );
 		}
 
 		void scroll( int unitsToScroll ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRadioButtonUI.java

@@ -35,6 +35,7 @@ import javax.swing.CellRendererPane;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingConstants;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
@@ -208,6 +209,9 @@ public class FlatRadioButtonUI
 			return ((FlatCheckBoxIcon)icon).applyStyleProperty( key, value );
 		}
 
+		if( "iconTextGap".equals( key ) && value instanceof Integer )
+			value = UIScale.scale( (Integer) value );
+
 		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, b, key, value );
 	}
 
@@ -259,7 +263,7 @@ public class FlatRadioButtonUI
 
 	@Override
 	public void paint( Graphics g, JComponent c ) {
-		// fill background even if not opaque if
+		// fill background even if not opaque and if:
 		// - contentAreaFilled is true and
 		// - if background color is different to default background color
 		// (this paints selection if using the component as cell renderer)
@@ -275,20 +279,27 @@ public class FlatRadioButtonUI
 		int focusWidth = getIconFocusWidth( c );
 		if( focusWidth > 0 ) {
 			boolean ltr = c.getComponentOrientation().isLeftToRight();
+			int halign = ((AbstractButton)c).getHorizontalAlignment();
+			if( halign == SwingConstants.LEADING )
+				halign = ltr ? SwingConstants.LEFT : SwingConstants.RIGHT;
+			else if( halign == SwingConstants.TRAILING )
+				halign = ltr ? SwingConstants.RIGHT : SwingConstants.LEFT;
+
 			Insets insets = c.getInsets( tempInsets );
-			int leftOrRightInset = ltr ? insets.left : insets.right;
-			if( focusWidth > leftOrRightInset ) {
+			if( (focusWidth > insets.left || focusWidth > insets.right) &&
+				(halign == SwingConstants.LEFT || halign == SwingConstants.RIGHT) )
+			{
 				// The left (or right) inset is smaller than the focus width, which may be
 				// the case if insets were explicitly reduced (e.g. with an EmptyBorder).
 				// In this case the width has been increased in getPreferredSize() and
 				// here it is necessary to fix icon and text painting location.
-				int offset = focusWidth - leftOrRightInset;
-				if( !ltr )
-					offset = -offset;
+				int offset = (halign == SwingConstants.LEFT)
+					? Math.max( focusWidth - insets.left, 0 )
+					: -Math.max( focusWidth - insets.right, 0 );
 
 				// move the graphics origin to the left (or right)
 				g.translate( offset, 0 );
-				super.paint( g, c );
+				super.paint( FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c ), c );
 				g.translate( -offset, 0 );
 				return;
 			}
@@ -325,6 +336,11 @@ public class FlatRadioButtonUI
 			: 0;
 	}
 
+	@Override
+	public int getBaseline( JComponent c, int width, int height ) {
+		return FlatButtonUI.getBaselineImpl( c, width, height );
+	}
+
 	//---- class FlatRadioButtonListener --------------------------------------
 
 	/** @since 2 */

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java

@@ -23,12 +23,11 @@ import java.awt.Dimension;
 import java.awt.Frame;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
+import java.awt.IllegalComponentStateException;
 import java.awt.Insets;
 import java.awt.LayoutManager;
 import java.awt.LayoutManager2;
 import java.awt.Window;
-import java.awt.event.ComponentAdapter;
-import java.awt.event.ComponentEvent;
 import java.awt.event.ComponentListener;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
@@ -40,7 +39,6 @@ import javax.swing.JLayeredPane;
 import javax.swing.JMenuBar;
 import javax.swing.JRootPane;
 import javax.swing.LookAndFeel;
-import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
 import javax.swing.plaf.BorderUIResource;
@@ -87,8 +85,8 @@ public class FlatRootPaneUI
 
 	private Object nativeWindowBorderData;
 	private LayoutManager oldLayout;
-	private PropertyChangeListener ancestorListener;
-	private ComponentListener componentListener;
+	private ComponentListener macFullWindowContentListener;
+	private PropertyChangeListener macWindowBackgroundListener;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRootPaneUI();
@@ -106,6 +104,7 @@ public class FlatRootPaneUI
 			installBorder();
 
 		installNativeWindowBorder();
+		macInstallFullWindowContentSupport();
 	}
 
 	protected void installBorder() {
@@ -122,6 +121,7 @@ public class FlatRootPaneUI
 
 		uninstallNativeWindowBorder();
 		uninstallClientDecorations();
+		macUninstallFullWindowContentSupport();
 		rootPane = null;
 	}
 
@@ -156,9 +156,7 @@ public class FlatRootPaneUI
 				parent.setBackground( UIManager.getColor( "control" ) );
 		}
 
-		// enable dark window appearance on macOS when running in JetBrains Runtime
-		if( SystemInfo.isJetBrainsJVM && SystemInfo.isMacOS_10_14_Mojave_orLater )
-			c.putClientProperty( "jetbrains.awt.windowDarkAppearance", FlatLaf.isLafDark() );
+		macClearBackgroundForTranslucentWindow( c );
 	}
 
 	@Override
@@ -178,55 +176,20 @@ public class FlatRootPaneUI
 	protected void installListeners( JRootPane root ) {
 		super.installListeners( root );
 
-		if( SystemInfo.isJava_9_orLater ) {
-			// On HiDPI screens, where scaling is used, there may be white lines on the
-			// bottom and on the right side of the window when it is initially shown.
-			// This is very disturbing in dark themes, but hard to notice in light themes.
-			// Seems to be a rounding issue when Swing adds dirty region of window
-			// using RepaintManager.nativeAddDirtyRegion().
-			//
-			// Note: Not using a HierarchyListener here, which would be much easier,
-			// because this causes problems with mouse clicks in heavy-weight popups.
-			// Instead, add a listener to the root pane that waits until it is added
-			// to a window, then add a component listener to the window.
-			// See: https://github.com/JFormDesigner/FlatLaf/issues/371
-			ancestorListener = e -> {
-				Object oldValue = e.getOldValue();
-				Object newValue = e.getNewValue();
-				if( newValue instanceof Window ) {
-					if( componentListener == null ) {
-						componentListener = new ComponentAdapter() {
-							@Override
-							public void componentShown( ComponentEvent e ) {
-								// add whole root pane to dirty regions when window is initially shown
-								root.getParent().repaint( root.getX(), root.getY(), root.getWidth(), root.getHeight() );
-							}
-						};
-					}
-					((Window)newValue).addComponentListener( componentListener );
-				} else if( newValue == null && oldValue instanceof Window ) {
-					if( componentListener != null )
-						((Window)oldValue).removeComponentListener( componentListener );
-				}
-			};
-			root.addPropertyChangeListener( "ancestor", ancestorListener );
-		}
+		if( SystemInfo.isMacFullWindowContentSupported )
+			macFullWindowContentListener = FullWindowContentSupport.macInstallListeners( root );
+		macInstallWindowBackgroundListener( root );
 	}
 
 	@Override
 	protected void uninstallListeners( JRootPane root ) {
 		super.uninstallListeners( root );
 
-		if( SystemInfo.isJava_9_orLater ) {
-			if( componentListener != null ) {
-				Window window = SwingUtilities.windowForComponent( root );
-				if( window != null )
-					window.removeComponentListener( componentListener );
-				componentListener = null;
-			}
-			root.removePropertyChangeListener( "ancestor", ancestorListener );
-			ancestorListener = null;
+		if( SystemInfo.isMacFullWindowContentSupported ) {
+			FullWindowContentSupport.macUninstallListeners( root, macFullWindowContentListener );
+			macFullWindowContentListener = null;
 		}
+		macUninstallWindowBackgroundListener( root );
 	}
 
 	/** @since 1.1.2 */
@@ -306,19 +269,141 @@ public class FlatRootPaneUI
 
 	// layer title pane under frame content layer to allow placing menu bar over title pane
 	protected final static Integer TITLE_PANE_LAYER = JLayeredPane.FRAME_CONTENT_LAYER - 1;
+	private final static Integer TITLE_PANE_MOUSE_LAYER = JLayeredPane.FRAME_CONTENT_LAYER - 2;
+	private final static Integer WINDOW_TOP_BORDER_LAYER = Integer.MAX_VALUE;
+
+	// for fullWindowContent mode, layer title pane over frame content layer to allow placing title bar buttons over content
+	/** @since 3.4 */
+	protected final static Integer TITLE_PANE_FULL_WINDOW_CONTENT_LAYER = JLayeredPane.FRAME_CONTENT_LAYER + 1;
+
+	private Integer getLayerForTitlePane() {
+		return isFullWindowContent( rootPane ) ? TITLE_PANE_FULL_WINDOW_CONTENT_LAYER : TITLE_PANE_LAYER;
+	}
 
 	protected void setTitlePane( FlatTitlePane newTitlePane ) {
 		JLayeredPane layeredPane = rootPane.getLayeredPane();
 
-		if( titlePane != null )
+		if( titlePane != null ) {
 			layeredPane.remove( titlePane );
+			layeredPane.remove( titlePane.mouseLayer );
+			if( titlePane.windowTopBorderLayer != null )
+				layeredPane.remove( titlePane.windowTopBorderLayer );
+		}
 
-		if( newTitlePane != null )
-			layeredPane.add( newTitlePane, TITLE_PANE_LAYER );
+		if( newTitlePane != null ) {
+			layeredPane.add( newTitlePane, getLayerForTitlePane() );
+			layeredPane.add( newTitlePane.mouseLayer, TITLE_PANE_MOUSE_LAYER );
+			if( newTitlePane.windowTopBorderLayer != null && newTitlePane.isWindowTopBorderNeeded() && isFullWindowContent( rootPane ) )
+				layeredPane.add( newTitlePane.windowTopBorderLayer, WINDOW_TOP_BORDER_LAYER );
+		}
 
 		titlePane = newTitlePane;
 	}
 
+	private void macInstallFullWindowContentSupport() {
+		if( !SystemInfo.isMacOS )
+			return;
+
+		// set window buttons spacing
+		if( isMacButtonsSpacingSupported() && rootPane.isDisplayable() ) {
+			int buttonsSpacing = FlatNativeMacLibrary.BUTTONS_SPACING_DEFAULT;
+			String value = (String) rootPane.getClientProperty( FlatClientProperties.MACOS_WINDOW_BUTTONS_SPACING );
+			if( value != null ) {
+				switch( value ) {
+					case FlatClientProperties.MACOS_WINDOW_BUTTONS_SPACING_MEDIUM:
+						buttonsSpacing = FlatNativeMacLibrary.BUTTONS_SPACING_MEDIUM;
+						break;
+
+					case FlatClientProperties.MACOS_WINDOW_BUTTONS_SPACING_LARGE:
+						buttonsSpacing = FlatNativeMacLibrary.BUTTONS_SPACING_LARGE;
+						break;
+				}
+			}
+
+			FlatNativeMacLibrary.setWindowButtonsSpacing( getParentWindow( rootPane ), buttonsSpacing );
+		}
+
+		// update buttons bounds client property
+		FullWindowContentSupport.macUpdateFullWindowContentButtonsBoundsProperty( rootPane );
+	}
+
+	private void macUninstallFullWindowContentSupport() {
+		if( !SystemInfo.isMacOS )
+			return;
+
+		// do not uninstall when switching to another FlatLaf theme
+		if( UIManager.getLookAndFeel() instanceof FlatLaf )
+			return;
+
+		// reset window buttons spacing
+		if( isMacButtonsSpacingSupported() )
+			FlatNativeMacLibrary.setWindowButtonsSpacing( getParentWindow( rootPane ), FlatNativeMacLibrary.BUTTONS_SPACING_DEFAULT );
+
+		// remove buttons bounds client property
+		FullWindowContentSupport.macUninstallFullWindowContentButtonsBoundsProperty( rootPane );
+	}
+
+	private boolean isMacButtonsSpacingSupported() {
+		return SystemInfo.isMacOS && SystemInfo.isJava_17_orLater && FlatNativeMacLibrary.isLoaded();
+	}
+
+	private void macInstallWindowBackgroundListener( JRootPane c ) {
+		if( !SystemInfo.isMacOS )
+			return;
+
+		Window window = getParentWindow( c );
+		if( window != null && macWindowBackgroundListener == null ) {
+			macWindowBackgroundListener = e -> macClearBackgroundForTranslucentWindow( c );
+			window.addPropertyChangeListener( "background", macWindowBackgroundListener );
+		}
+	}
+
+	private void macUninstallWindowBackgroundListener( JRootPane c ) {
+		if( !SystemInfo.isMacOS )
+			return;
+
+		Window window = getParentWindow( c );
+		if( window != null && macWindowBackgroundListener != null ) {
+			window.removePropertyChangeListener( "background", macWindowBackgroundListener );
+			macWindowBackgroundListener = null;
+		}
+	}
+
+	/**
+	 * When setting window background to translucent color (alpha < 255),
+	 * Swing paints that window translucent on Windows and Linux, but not on macOS.
+	 * The reason for this is that FlatLaf sets the background color of the root pane,
+	 * and Swing behaves a bit differently on macOS than on other platforms in that case.
+	 * Other L&Fs do not set root pane background, which is {@code null} by default.
+	 * <p>
+	 * To fix this problem, set the root pane background to {@code null}
+	 * if windows uses a translucent background.
+	 */
+	private void macClearBackgroundForTranslucentWindow( JRootPane c ) {
+		if( !SystemInfo.isMacOS )
+			return;
+
+		Window window = getParentWindow( c );
+		if( window != null ) {
+			Color windowBackground = window.getBackground();
+			if( windowBackground != null &&
+				windowBackground.getAlpha() < 255 &&
+				c.getBackground() instanceof UIResource )
+			{
+				// clear root pane background
+				c.setBackground( null );
+			}
+		}
+	}
+
+	private Window getParentWindow( JRootPane c ) {
+		// not using SwingUtilities.windowForComponent() or SwingUtilities.getWindowAncestor()
+		// here because root panes may be nested and used anywhere (e.g. in JInternalFrame)
+		// but we're only interested in the "root" root pane, which is a direct child of the window
+		Container parent = c.getParent();
+		return (parent instanceof Window) ? (Window) parent : null;
+	}
+
 	@Override
 	public void propertyChange( PropertyChangeEvent e ) {
 		super.propertyChange( e );
@@ -363,17 +448,73 @@ public class FlatRootPaneUI
 					titlePane.titleBarColorsChanged();
 				break;
 
+			case FlatClientProperties.FULL_WINDOW_CONTENT:
+				if( titlePane != null ) {
+					rootPane.getLayeredPane().setLayer( titlePane, getLayerForTitlePane() );
+					if( titlePane.windowTopBorderLayer != null ) {
+						JLayeredPane layeredPane = rootPane.getLayeredPane();
+						if( titlePane.isWindowTopBorderNeeded() && isFullWindowContent( rootPane ) )
+							layeredPane.add( titlePane.windowTopBorderLayer, WINDOW_TOP_BORDER_LAYER );
+						else
+							layeredPane.remove( titlePane.windowTopBorderLayer );
+					}
+					titlePane.updateIcon();
+					titlePane.updateVisibility();
+					titlePane.updateFullWindowContentButtonsBoundsProperty();
+				}
+				FullWindowContentSupport.revalidatePlaceholders( rootPane );
+				rootPane.revalidate();
+				break;
+
+			case FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_BOUNDS:
+				FullWindowContentSupport.revalidatePlaceholders( rootPane );
+				break;
+
 			case FlatClientProperties.GLASS_PANE_FULL_HEIGHT:
 				rootPane.revalidate();
 				break;
+
+			case FlatClientProperties.WINDOW_STYLE:
+				if( rootPane.isDisplayable() )
+					throw new IllegalComponentStateException( "The client property 'Window.style' must be set before the window becomes displayable." );
+				break;
+
+			case "ancestor":
+				if( e.getNewValue() instanceof Window )
+					macClearBackgroundForTranslucentWindow( rootPane );
+
+				macUninstallWindowBackgroundListener( rootPane );
+				macInstallWindowBackgroundListener( rootPane );
+
+				// FlatNativeMacLibrary.setWindowButtonsSpacing() and
+				// FullWindowContentSupport.macUpdateFullWindowContentButtonsBoundsProperty()
+				// require a native window, but setting the client properties
+				// "apple.awt.fullWindowContent" or FlatClientProperties.MACOS_WINDOW_BUTTONS_SPACING
+				// is usually done before the native window is created
+				// --> try again when native window is created
+				if( e.getNewValue() instanceof Window )
+					macInstallFullWindowContentSupport();
+				break;
+
+			case FlatClientProperties.MACOS_WINDOW_BUTTONS_SPACING:
+				macInstallFullWindowContentSupport();
+				break;
+
+			case "apple.awt.fullWindowContent":
+				if( SystemInfo.isMacFullWindowContentSupported )
+					FullWindowContentSupport.macUpdateFullWindowContentButtonsBoundsProperty( rootPane );
+				break;
 		}
 	}
 
+	/** @since 3.4 */
+	protected static boolean isFullWindowContent( JRootPane rootPane ) {
+		return FlatClientProperties.clientPropertyBoolean( rootPane, FlatClientProperties.FULL_WINDOW_CONTENT, false );
+	}
+
 	protected static boolean isMenuBarEmbedded( JRootPane rootPane ) {
-		RootPaneUI ui = rootPane.getUI();
-		return ui instanceof FlatRootPaneUI &&
-			((FlatRootPaneUI)ui).titlePane != null &&
-			((FlatRootPaneUI)ui).titlePane.isMenuBarEmbedded();
+		FlatTitlePane titlePane = getTitlePane( rootPane );
+		return titlePane != null && titlePane.isMenuBarEmbedded();
 	}
 
 	/** @since 2.4 */
@@ -409,23 +550,21 @@ public class FlatRootPaneUI
 		private Dimension computeLayoutSize( Container parent, Function<Component, Dimension> getSizeFunc ) {
 			JRootPane rootPane = (JRootPane) parent;
 
-			Dimension titlePaneSize = (titlePane != null)
-				? getSizeFunc.apply( titlePane )
-				: new Dimension();
 			Dimension contentSize = (rootPane.getContentPane() != null)
 				? getSizeFunc.apply( rootPane.getContentPane() )
-				: rootPane.getSize();
+				: rootPane.getSize(); // same as in JRootPane.RootLayout.preferredLayoutSize()
 
 			int width = contentSize.width; // title pane width is not considered here
-			int height = titlePaneSize.height + contentSize.height;
+			int height = contentSize.height;
+			if( titlePane != null && !isFullWindowContent( rootPane ) )
+				height += getSizeFunc.apply( titlePane ).height;
 			if( titlePane == null || !titlePane.isMenuBarEmbedded() ) {
 				JMenuBar menuBar = rootPane.getJMenuBar();
-				Dimension menuBarSize = (menuBar != null && menuBar.isVisible())
-					? getSizeFunc.apply( menuBar )
-					: new Dimension();
-
-				width = Math.max( width, menuBarSize.width );
-				height += menuBarSize.height;
+				if( menuBar != null && menuBar.isVisible() ) {
+					Dimension menuBarSize = getSizeFunc.apply( menuBar );
+					width = Math.max( width, menuBarSize.width );
+					height += menuBarSize.height;
+				}
 			}
 
 			Insets insets = rootPane.getInsets();
@@ -450,12 +589,29 @@ public class FlatRootPaneUI
 			if( rootPane.getLayeredPane() != null )
 				rootPane.getLayeredPane().setBounds( x, y, width, height );
 
-			// title pane
+			// title pane (is a child of layered pane)
 			int nextY = 0;
 			if( titlePane != null ) {
 				int prefHeight = !isFullScreen ? titlePane.getPreferredSize().height : 0;
-				titlePane.setBounds( 0, 0, width, prefHeight );
-				nextY += prefHeight;
+				boolean isFullWindowContent = isFullWindowContent( rootPane );
+				if( isFullWindowContent && !UIManager.getBoolean( FlatTitlePane.KEY_DEBUG_SHOW_RECTANGLES ) ) {
+					// place title bar into top-right corner
+					int tw = Math.min( titlePane.getPreferredSize().width, width );
+					int tx = titlePane.getComponentOrientation().isLeftToRight() ? width - tw : 0;
+					titlePane.setBounds( tx, 0, tw, prefHeight );
+				} else
+					titlePane.setBounds( 0, 0, width, prefHeight );
+
+				titlePane.mouseLayer.setBounds( 0, 0, width, prefHeight );
+				if( titlePane.windowTopBorderLayer != null ) {
+					boolean show = isFullWindowContent && !titlePane.isWindowMaximized() && !isFullScreen;
+					if( show )
+						titlePane.windowTopBorderLayer.setBounds( 0, 0, width, 1 );
+					titlePane.windowTopBorderLayer.setVisible( show );
+				}
+
+				if( !isFullWindowContent )
+					nextY += prefHeight;
 			}
 
 			// glass pane
@@ -466,7 +622,7 @@ public class FlatRootPaneUI
 				rootPane.getGlassPane().setBounds( x, y + offset, width, height - offset );
 			}
 
-			// menu bar
+			// menu bar (is a child of layered pane)
 			JMenuBar menuBar = rootPane.getJMenuBar();
 			if( menuBar != null && menuBar.isVisible() ) {
 				boolean embedded = !isFullScreen && titlePane != null && titlePane.isMenuBarEmbedded();
@@ -474,13 +630,23 @@ public class FlatRootPaneUI
 					titlePane.validate();
 					menuBar.setBounds( titlePane.getMenuBarBounds() );
 				} else {
+					int mx = 0;
+					int mw = width;
+					if( titlePane != null && isFullWindowContent( rootPane ) ) {
+						// make menu bar width smaller to avoid that it overlaps title bar buttons
+						int tw = Math.min( titlePane.getPreferredSize().width, width );
+						mw -= tw;
+						if( !titlePane.getComponentOrientation().isLeftToRight() )
+							mx = tw;
+					}
+
 					Dimension prefSize = menuBar.getPreferredSize();
-					menuBar.setBounds( 0, nextY, width, prefSize.height );
+					menuBar.setBounds( mx, nextY, mw, prefSize.height );
 					nextY += prefSize.height;
 				}
 			}
 
-			// content pane
+			// content pane (is a child of layered pane)
 			Container contentPane = rootPane.getContentPane();
 			if( contentPane != null )
 				contentPane.setBounds( 0, nextY, width, Math.max( height - nextY, 0 ) );
@@ -493,7 +659,7 @@ public class FlatRootPaneUI
 		@Override
 		public void invalidateLayout( Container parent ) {
 			if( titlePane != null )
-				titlePane.menuBarChanged();
+				titlePane.menuBarInvalidate();
 		}
 
 		@Override
@@ -551,7 +717,7 @@ public class FlatRootPaneUI
 
 		protected boolean isWindowMaximized( Component c ) {
 			Container parent = c.getParent();
-			return parent instanceof Frame && (((Frame)parent).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0;
+			return parent instanceof Frame && (((Frame)parent).getExtendedState() & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_BOTH;
 		}
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollBarUI.java

@@ -245,7 +245,7 @@ public class FlatScrollBarUI
 								// because scroll bars do not receive mouse exited event.
 								// The scroll pane, including its scroll bars, is not part
 								// of the component hierarchy and does not receive mouse events
-								// directly. Instead LWComponentPeer receives mouse events
+								// directly. Instead, LWComponentPeer receives mouse events
 								// and delegates them to peers, but entered/exited events
 								// are sent only for the whole scroll pane.
 								// Exited event is only sent when mouse leaves scroll pane.

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollPaneBorder.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2023 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Component;
+import java.awt.Insets;
+import javax.swing.JList;
+import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.JTree;
+import javax.swing.UIManager;
+import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Border for {@link javax.swing.JScrollPane}.
+ *
+ * @uiDefault ScrollPane.arc				int
+ * @uiDefault ScrollPane.List.arc			int
+ * @uiDefault ScrollPane.Table.arc			int
+ * @uiDefault ScrollPane.TextComponent.arc	int
+ * @uiDefault ScrollPane.Tree.arc			int
+
+ * @author Karl Tauber
+ * @since 3.3
+ */
+public class FlatScrollPaneBorder
+	extends FlatBorder
+{
+	@Styleable protected int arc = UIManager.getInt( "ScrollPane.arc" );
+
+	private boolean isArcStyled;
+	private final int listArc = FlatUIUtils.getUIInt( "ScrollPane.List.arc", -1 );
+	private final int tableArc = FlatUIUtils.getUIInt( "ScrollPane.Table.arc", -1 );
+	private final int textComponentArc = FlatUIUtils.getUIInt( "ScrollPane.TextComponent.arc", -1 );
+	private final int treeArc = FlatUIUtils.getUIInt( "ScrollPane.Tree.arc", -1 );
+
+	@Override
+	public Object applyStyleProperty( String key, Object value ) {
+		Object oldValue = super.applyStyleProperty( key, value );
+
+		if( "arc".equals( key ) )
+			isArcStyled = true;
+
+		return oldValue;
+	}
+
+	@Override
+	public Insets getBorderInsets( Component c, Insets insets ) {
+		insets = super.getBorderInsets( c, insets );
+
+		// if view is rounded, increase left and right insets to avoid that the viewport
+		// is painted over the rounded border on the corners
+		int padding = getLeftRightPadding( c );
+		if( padding > 0 ) {
+			insets.left += padding;
+			insets.right += padding;
+		}
+
+		return insets;
+	}
+
+	@Override
+	protected int getArc( Component c ) {
+		if( isCellEditor( c ) )
+			return 0;
+
+		if( isArcStyled )
+			return arc;
+
+		if( c instanceof JScrollPane ) {
+			Component view = FlatScrollPaneUI.getView( (JScrollPane) c );
+			if( listArc >= 0 && view instanceof JList )
+				return listArc;
+			if( tableArc >= 0 && view instanceof JTable )
+				return tableArc;
+			if( textComponentArc >= 0&& view instanceof JTextComponent )
+				return textComponentArc;
+			if( treeArc >= 0 && view instanceof JTree )
+				return treeArc;
+		}
+
+		return arc;
+	}
+
+	/**
+	 * Returns the scaled left/right padding used when arc is larger than zero.
+	 * <p>
+	 * This is the distance from the inside of the left border to the left side of the view component.
+	 * On the right side, this is the distance between the right side of the view component and
+	 * the vertical scrollbar. Or the inside of the right border if the scrollbar is hidden.
+	 */
+	public int getLeftRightPadding( Component c ) {
+		// Subtract lineWidth from radius because radius is given for the outside
+		// of the painted line, but insets from super already include lineWidth.
+		// Reduce padding by 10% to make padding slightly smaller because it is not recognizable
+		// when the view is minimally painted over the beginning of the border curve.
+		int arc = getArc( c );
+		return (arc > 0)
+			? Math.max( Math.round( UIScale.scale( ((arc / 2f) - getLineWidth( c )) * 0.9f ) ), 0 )
+			: 0;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollPaneUI.java

@@ -17,9 +17,12 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Component;
+import java.awt.Container;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.Insets;
 import java.awt.KeyboardFocusManager;
+import java.awt.LayoutManager;
 import java.awt.Rectangle;
 import java.awt.event.ContainerEvent;
 import java.awt.event.ContainerListener;
@@ -41,16 +44,19 @@ import javax.swing.JTree;
 import javax.swing.JViewport;
 import javax.swing.LookAndFeel;
 import javax.swing.ScrollPaneConstants;
+import javax.swing.ScrollPaneLayout;
 import javax.swing.Scrollable;
 import javax.swing.SwingConstants;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicScrollPaneUI;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JScrollPane}.
@@ -97,7 +103,13 @@ public class FlatScrollPaneUI
 		super.installUI( c );
 
 		int focusWidth = UIManager.getInt( "Component.focusWidth" );
-		LookAndFeel.installProperty( c, "opaque", focusWidth == 0 );
+		int arc = UIManager.getInt( "ScrollPane.arc" );
+		LookAndFeel.installProperty( c, "opaque", focusWidth == 0 && arc == 0 );
+
+		// install layout manager
+		LayoutManager layout = c.getLayout();
+		if( layout != null && layout.getClass() == ScrollPaneLayout.UIResource.class )
+			c.setLayout( createScrollPaneLayout() );
 
 		installStyle();
 
@@ -108,6 +120,10 @@ public class FlatScrollPaneUI
 	public void uninstallUI( JComponent c ) {
 		MigLayoutVisualPadding.uninstall( scrollpane );
 
+		// uninstall layout manager
+		if( c.getLayout() instanceof FlatScrollPaneLayout )
+			c.setLayout( new ScrollPaneLayout.UIResource() );
+
 		super.uninstallUI( c );
 
 		oldStyleValues = null;
@@ -130,6 +146,13 @@ public class FlatScrollPaneUI
 		handler = null;
 	}
 
+	/**
+	 * @since 3.3
+	 */
+	protected FlatScrollPaneLayout createScrollPaneLayout() {
+		return new FlatScrollPaneLayout();
+	}
+
 	@Override
 	protected MouseWheelListener createMouseWheelListener() {
 		MouseWheelListener superListener = super.createMouseWheelListener();
@@ -290,8 +313,7 @@ public class FlatScrollPaneUI
 					Object corner = e.getNewValue();
 					if( corner instanceof JButton &&
 						((JButton)corner).getBorder() instanceof FlatButtonBorder &&
-						scrollpane.getViewport() != null &&
-						scrollpane.getViewport().getView() instanceof JTable )
+						getView( scrollpane ) instanceof JTable )
 					{
 						((JButton)corner).setBorder( BorderFactory.createEmptyBorder() );
 						((JButton)corner).setFocusable( false );
@@ -308,6 +330,18 @@ public class FlatScrollPaneUI
 					scrollpane.revalidate();
 					scrollpane.repaint();
 					break;
+
+				case "border":
+					Object newBorder = e.getNewValue();
+					if( newBorder != null && newBorder == UIManager.getBorder( "Table.scrollPaneBorder" ) ) {
+						// JTable.configureEnclosingScrollPaneUI() replaces the scrollpane border
+						// with another one --> re-apply style on new border
+						borderShared = null;
+						installStyle();
+						scrollpane.revalidate();
+						scrollpane.repaint();
+					}
+					break;
 			}
 		};
 	}
@@ -334,9 +368,10 @@ public class FlatScrollPaneUI
 
 	/** @since 2 */
 	protected Object applyStyleProperty( String key, Object value ) {
-		if( key.equals( "focusWidth" ) ) {
+		if( key.equals( "focusWidth" ) || key.equals( "arc" ) ) {
 			int focusWidth = (value instanceof Integer) ? (int) value : UIManager.getInt( "Component.focusWidth" );
-			LookAndFeel.installProperty( scrollpane, "opaque", focusWidth == 0 );
+			int arc = (value instanceof Integer) ? (int) value : UIManager.getInt( "ScrollPane.arc" );
+			LookAndFeel.installProperty( scrollpane, "opaque", focusWidth == 0 && arc == 0 );
 		}
 
 		if( borderShared == null )
@@ -360,8 +395,8 @@ public class FlatScrollPaneUI
 	protected void updateViewport( PropertyChangeEvent e ) {
 		super.updateViewport( e );
 
-		JViewport oldViewport = (JViewport) (e.getOldValue());
-		JViewport newViewport = (JViewport) (e.getNewValue());
+		JViewport oldViewport = (JViewport) e.getOldValue();
+		JViewport newViewport = (JViewport) e.getNewValue();
 
 		removeViewportListeners( oldViewport );
 		addViewportListeners( newViewport );
@@ -402,13 +437,46 @@ public class FlatScrollPaneUI
 				c.getHeight() - insets.top - insets.bottom );
 		}
 
+		// if view is rounded, paint rounded background with view background color
+		// to ensure that free areas at left and right have same color as view
+		Component view;
+		float arc = getBorderArc( scrollpane );
+		if( arc > 0 && (view = getView( scrollpane )) != null ) {
+			float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+
+			g.setColor( view.getBackground() );
+
+			Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+			FlatUIUtils.paintComponentBackground( (Graphics2D) g, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
+			FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+		}
+
 		paint( g, c );
 	}
 
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		Border viewportBorder = scrollpane.getViewportBorder();
+		if( viewportBorder != null ) {
+			Rectangle r = scrollpane.getViewportBorderBounds();
+			int padding = getBorderLeftRightPadding( scrollpane );
+			JScrollBar vsb = scrollpane.getVerticalScrollBar();
+			if( padding > 0 &&
+				vsb != null && vsb.isVisible() &&
+				scrollpane.getLayout() instanceof FlatScrollPaneLayout &&
+				((FlatScrollPaneLayout)scrollpane.getLayout()).canIncreaseViewportWidth( scrollpane ) )
+			{
+				boolean ltr = scrollpane.getComponentOrientation().isLeftToRight();
+				int extraWidth = Math.min( padding, vsb.getWidth() );
+				viewportBorder.paintBorder( scrollpane, g, r.x - (ltr ? 0 : extraWidth), r.y, r.width + extraWidth, r.height );
+			} else
+				viewportBorder.paintBorder( scrollpane, g, r.x, r.y, r.width, r.height );
+		}
+	}
+
 	/** @since 1.3 */
 	public static boolean isPermanentFocusOwner( JScrollPane scrollPane ) {
-		JViewport viewport = scrollPane.getViewport();
-		Component view = (viewport != null) ? viewport.getView() : null;
+		Component view = getView( scrollPane );
 		if( view == null )
 			return false;
 
@@ -428,6 +496,25 @@ public class FlatScrollPaneUI
 		return false;
 	}
 
+	static Component getView( JScrollPane scrollPane ) {
+		JViewport viewport = scrollPane.getViewport();
+		return (viewport != null) ? viewport.getView() : null;
+	}
+
+	private static float getBorderArc( JScrollPane scrollPane ) {
+		Border border = scrollPane.getBorder();
+		return (border instanceof FlatScrollPaneBorder)
+			? UIScale.scale( (float) ((FlatScrollPaneBorder)border).getArc( scrollPane ) )
+			: 0;
+	}
+
+	private static int getBorderLeftRightPadding( JScrollPane scrollPane ) {
+		Border border = scrollPane.getBorder();
+		return (border instanceof FlatScrollPaneBorder)
+			? ((FlatScrollPaneBorder)border).getLeftRightPadding( scrollPane )
+			: 0;
+	}
+
 	//---- class Handler ------------------------------------------------------
 
 	/**
@@ -450,13 +537,71 @@ public class FlatScrollPaneUI
 		@Override
 		public void focusGained( FocusEvent e ) {
 			// necessary to update focus border
-			scrollpane.repaint();
+			if( scrollpane.getBorder() instanceof FlatBorder )
+				scrollpane.repaint();
 		}
 
 		@Override
 		public void focusLost( FocusEvent e ) {
 			// necessary to update focus border
-			scrollpane.repaint();
+			if( scrollpane.getBorder() instanceof FlatBorder )
+				scrollpane.repaint();
+		}
+	}
+
+	//---- class FlatScrollPaneLayout -----------------------------------------
+
+	/**
+	 * @since 3.3
+	 */
+	protected static class FlatScrollPaneLayout
+		extends ScrollPaneLayout.UIResource
+	{
+		@Override
+		public void layoutContainer( Container parent ) {
+			super.layoutContainer( parent );
+
+			JScrollPane scrollPane = (JScrollPane) parent;
+			int padding = getBorderLeftRightPadding( scrollPane );
+			if( padding > 0 && vsb != null && vsb.isVisible() ) {
+				// move vertical scrollbar to trailing edge
+				Insets insets = scrollPane.getInsets();
+				Rectangle r = vsb.getBounds();
+				int y = Math.max( r.y, insets.top + padding );
+				int y2 = Math.min( r.y + r.height, scrollPane.getHeight() - insets.bottom - padding );
+				boolean ltr = scrollPane.getComponentOrientation().isLeftToRight();
+
+				vsb.setBounds( r.x + (ltr ? padding : -padding), y, r.width, y2 - y );
+
+				// increase width of viewport, column header and horizontal scrollbar
+				if( canIncreaseViewportWidth( scrollPane ) ) {
+					int extraWidth = Math.min( padding, vsb.getWidth() );
+					resizeViewport( viewport, extraWidth, ltr );
+					resizeViewport( colHead, extraWidth, ltr );
+					resizeViewport( hsb, extraWidth, ltr );
+				}
+			}
+		}
+
+		boolean canIncreaseViewportWidth( JScrollPane scrollPane ) {
+			return scrollPane.getComponentOrientation().isLeftToRight()
+				? !isCornerVisible( upperRight ) && !isCornerVisible( lowerRight )
+				: !isCornerVisible( upperLeft ) && !isCornerVisible( lowerLeft );
+		}
+
+		private static boolean isCornerVisible( Component corner ) {
+			return corner != null &&
+				corner.getWidth() > 0 &&
+				corner.getHeight() > 0 &&
+				corner.isVisible();
+		}
+
+		private static void resizeViewport( Component c, int extraWidth, boolean ltr ) {
+			if( c == null )
+				return;
+
+			Rectangle vr = c.getBounds();
+			c.setBounds( vr.x - (ltr ? 0 : extraWidth), vr.y, vr.width + extraWidth, vr.height );
 		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSpinnerUI.java

@@ -67,7 +67,6 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * @uiDefault Component.minimumWidth			int
  * @uiDefault Spinner.buttonStyle				String	button (default), mac or none
  * @uiDefault Component.arrowType				String	chevron (default) or triangle
- * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault Spinner.disabledBackground		Color
  * @uiDefault Spinner.disabledForeground		Color
  * @uiDefault Spinner.focusedBackground			Color	optional
@@ -92,7 +91,6 @@ public class FlatSpinnerUI
 	@Styleable protected int minimumWidth;
 	@Styleable protected String buttonStyle;
 	@Styleable protected String arrowType;
-	protected boolean isIntelliJTheme;
 	@Styleable protected Color disabledBackground;
 	@Styleable protected Color disabledForeground;
 	@Styleable protected Color focusedBackground;
@@ -129,7 +127,6 @@ public class FlatSpinnerUI
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		buttonStyle = UIManager.getString( "Spinner.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		disabledBackground = UIManager.getColor( "Spinner.disabledBackground" );
 		disabledForeground = UIManager.getColor( "Spinner.disabledForeground" );
 		focusedBackground = UIManager.getColor( "Spinner.focusedBackground" );
@@ -316,7 +313,7 @@ public class FlatSpinnerUI
 
 			return background;
 		} else
-			return isIntelliJTheme ? FlatUIUtils.getParentBackground( spinner ) : disabledBackground;
+			return disabledBackground;
 	}
 
 	protected Color getForeground( boolean enabled ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSplitPaneUI.java

@@ -16,7 +16,9 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Canvas;
 import java.awt.Color;
+import java.awt.Component;
 import java.awt.Container;
 import java.awt.Cursor;
 import java.awt.Graphics;
@@ -67,6 +69,8 @@ import com.formdev.flatlaf.util.UIScale;
  * <!-- FlatSplitPaneUI -->
  *
  * @uiDefault Component.arrowType						String	chevron (default) or triangle
+ * @uiDefault SplitPaneDivider.hoverColor				Color	optional
+ * @uiDefault SplitPaneDivider.pressedColor				Color	optional
  * @uiDefault SplitPaneDivider.oneTouchArrowColor		Color
  * @uiDefault SplitPaneDivider.oneTouchHoverArrowColor	Color
  * @uiDefault SplitPaneDivider.oneTouchPressedArrowColor Color
@@ -80,14 +84,14 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatSplitPaneUI
 	extends BasicSplitPaneUI
-	implements StyleableUI
+	implements StyleableUI, FlatTitlePane.TitleBarCaptionHitTest
 {
 	@Styleable protected String arrowType;
+	/** @since 3.3 */ @Styleable protected Color draggingColor;
 	@Styleable protected Color oneTouchArrowColor;
 	@Styleable protected Color oneTouchHoverArrowColor;
 	@Styleable protected Color oneTouchPressedArrowColor;
 
-	private PropertyChangeListener propertyChangeListener;
 	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
@@ -105,6 +109,8 @@ public class FlatSplitPaneUI
 	protected void installDefaults() {
 		arrowType = UIManager.getString( "Component.arrowType" );
 
+		draggingColor = UIManager.getColor( "SplitPaneDivider.draggingColor" );
+
 		// get one-touch colors before invoking super.installDefaults() because they are
 		// used in there on LaF switching
 		oneTouchArrowColor = UIManager.getColor( "SplitPaneDivider.oneTouchArrowColor" );
@@ -118,6 +124,8 @@ public class FlatSplitPaneUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		draggingColor = null;
+
 		oneTouchArrowColor = null;
 		oneTouchHoverArrowColor = null;
 		oneTouchPressedArrowColor = null;
@@ -126,19 +134,9 @@ public class FlatSplitPaneUI
 	}
 
 	@Override
-	protected void installListeners() {
-		super.installListeners();
-
-		propertyChangeListener = FlatStylingSupport.createPropertyChangeListener( splitPane, this::installStyle, null );
-		splitPane.addPropertyChangeListener( propertyChangeListener );
-	}
-
-	@Override
-	protected void uninstallListeners() {
-		super.uninstallListeners();
-
-		splitPane.removePropertyChangeListener( propertyChangeListener );
-		propertyChangeListener = null;
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return FlatStylingSupport.createPropertyChangeListener( splitPane, this::installStyle,
+			super.createPropertyChangeListener() );
 	}
 
 	@Override
@@ -194,12 +192,58 @@ public class FlatSplitPaneUI
 		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
 	}
 
+	@Override
+	protected Component createDefaultNonContinuousLayoutDivider() {
+		// only used for non-continuous layout if left or right component is heavy weight
+		return new Canvas() {
+			@Override
+			public void paint( Graphics g ) {
+				if( !isContinuousLayout() && getLastDragLocation() != -1 )
+					paintDragDivider( g, 0 );
+			}
+		};
+	}
+
+	@Override
+	public void finishedPaintingChildren( JSplitPane sp, Graphics g ) {
+		if( sp == splitPane && getLastDragLocation() != -1 && !isContinuousLayout() && !draggingHW )
+			paintDragDivider( g, getLastDragLocation() );
+	}
+
+	private void paintDragDivider( Graphics g, int dividerLocation ) {
+		// divider bounds
+		boolean horizontal = (getOrientation() == JSplitPane.HORIZONTAL_SPLIT);
+		int x = horizontal ? dividerLocation : 0;
+		int y = !horizontal ? dividerLocation : 0;
+		int width = horizontal ? dividerSize : splitPane.getWidth();
+		int height = !horizontal ? dividerSize : splitPane.getHeight();
+
+		// paint background
+		g.setColor( FlatUIUtils.deriveColor( draggingColor, splitPane.getBackground() ) );
+		g.fillRect( x, y, width, height );
+
+		// paint divider style (e.g. grip)
+		if( divider instanceof FlatSplitPaneDivider )
+			((FlatSplitPaneDivider)divider).paintStyle( g, x, y, width, height );
+	}
+
+	//---- interface FlatTitlePane.TitleBarCaptionHitTest ----
+
+	/** @since 3.4 */
+	@Override
+	public Boolean isTitleBarCaptionAt( int x, int y ) {
+		// necessary because BasicSplitPaneDivider adds some mouse listeners for dragging divider
+		return null; // check children
+	}
+
 	//---- class FlatSplitPaneDivider -----------------------------------------
 
 	protected class FlatSplitPaneDivider
 		extends BasicSplitPaneDivider
 	{
 		@Styleable protected String style = UIManager.getString( "SplitPaneDivider.style" );
+		/** @since 3.3 */ @Styleable protected Color hoverColor = UIManager.getColor( "SplitPaneDivider.hoverColor" );
+		/** @since 3.3 */ @Styleable protected Color pressedColor = UIManager.getColor( "SplitPaneDivider.pressedColor" );
 		@Styleable protected Color gripColor = UIManager.getColor( "SplitPaneDivider.gripColor" );
 		@Styleable protected int gripDotCount = FlatUIUtils.getUIInt( "SplitPaneDivider.gripDotCount", 3 );
 		@Styleable protected int gripDotSize = FlatUIUtils.getUIInt( "SplitPaneDivider.gripDotSize", 3 );
@@ -257,20 +301,40 @@ public class FlatSplitPaneUI
 					// necessary to show/hide one-touch buttons on expand/collapse
 					doLayout();
 					break;
+
+				case FlatClientProperties.SPLIT_PANE_EXPANDABLE_SIDE:
+					revalidate();
+					break;
 			}
 		}
 
 		@Override
 		public void paint( Graphics g ) {
+			// paint hover or pressed background
+			Color hoverOrPressedColor = (isContinuousLayout() && dragger != null)
+				? pressedColor
+				: (isMouseOver() && dragger == null
+					? hoverColor
+					: null);
+			if( hoverOrPressedColor != null ) {
+				g.setColor( FlatUIUtils.deriveColor( hoverOrPressedColor, splitPane.getBackground() ) );
+				g.fillRect( 0, 0, getWidth(), getHeight() );
+			}
+
 			super.paint( g );
 
+			paintStyle( g, 0, 0, getWidth(), getHeight() );
+		}
+
+		/** @since 3.3 */
+		protected void paintStyle( Graphics g, int x, int y, int width, int height ) {
 			if( "plain".equals( style ) )
 				return;
 
 			Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
 
 			g.setColor( gripColor );
-			paintGrip( g, 0, 0, getWidth(), getHeight() );
+			paintGrip( g, x, y, width, height );
 
 			FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
 		}
@@ -297,6 +361,29 @@ public class FlatSplitPaneUI
 				: location == (splitPane.getWidth() - getWidth() - insets.right);
 		}
 
+		@Override
+		protected void setMouseOver( boolean mouseOver ) {
+			super.setMouseOver( mouseOver );
+			repaintIfNecessary();
+		}
+
+		@Override
+		protected void prepareForDragging() {
+			super.prepareForDragging();
+			repaintIfNecessary();
+		}
+
+		@Override
+		protected void finishDraggingTo( int location ) {
+			super.finishDraggingTo( location );
+			repaintIfNecessary();
+		}
+
+		private void repaintIfNecessary() {
+			if( hoverColor != null || pressedColor != null )
+				repaint();
+		}
+
 		//---- class FlatOneTouchButton ---------------------------------------
 
 		protected class FlatOneTouchButton

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatStylingSupport.java

@@ -100,15 +100,15 @@ public class FlatStylingSupport
 
 	/** @since 2 */
 	public interface StyleableUI {
-		Map<String, Class<?>> getStyleableInfos( JComponent c );
-		/** @since 2.5 */ Object getStyleableValue( JComponent c, String key );
+		Map<String, Class<?>> getStyleableInfos( JComponent c ) throws IllegalArgumentException;
+		/** @since 2.5 */ Object getStyleableValue( JComponent c, String key ) throws IllegalArgumentException;
 	}
 
 	/** @since 2 */
 	public interface StyleableBorder {
 		Object applyStyleProperty( String key, Object value );
-		Map<String, Class<?>> getStyleableInfos();
-		/** @since 2.5 */ Object getStyleableValue( String key );
+		Map<String, Class<?>> getStyleableInfos() throws IllegalArgumentException;
+		/** @since 2.5 */ Object getStyleableValue( String key ) throws IllegalArgumentException;
 	}
 
 	/** @since 2.5 */
@@ -135,7 +135,9 @@ public class FlatStylingSupport
 		return getStyle( c ) != null || getStyleClass( c ) != null;
 	}
 
-	public static Object getResolvedStyle( JComponent c, String type ) {
+	public static Object getResolvedStyle( JComponent c, String type )
+		throws IllegalArgumentException
+	{
 		Object style = getStyle( c );
 		Object styleClass = getStyleClass( c );
 		Object styleForClasses = getStyleForClasses( styleClass, type );
@@ -175,7 +177,9 @@ public class FlatStylingSupport
 	 * @param type the type of the component
 	 * @return the styles
 	 */
-	public static Object getStyleForClasses( Object styleClass, String type ) {
+	public static Object getStyleForClasses( Object styleClass, String type )
+		throws IllegalArgumentException
+	{
 		if( styleClass == null )
 			return null;
 
@@ -198,7 +202,9 @@ public class FlatStylingSupport
 			return null;
 	}
 
-	private static Object getStyleForClass( String styleClass, String type ) {
+	private static Object getStyleForClass( String styleClass, String type )
+		throws IllegalArgumentException
+	{
 		return joinStyles(
 			UIManager.get( "[style]." + styleClass ),
 			UIManager.get( "[style]" + type + '.' + styleClass ) );
@@ -218,7 +224,9 @@ public class FlatStylingSupport
 	 * @return new joined style
 	 */
 	@SuppressWarnings( "unchecked" )
-	public static Object joinStyles( Object style1, Object style2 ) {
+	public static Object joinStyles( Object style1, Object style2 )
+		throws IllegalArgumentException
+	{
 		if( style1 == null )
 			return style2;
 		if( style2 == null )
@@ -278,6 +286,7 @@ public class FlatStylingSupport
 	 * @throws IllegalArgumentException on syntax errors
 	 * @throws ClassCastException if value type does not fit to expected type
 	 */
+	@SuppressWarnings( "ReturnValueIgnored" ) // Error Prone
 	public static Map<String, Object> parseAndApply( Map<String, Object> oldStyleValues,
 		Object style, BiFunction<String, Object, Object> applyProperty )
 			throws UnknownStyleException, IllegalArgumentException
@@ -379,7 +388,9 @@ public class FlatStylingSupport
 		return map;
 	}
 
-	private static Object parseValue( String key, String value ) {
+	private static Object parseValue( String key, String value )
+		throws IllegalArgumentException
+	{
 		// simple reference
 		if( value.startsWith( "$" ) )
 			return UIManager.get( value.substring( 1 ) );
@@ -474,7 +485,9 @@ public class FlatStylingSupport
 		}
 	}
 
-	private static Object applyToField( Field f, Object obj, Object value, boolean useMethodHandles ) {
+	private static Object applyToField( Field f, Object obj, Object value, boolean useMethodHandles )
+		throws IllegalArgumentException
+	{
 		checkValidField( f );
 
 		if( useMethodHandles && obj instanceof StyleableLookupProvider ) {
@@ -504,7 +517,9 @@ public class FlatStylingSupport
 		}
 	}
 
-	private static Object getFieldValue( Field f, Object obj, boolean useMethodHandles ) {
+	private static Object getFieldValue( Field f, Object obj, boolean useMethodHandles )
+		throws IllegalArgumentException
+	{
 		checkValidField( f );
 
 		if( useMethodHandles && obj instanceof StyleableLookupProvider ) {
@@ -529,7 +544,9 @@ public class FlatStylingSupport
 		return new IllegalArgumentException( "failed to access field '" + f.getDeclaringClass().getName() + "." + f.getName() + "'", ex );
 	}
 
-	private static void checkValidField( Field f ) {
+	private static void checkValidField( Field f )
+		throws IllegalArgumentException
+	{
 		if( !isValidField( f ) )
 			throw new IllegalArgumentException( "field '" + f.getDeclaringClass().getName() + "." + f.getName() + "' is final or static" );
 	}
@@ -539,7 +556,9 @@ public class FlatStylingSupport
 		return (modifiers & (Modifier.FINAL|Modifier.STATIC)) == 0 && !f.isSynthetic();
 	}
 
-	private static Field getStyleableField( StyleableField styleableField ) {
+	private static Field getStyleableField( StyleableField styleableField )
+		throws IllegalArgumentException
+	{
 		String fieldName = styleableField.fieldName();
 		if( fieldName.isEmpty() )
 			fieldName = styleableField.key();
@@ -647,6 +666,7 @@ public class FlatStylingSupport
 
 	static Object applyToAnnotatedObjectOrBorder( Object obj, String key, Object value,
 		JComponent c, AtomicBoolean borderShared )
+			throws IllegalArgumentException
 	{
 		try {
 			return applyToAnnotatedObject( obj, key, value );
@@ -695,7 +715,9 @@ public class FlatStylingSupport
 		};
 	}
 
-	static Border cloneBorder( Border border ) {
+	static Border cloneBorder( Border border )
+		throws IllegalArgumentException
+	{
 		Class<? extends Border> borderClass = border.getClass();
 		try {
 			return borderClass.getDeclaredConstructor().newInstance();
@@ -704,7 +726,9 @@ public class FlatStylingSupport
 		}
 	}
 
-	static Icon cloneIcon( Icon icon ) {
+	static Icon cloneIcon( Icon icon )
+		throws IllegalArgumentException
+	{
 		Class<? extends Icon> iconClass = icon.getClass();
 		try {
 			return iconClass.getDeclaredConstructor().newInstance();
@@ -717,11 +741,15 @@ public class FlatStylingSupport
 	 * Returns a map of all fields annotated with {@link Styleable}.
 	 * The key is the name of the field and the value the type of the field.
 	 */
-	public static Map<String, Class<?>> getAnnotatedStyleableInfos( Object obj ) {
+	public static Map<String, Class<?>> getAnnotatedStyleableInfos( Object obj )
+		throws IllegalArgumentException
+	{
 		return getAnnotatedStyleableInfos( obj, null );
 	}
 
-	public static Map<String, Class<?>> getAnnotatedStyleableInfos( Object obj, Border border ) {
+	public static Map<String, Class<?>> getAnnotatedStyleableInfos( Object obj, Border border )
+		throws IllegalArgumentException
+	{
 		Map<String, Class<?>> infos = new StyleableInfosMap<>();
 		collectAnnotatedStyleableInfos( obj, infos );
 		collectStyleableInfos( border, infos );
@@ -732,7 +760,9 @@ public class FlatStylingSupport
 	 * Search for all fields annotated with {@link Styleable} and add them to the given map.
 	 * The key is the name of the field and the value the type of the field.
 	 */
-	public static void collectAnnotatedStyleableInfos( Object obj, Map<String, Class<?>> infos ) {
+	public static void collectAnnotatedStyleableInfos( Object obj, Map<String, Class<?>> infos )
+		throws IllegalArgumentException
+	{
 		HashSet<String> processedFields = new HashSet<>();
 		Class<?> cls = obj.getClass();
 
@@ -810,7 +840,9 @@ public class FlatStylingSupport
 			infos.put( keyPrefix.concat( e.getKey() ), e.getValue() );
 	}
 
-	public static Object getAnnotatedStyleableValue( Object obj, String key ) {
+	public static Object getAnnotatedStyleableValue( Object obj, String key )
+		throws IllegalArgumentException
+	{
 		String fieldName = keyToFieldName( key );
 		Class<?> cls = obj.getClass();
 
@@ -877,7 +909,9 @@ public class FlatStylingSupport
 		extends LinkedHashMap<K,V>
 	{
 		@Override
-		public V put( K key, V value ) {
+		public V put( K key, V value )
+			throws IllegalArgumentException
+		{
 			V oldValue = super.put( key, value );
 			if( oldValue != null )
 				throw new IllegalArgumentException( "duplicate key '" + key + "'" );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableCellBorder.java

@@ -24,6 +24,7 @@ import java.util.function.Function;
 import javax.swing.JTable;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.border.Border;
 import javax.swing.plaf.TableUI;
 
 /**
@@ -107,17 +108,55 @@ public class FlatTableCellBorder
 	public static class Focused
 		extends FlatTableCellBorder
 	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			if( c != null && c.getClass().getName().equals( "javax.swing.JTable$BooleanRenderer" ) ) {
+				// boolean renderer in JTable does not use Table.focusSelectedCellHighlightBorder
+				// if cell is selected and focused (as DefaultTableCellRenderer does)
+				// --> delegate to Table.focusSelectedCellHighlightBorder
+				//     to make FlatLaf "focus indicator border hiding" work
+				JTable table = (JTable) SwingUtilities.getAncestorOfClass( JTable.class, c );
+				if( table != null &&
+					c.getForeground() == table.getSelectionForeground() &&
+					c.getBackground() == table.getSelectionBackground() )
+				{
+					Border border = UIManager.getBorder( "Table.focusSelectedCellHighlightBorder" );
+					if( border != null ) {
+						border.paintBorder( c, g, x, y, width, height );
+						return;
+					}
+				}
+			}
+
+			super.paintBorder( c, g, x, y, width, height );
+		}
 	}
 
 	//---- class Selected -----------------------------------------------------
 
 	/**
-	 * Border for selected cell that uses margins and paints focus indicator border
-	 * if enabled (Table.showCellFocusIndicator=true) or at least one selected cell is editable.
+	 * Border for selected cell that uses margins and paints focus indicator border.
+	 * The focus indicator is shown under following conditions:
+	 * <ul>
+	 * <li>always if enabled via UI property {@code Table.showCellFocusIndicator=true}
+	 * <li>for row selection mode if exactly one row is selected and at least one cell in that row is editable
+	 * <li>for column selection mode if exactly one column is selected and at least one cell in that column is editable
+	 * <li>never for cell selection mode
+	 * </ul>
+	 * The reason for this logic is to hide the focus indicator when it is not needed,
+	 * and only show it when there are editable cells and the user needs to know
+	 * which cell is focused to start editing.
+	 * <p>
+	 * To avoid possible performance issues, checking for editable cells is limited
+	 * to {@link #maxCheckCellsEditable}. If there are more cells to check,
+	 * the focus indicator is always shown.
 	 */
 	public static class Selected
 		extends FlatTableCellBorder
 	{
+		/** @since 3.1 */
+		public int maxCheckCellsEditable = 50;
+
 		@Override
 		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
 			Boolean b = getStyleFromTableUI( c, ui -> ui.showCellFocusIndicator );
@@ -125,7 +164,7 @@ public class FlatTableCellBorder
 
 			if( !showCellFocusIndicator ) {
 				JTable table = (JTable) SwingUtilities.getAncestorOfClass( JTable.class, c );
-				if( table != null && !isSelectionEditable( table ) )
+				if( table != null && !shouldShowCellFocusIndicator( table ) )
 					return;
 			}
 
@@ -133,28 +172,57 @@ public class FlatTableCellBorder
 		}
 
 		/**
-		 * Checks whether at least one selected cell is editable.
+		 * Returns whether focus indicator border should be shown.
+		 *
+		 * @since 3.1
 		 */
-		protected boolean isSelectionEditable( JTable table ) {
-			if( table.getRowSelectionAllowed() ) {
-				int columnCount = table.getColumnCount();
-				int[] selectedRows = table.getSelectedRows();
-				for( int selectedRow : selectedRows ) {
-					for( int column = 0; column < columnCount; column++ ) {
-						if( table.isCellEditable( selectedRow, column ) )
-							return true;
-					}
-				}
-			}
+		protected boolean shouldShowCellFocusIndicator( JTable table ) {
+			boolean rowSelectionAllowed = table.getRowSelectionAllowed();
+			boolean columnSelectionAllowed = table.getColumnSelectionAllowed();
 
-			if( table.getColumnSelectionAllowed() ) {
+			// do not show for cell selection mode
+			// (unlikely that user wants edit cell in case that multiple cells are selected;
+			// if only a single cell is selected then it is clear where the focus is)
+			if( rowSelectionAllowed && columnSelectionAllowed )
+				return false;
+
+			if( rowSelectionAllowed ) {
+				// row selection mode
+
+				// do not show if more than one row is selected
+				// (unlikely that user wants edit cell in this case)
+				if( table.getSelectedRowCount() != 1 )
+					return false;
+
+				// show always if there are too many columns to check for editable
+				int columnCount = table.getColumnCount();
+				if( columnCount > maxCheckCellsEditable )
+					return true;
+
+				// check whether at least one selected cell is editable
+				int selectedRow = table.getSelectedRow();
+				for( int column = 0; column < columnCount; column++ ) {
+					if( table.isCellEditable( selectedRow, column ) )
+						return true;
+				}
+			} else if( columnSelectionAllowed ) {
+				// column selection mode
+
+				// do not show if more than one column is selected
+				// (unlikely that user wants edit cell in this case)
+				if( table.getSelectedColumnCount() != 1 )
+					return false;
+
+				// show always if there are too many rows to check for editable
 				int rowCount = table.getRowCount();
-				int[] selectedColumns = table.getSelectedColumns();
-				for( int selectedColumn : selectedColumns ) {
-					for( int row = 0; row < rowCount; row++ ) {
-						if( table.isCellEditable( row, selectedColumn ) )
-							return true;
-					}
+				if( rowCount > maxCheckCellsEditable )
+					return true;
+
+				// check whether at least one selected cell is editable
+				int selectedColumn = table.getSelectedColumn();
+				for( int row = 0; row < rowCount; row++ ) {
+					if( table.isCellEditable( row, selectedColumn ) )
+						return true;
 				}
 			}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableHeaderUI.java

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.Container;
 import java.awt.Cursor;
 import java.awt.Dimension;
 import java.awt.Graphics;
@@ -28,16 +29,15 @@ import java.awt.event.MouseEvent;
 import java.awt.geom.Rectangle2D;
 import java.beans.PropertyChangeListener;
 import java.util.Map;
+import javax.swing.CellRendererPane;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.JTable;
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
-import javax.swing.border.Border;
 import javax.swing.event.MouseInputListener;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTableHeaderUI;
 import javax.swing.table.JTableHeader;
 import javax.swing.table.TableCellRenderer;
@@ -59,6 +59,10 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatTableHeaderUI -->
  *
+ * @uiDefault TableHeader.hoverBackground		Color	optional
+ * @uiDefault TableHeader.hoverForeground		Color	optional
+ * @uiDefault TableHeader.pressedBackground		Color	optional
+ * @uiDefault TableHeader.pressedForeground		Color	optional
  * @uiDefault TableHeader.bottomSeparatorColor	Color
  * @uiDefault TableHeader.height				int
  * @uiDefault TableHeader.sortIconPosition		String	right (default), left, top or bottom
@@ -81,6 +85,10 @@ public class FlatTableHeaderUI
 	extends BasicTableHeaderUI
 	implements StyleableUI
 {
+	/** @since 3.1 */ @Styleable protected Color hoverBackground;
+	/** @since 3.1 */ @Styleable protected Color hoverForeground;
+	/** @since 3.1 */ @Styleable protected Color pressedBackground;
+	/** @since 3.1 */ @Styleable protected Color pressedForeground;
 	@Styleable protected Color bottomSeparatorColor;
 	@Styleable protected int height;
 	@Styleable(type=String.class) protected int sortIconPosition;
@@ -106,6 +114,11 @@ public class FlatTableHeaderUI
 	public void installUI( JComponent c ) {
 		super.installUI( c );
 
+		// replace cell renderer pane
+		header.remove( rendererPane );
+		rendererPane = new FlatTableHeaderCellRendererPane();
+		header.add( rendererPane );
+
 		installStyle();
 	}
 
@@ -113,6 +126,10 @@ public class FlatTableHeaderUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		hoverBackground = UIManager.getColor( "TableHeader.hoverBackground" );
+		hoverForeground = UIManager.getColor( "TableHeader.hoverForeground" );
+		pressedBackground = UIManager.getColor( "TableHeader.pressedBackground" );
+		pressedForeground = UIManager.getColor( "TableHeader.pressedForeground" );
 		bottomSeparatorColor = UIManager.getColor( "TableHeader.bottomSeparatorColor" );
 		height = UIManager.getInt( "TableHeader.height" );
 		sortIconPosition = parseSortIconPosition( UIManager.getString( "TableHeader.sortIconPosition" ) );
@@ -122,6 +139,10 @@ public class FlatTableHeaderUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		hoverBackground = null;
+		hoverForeground = null;
+		pressedBackground = null;
+		pressedForeground = null;
 		bottomSeparatorColor = null;
 
 		oldStyleValues = null;
@@ -211,6 +232,12 @@ public class FlatTableHeaderUI
 		return super.getRolloverColumn();
 	}
 
+	@Override
+	protected void rolloverColumnUpdated( int oldColumn, int newColumn ) {
+		header.repaint( header.getHeaderRect( oldColumn ) );
+		header.repaint( header.getHeaderRect( newColumn ) );
+	}
+
 	@Override
 	public void paint( Graphics g, JComponent c ) {
 		fixDraggedAndResizingColumns( header );
@@ -243,21 +270,8 @@ public class FlatTableHeaderUI
 			}
 		}
 
-		// temporary use own default renderer if necessary
-		FlatTableCellHeaderRenderer sortIconRenderer = null;
-		if( sortIconPosition != SwingConstants.RIGHT ) {
-			sortIconRenderer = new FlatTableCellHeaderRenderer( header.getDefaultRenderer() );
-			header.setDefaultRenderer( sortIconRenderer );
-		}
-
 		// paint header
 		super.paint( g, c );
-
-		// restore default renderer
-		if( sortIconRenderer != null ) {
-			sortIconRenderer.reset();
-			header.setDefaultRenderer( sortIconRenderer.delegate );
-		}
 	}
 
 	private boolean isSystemDefaultRenderer( Object headerRenderer ) {
@@ -315,80 +329,129 @@ public class FlatTableHeaderUI
 		return false;
 	}
 
-	//---- class FlatTableCellHeaderRenderer ----------------------------------
+	//---- class FlatTableHeaderCellRendererPane ------------------------------
 
 	/**
-	 * A delegating header renderer that is only used to paint sort arrows at
-	 * top, bottom or left position.
+	 * Cell renderer pane that is used to paint hover and pressed background/foreground
+	 * and to paint sort arrows at top, bottom or left position.
 	 */
-	private class FlatTableCellHeaderRenderer
-		implements TableCellRenderer, Border, UIResource
+	private class FlatTableHeaderCellRendererPane
+		extends CellRendererPane
 	{
-		private final TableCellRenderer delegate;
+		private final Icon ascendingSortIcon;
+		private final Icon descendingSortIcon;
 
-		private JLabel l;
-		private int oldHorizontalTextPosition = -1;
-		private Border origBorder;
-		private Icon sortIcon;
-
-		FlatTableCellHeaderRenderer( TableCellRenderer delegate ) {
-			this.delegate = delegate;
+		public FlatTableHeaderCellRendererPane() {
+			ascendingSortIcon = UIManager.getIcon( "Table.ascendingSortIcon" );
+			descendingSortIcon = UIManager.getIcon( "Table.descendingSortIcon" );
 		}
 
 		@Override
-		public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected,
-			boolean hasFocus, int row, int column )
-		{
-			Component c = delegate.getTableCellRendererComponent( table, value, isSelected, hasFocus, row, column );
-			if( !(c instanceof JLabel) )
-				return c;
-
-			l = (JLabel) c;
-
-			if( sortIconPosition == SwingConstants.LEFT ) {
-				if( oldHorizontalTextPosition < 0 )
-					oldHorizontalTextPosition = l.getHorizontalTextPosition();
-				l.setHorizontalTextPosition( SwingConstants.RIGHT );
-			} else {
-				// top or bottom
-				sortIcon = l.getIcon();
-				origBorder = l.getBorder();
-				l.setIcon( null );
-				l.setBorder( this );
+		public void paintComponent( Graphics g, Component c, Container p, int x, int y, int w, int h, boolean shouldValidate ) {
+			if( !(c instanceof JLabel) ) {
+				super.paintComponent( g, c, p, x, y, w, h, shouldValidate );
+				return;
 			}
 
-			return l;
-		}
+			JLabel l = (JLabel) c;
+			Color oldBackground = null;
+			Color oldForeground = null;
+			boolean oldOpaque = false;
+			Icon oldIcon = null;
+			int oldHorizontalTextPosition = -1;
 
-		void reset() {
-			if( l != null && sortIconPosition == SwingConstants.LEFT && oldHorizontalTextPosition >= 0 )
+			// hover and pressed background/foreground
+			TableColumn draggedColumn = header.getDraggedColumn();
+			Color background = null;
+			Color foreground = null;
+			if( draggedColumn != null &&
+				header.getTable().convertColumnIndexToView( draggedColumn.getModelIndex() )
+					== getColumn( x - header.getDraggedDistance(), w ) )
+			{
+				background = pressedBackground;
+				foreground = pressedForeground;
+			} else if( getRolloverColumn() >= 0 && getRolloverColumn() == getColumn( x, w ) ) {
+				background = hoverBackground;
+				foreground = hoverForeground;
+			}
+			if( background != null ) {
+				oldBackground = l.getBackground();
+				oldOpaque = l.isOpaque();
+				l.setBackground( FlatUIUtils.deriveColor( background, header.getBackground() ) );
+				l.setOpaque( true );
+			}
+			if( foreground != null ) {
+				oldForeground = l.getForeground();
+				l.setForeground( FlatUIUtils.deriveColor( foreground, header.getForeground() ) );
+			}
+
+			// sort icon position
+			Icon icon = l.getIcon();
+			boolean isSortIcon = (icon != null && (icon == ascendingSortIcon || icon == descendingSortIcon));
+			if( isSortIcon ) {
+				if( sortIconPosition == SwingConstants.LEFT ) {
+					// left
+					oldHorizontalTextPosition = l.getHorizontalTextPosition();
+					l.setHorizontalTextPosition( SwingConstants.RIGHT );
+				} else if( sortIconPosition == SwingConstants.TOP || sortIconPosition == SwingConstants.BOTTOM ) {
+					// top or bottom
+					oldIcon = icon;
+					l.setIcon( null );
+				}
+			}
+
+			// paint renderer component
+			super.paintComponent( g, c, p, x, y, w, h, shouldValidate );
+
+			// paint top or bottom sort icon
+			if( isSortIcon && (sortIconPosition == SwingConstants.TOP || sortIconPosition == SwingConstants.BOTTOM) ) {
+				int xi = x + ((w - icon.getIconWidth()) / 2);
+				int yi = (sortIconPosition == SwingConstants.TOP)
+					? y + UIScale.scale( 1 )
+					: y + height - icon.getIconHeight()
+						- 1 // for gap
+						- (int) (1 * UIScale.getUserScaleFactor()); // for bottom border
+				icon.paintIcon( c, g, xi, yi );
+			}
+
+			// restore modified renderer component properties
+			if( background != null ) {
+				l.setBackground( oldBackground );
+				l.setOpaque( oldOpaque );
+			}
+			if( foreground != null )
+				l.setForeground( oldForeground );
+			if( oldIcon != null )
+				l.setIcon( oldIcon );
+			if( oldHorizontalTextPosition >= 0 )
 				l.setHorizontalTextPosition( oldHorizontalTextPosition );
 		}
 
-		@Override
-		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
-			if( origBorder != null )
-				origBorder.paintBorder( c, g, x, y, width, height );
+		/**
+		 * Get column index for given coordinates.
+		 */
+		private int getColumn( int x, int width ) {
+			TableColumnModel columnModel = header.getColumnModel();
+			int columnCount = columnModel.getColumnCount();
+			boolean ltr = header.getComponentOrientation().isLeftToRight();
+			int cx = ltr ? 0 : getWidthInRightToLef();
 
-			if( sortIcon != null ) {
-				int xi = x + ((width - sortIcon.getIconWidth()) / 2);
-				int yi = (sortIconPosition == SwingConstants.TOP)
-					? y + UIScale.scale( 1 )
-					: y + height - sortIcon.getIconHeight()
-						- 1 // for gap
-						- (int) (1 * UIScale.getUserScaleFactor()); // for bottom border
-				sortIcon.paintIcon( c, g, xi, yi );
+			for( int i = 0; i < columnCount; i++ ) {
+				int cw = columnModel.getColumn( i ).getWidth();
+				if( x == cx - (ltr ? 0 : cw) && width == cw )
+					return i;
+
+				cx += ltr ? cw : -cw;
 			}
+			return -1;
 		}
 
-		@Override
-		public Insets getBorderInsets( Component c ) {
-			return (origBorder != null) ? origBorder.getBorderInsets( c ) : new Insets( 0, 0, 0, 0 );
-		}
-
-		@Override
-		public boolean isBorderOpaque() {
-			return (origBorder != null) ? origBorder.isBorderOpaque() : false;
+		// similar to JTableHeader.getWidthInRightToLeft()
+		private int getWidthInRightToLef() {
+			JTable table = header.getTable();
+			return (table != null && table.getAutoResizeMode() != JTable.AUTO_RESIZE_OFF)
+				? table.getWidth()
+				: header.getWidth();
 		}
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableUI.java

@@ -17,27 +17,39 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.EventQueue;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.awt.event.ActionEvent;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import java.awt.geom.Rectangle2D;
+import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.Map;
+import javax.swing.Action;
+import javax.swing.ActionMap;
 import javax.swing.JComponent;
 import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.JTextField;
 import javax.swing.JViewport;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingConstants;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTableUI;
+import javax.swing.table.DefaultTableCellRenderer;
 import javax.swing.table.JTableHeader;
+import javax.swing.table.TableCellRenderer;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.icons.FlatCheckBoxIcon;
 import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.Graphics2DProxy;
@@ -81,6 +93,7 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Table.selectionInactiveBackground			Color
  * @uiDefault Table.selectionInactiveForeground			Color
  * @uiDefault Table.paintOutsideAlternateRows			boolean
+ * @uiDefault Table.editorSelectAllOnStartEditing		boolean
  *
  * <!-- FlatTableCellBorder -->
  *
@@ -116,6 +129,7 @@ public class FlatTableUI
 	private boolean oldShowHorizontalLines;
 	private boolean oldShowVerticalLines;
 	private Dimension oldIntercellSpacing;
+	private TableCellRenderer oldBooleanRenderer;
 
 	private PropertyChangeListener propertyChangeListener;
 	private Map<String, Object> oldStyleValues;
@@ -151,19 +165,35 @@ public class FlatTableUI
 		if( rowHeight > 0 )
 			LookAndFeel.installProperty( table, "rowHeight", UIScale.scale( rowHeight ) );
 
-		if( !showHorizontalLines ) {
+		FlatTablePropertyWatcher watcher = FlatTablePropertyWatcher.get( table );
+		if( watcher != null )
+			watcher.enabled = false;
+
+		if( !showHorizontalLines && (watcher == null || !watcher.showHorizontalLinesChanged) ) {
 			oldShowHorizontalLines = table.getShowHorizontalLines();
 			table.setShowHorizontalLines( false );
 		}
-		if( !showVerticalLines ) {
+		if( !showVerticalLines && (watcher == null || !watcher.showVerticalLinesChanged) ) {
 			oldShowVerticalLines = table.getShowVerticalLines();
 			table.setShowVerticalLines( false );
 		}
 
-		if( intercellSpacing != null ) {
+		if( intercellSpacing != null && (watcher == null || !watcher.intercellSpacingChanged) ) {
 			oldIntercellSpacing = table.getIntercellSpacing();
 			table.setIntercellSpacing( intercellSpacing );
 		}
+
+		if( watcher != null )
+			watcher.enabled = true;
+		else
+			table.addPropertyChangeListener( new FlatTablePropertyWatcher() );
+
+		// install boolean renderer
+		oldBooleanRenderer = table.getDefaultRenderer( Boolean.class );
+		if( oldBooleanRenderer instanceof UIResource )
+			table.setDefaultRenderer( Boolean.class, new FlatBooleanRenderer() );
+		else
+			oldBooleanRenderer = null;
 	}
 
 	@Override
@@ -177,15 +207,36 @@ public class FlatTableUI
 
 		oldStyleValues = null;
 
+		FlatTablePropertyWatcher watcher = FlatTablePropertyWatcher.get( table );
+		if( watcher != null )
+			watcher.enabled = false;
+
 		// restore old show horizontal/vertical lines (if not modified)
-		if( !showHorizontalLines && oldShowHorizontalLines && !table.getShowHorizontalLines() )
-			table.setShowHorizontalLines( true );
-		if( !showVerticalLines && oldShowVerticalLines && !table.getShowVerticalLines() )
-			table.setShowVerticalLines( true );
+		if( !showHorizontalLines && oldShowHorizontalLines && !table.getShowHorizontalLines() &&
+			(watcher == null || !watcher.showHorizontalLinesChanged) )
+		  table.setShowHorizontalLines( true );
+		if( !showVerticalLines && oldShowVerticalLines && !table.getShowVerticalLines() &&
+			(watcher == null || !watcher.showVerticalLinesChanged) )
+		  table.setShowVerticalLines( true );
 
 		// restore old intercell spacing (if not modified)
-		if( intercellSpacing != null && table.getIntercellSpacing().equals( intercellSpacing ) )
-			table.setIntercellSpacing( oldIntercellSpacing );
+		if( intercellSpacing != null && table.getIntercellSpacing().equals( intercellSpacing ) &&
+			(watcher == null || !watcher.intercellSpacingChanged) )
+		  table.setIntercellSpacing( oldIntercellSpacing );
+
+		if( watcher != null )
+			watcher.enabled = true;
+
+		// uninstall boolean renderer
+		if( table.getDefaultRenderer( Boolean.class ) instanceof FlatBooleanRenderer ) {
+			if( oldBooleanRenderer instanceof Component ) {
+				// because the old renderer component was not attached to any component hierarchy,
+				// its UI was not yet updated, and it is necessary to do it here
+				SwingUtilities.updateComponentTreeUI( (Component) oldBooleanRenderer );
+			}
+			table.setDefaultRenderer( Boolean.class, oldBooleanRenderer );
+		}
+		oldBooleanRenderer = null;
 	}
 
 	@Override
@@ -238,6 +289,18 @@ public class FlatTableUI
 		};
 	}
 
+	@Override
+	protected void installKeyboardActions() {
+		super.installKeyboardActions();
+
+		if( UIManager.getBoolean( "Table.editorSelectAllOnStartEditing" ) ) {
+			// get shared action map, used for all tables
+			ActionMap map = SwingUtilities.getUIActionMap( table );
+			if( map != null )
+				StartEditingAction.install( map, "startEditing" );
+		}
+	}
+
 	/** @since 2 */
 	protected void installStyle() {
 		try {
@@ -277,6 +340,9 @@ public class FlatTableUI
 
 	/** @since 2 */
 	protected Object applyStyleProperty( String key, Object value ) {
+		if( "rowHeight".equals( key ) && value instanceof Integer )
+			value = UIScale.scale( (Integer) value );
+
 		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, table, key, value );
 	}
 
@@ -464,4 +530,102 @@ public class FlatTableUI
 			}
 		}
 	}
+
+	//---- class FlatTablePropertyWatcher -------------------------------------
+
+	/**
+	 * Listener that watches for change of some table properties from application code.
+	 * This information is used in {@link FlatTableUI#installDefaults()} and
+	 * {@link FlatTableUI#uninstallDefaults()} to decide whether FlatLaf modifies those properties.
+	 * If they are modified in application code, FlatLaf no longer changes them.
+	 *
+	 * The listener is added once for each table, but never removed.
+	 * So switching Laf/theme reuses existing listener.
+	 */
+	private static class FlatTablePropertyWatcher
+		implements PropertyChangeListener
+	{
+		boolean enabled = true;
+		boolean showHorizontalLinesChanged;
+		boolean showVerticalLinesChanged;
+		boolean intercellSpacingChanged;
+
+		static FlatTablePropertyWatcher get( JTable table ) {
+			for( PropertyChangeListener l : table.getPropertyChangeListeners() ) {
+				if( l instanceof FlatTablePropertyWatcher )
+					return (FlatTablePropertyWatcher) l;
+			}
+			return null;
+		}
+
+		//---- interface PropertyChangeListener ----
+
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			if( !enabled )
+				return;
+
+			switch( e.getPropertyName() ) {
+				case "showHorizontalLines":	showHorizontalLinesChanged = true; break;
+				case "showVerticalLines":	showVerticalLinesChanged = true; break;
+				case "rowMargin":			intercellSpacingChanged = true; break;
+			}
+		}
+	}
+
+	//---- class FlatBooleanRenderer ------------------------------------------
+
+	private static class FlatBooleanRenderer
+		extends DefaultTableCellRenderer
+		implements UIResource
+	{
+		private boolean selected;
+
+		FlatBooleanRenderer() {
+			setHorizontalAlignment( SwingConstants.CENTER );
+			setIcon( new FlatCheckBoxIcon() {
+				@Override
+				protected boolean isSelected( Component c ) {
+					return selected;
+				}
+			} );
+		}
+
+		@Override
+		protected void setValue( Object value ) {
+			selected = (value != null && (Boolean) value);
+		}
+	}
+
+	//---- class StartEditingAction -------------------------------------------
+
+	private static class StartEditingAction
+		extends FlatUIAction
+	{
+		static void install( ActionMap map, String key ) {
+			Action oldAction = map.get( key );
+			if( oldAction == null || oldAction instanceof StartEditingAction )
+				return; // not found or already installed
+
+			map.put( key, new StartEditingAction( oldAction ) );
+		}
+
+		private StartEditingAction( Action delegate ) {
+			super( delegate );
+		}
+
+		@Override
+		public void actionPerformed( ActionEvent e ) {
+			JTable table = (JTable) e.getSource();
+
+			Component oldEditorComp = table.getEditorComponent();
+
+			delegate.actionPerformed( e );
+
+			// select all text in editor if editing starts with F2 key
+			Component editorComp = table.getEditorComponent();
+			if( oldEditorComp == null && editorComp instanceof JTextField )
+				((JTextField)editorComp).selectAll();
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTextAreaUI.java

@@ -54,7 +54,6 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * <!-- FlatTextAreaUI -->
  *
  * @uiDefault Component.minimumWidth			int
- * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault TextArea.disabledBackground		Color	used if not enabled
  * @uiDefault TextArea.inactiveBackground		Color	used if not editable
  * @uiDefault TextArea.focusedBackground		Color	optional
@@ -66,7 +65,6 @@ public class FlatTextAreaUI
 	implements StyleableUI
 {
 	@Styleable protected int minimumWidth;
-	protected boolean isIntelliJTheme;
 	private Color background;
 	@Styleable protected Color disabledBackground;
 	@Styleable protected Color inactiveBackground;
@@ -103,7 +101,6 @@ public class FlatTextAreaUI
 		super.installDefaults();
 
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		background = UIManager.getColor( "TextArea.background" );
 		disabledBackground = UIManager.getColor( "TextArea.disabledBackground" );
 		inactiveBackground = UIManager.getColor( "TextArea.inactiveBackground" );
@@ -227,6 +224,6 @@ public class FlatTextAreaUI
 
 	@Override
 	protected void paintBackground( Graphics g ) {
-		FlatEditorPaneUI.paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
+		FlatEditorPaneUI.paintBackground( g, getComponent(), focusedBackground );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTextFieldUI.java

@@ -45,6 +45,7 @@ import javax.swing.JTextField;
 import javax.swing.JToggleButton;
 import javax.swing.JToolBar;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
@@ -81,7 +82,6 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * <!-- FlatTextFieldUI -->
  *
  * @uiDefault Component.minimumWidth			int
- * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault TextField.placeholderForeground	Color
  * @uiDefault TextField.focusedBackground		Color	optional
  * @uiDefault TextField.iconTextGap				int		optional, default is 4
@@ -95,7 +95,6 @@ public class FlatTextFieldUI
 	implements StyleableUI
 {
 	@Styleable protected int minimumWidth;
-	protected boolean isIntelliJTheme;
 	private Color background;
 	@Styleable protected Color disabledBackground;
 	@Styleable protected Color inactiveBackground;
@@ -165,7 +164,6 @@ public class FlatTextFieldUI
 
 		String prefix = getPropertyPrefix();
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		background = UIManager.getColor( prefix + ".background" );
 		disabledBackground = UIManager.getColor( prefix + ".disabledBackground" );
 		inactiveBackground = UIManager.getColor( prefix + ".inactiveBackground" );
@@ -402,7 +400,7 @@ public class FlatTextFieldUI
 
 	@Override
 	protected void paintSafely( Graphics g ) {
-		paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
+		paintBackground( g, getComponent(), focusedBackground );
 		paintPlaceholder( g );
 
 		if( hasLeadingIcon() || hasTrailingIcon() )
@@ -422,7 +420,7 @@ debug*/
 		// background is painted elsewhere
 	}
 
-	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme, Color focusedBackground ) {
+	static void paintBackground( Graphics g, JTextComponent c, Color focusedBackground ) {
 		// do not paint background if:
 		//   - not opaque and
 		//   - border is not a flat border and
@@ -443,14 +441,14 @@ debug*/
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
-			g2.setColor( getBackground( c, isIntelliJTheme, focusedBackground ) );
+			g2.setColor( getBackground( c, focusedBackground ) );
 			FlatUIUtils.paintComponentBackground( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
 		} finally {
 			g2.dispose();
 		}
 	}
 
-	static Color getBackground( JTextComponent c, boolean isIntelliJTheme, Color focusedBackground ) {
+	static Color getBackground( JTextComponent c, Color focusedBackground ) {
 		Color background = c.getBackground();
 
 		// always use explicitly set color
@@ -461,10 +459,6 @@ debug*/
 		if( focusedBackground != null && FlatUIUtils.isPermanentFocusOwner( c ) )
 			return focusedBackground;
 
-		// for compatibility with IntelliJ themes
-		if( isIntelliJTheme && (!c.isEnabled() || !c.isEditable()) )
-			return FlatUIUtils.getParentBackground( c );
-
 		return background;
 	}
 
@@ -487,10 +481,22 @@ debug*/
 		// compute placeholder location
 		Rectangle r = getVisibleEditorRect();
 		FontMetrics fm = c.getFontMetrics( c.getFont() );
-		String clippedPlaceholder = JavaCompatibility.getClippedString( c, fm, placeholder, r.width );
-		int x = r.x + (isLeftToRight() ? 0 : r.width - fm.stringWidth( clippedPlaceholder ));
+		int x = r.x;
 		int y = r.y + fm.getAscent() + ((r.height - fm.getHeight()) / 2);
 
+		// apply horizontal alignment to x location
+		String clippedPlaceholder = JavaCompatibility.getClippedString( c, fm, placeholder, r.width );
+		int stringWidth = fm.stringWidth( clippedPlaceholder );
+		int halign = (c instanceof JTextField) ? ((JTextField)c).getHorizontalAlignment() : SwingConstants.LEADING;
+		if( halign == SwingConstants.LEADING )
+			halign = isLeftToRight() ? SwingConstants.LEFT : SwingConstants.RIGHT;
+		else if( halign == SwingConstants.TRAILING )
+			halign = isLeftToRight() ? SwingConstants.RIGHT : SwingConstants.LEFT;
+		if( halign == SwingConstants.RIGHT )
+			x += r.width - stringWidth;
+		else if( halign == SwingConstants.CENTER )
+			x = Math.max( 0, x + (r.width / 2) - (stringWidth / 2) );
+
 		// paint placeholder
 		g.setColor( placeholderForeground );
 		FlatUIUtils.drawString( c, g, clippedPlaceholder, x, y );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTextPaneUI.java

@@ -56,7 +56,6 @@ import com.formdev.flatlaf.util.LoggingFacade;
  * <!-- FlatTextPaneUI -->
  *
  * @uiDefault Component.minimumWidth			int
- * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault TextPane.focusedBackground		Color	optional
  *
  * @author Karl Tauber
@@ -66,7 +65,6 @@ public class FlatTextPaneUI
 	implements StyleableUI
 {
 	@Styleable protected int minimumWidth;
-	protected boolean isIntelliJTheme;
 	private Color background;
 	@Styleable protected Color disabledBackground;
 	@Styleable protected Color inactiveBackground;
@@ -98,7 +96,6 @@ public class FlatTextPaneUI
 
 		String prefix = getPropertyPrefix();
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		background = UIManager.getColor( prefix + ".background" );
 		disabledBackground = UIManager.getColor( prefix + ".disabledBackground" );
 		inactiveBackground = UIManager.getColor( prefix + ".inactiveBackground" );
@@ -220,6 +217,6 @@ public class FlatTextPaneUI
 
 	@Override
 	protected void paintBackground( Graphics g ) {
-		FlatEditorPaneUI.paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
+		FlatEditorPaneUI.paintBackground( g, getComponent(), focusedBackground );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java

@@ -36,6 +36,7 @@ import java.awt.Rectangle;
 import java.awt.Toolkit;
 import java.awt.Window;
 import java.awt.event.ActionListener;
+import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
 import java.awt.event.ComponentListener;
 import java.awt.event.MouseEvent;
@@ -46,9 +47,9 @@ import java.awt.event.WindowEvent;
 import java.awt.geom.AffineTransform;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
+import java.util.function.Function;
 import javax.accessibility.AccessibleContext;
 import javax.swing.BorderFactory;
 import javax.swing.Box;
@@ -65,6 +66,7 @@ import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.border.AbstractBorder;
 import javax.swing.border.Border;
+import javax.swing.plaf.ComponentUI;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatSystemProperties;
 import com.formdev.flatlaf.ui.FlatNativeWindowBorder.WindowTopBorder;
@@ -96,7 +98,7 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault TitlePane.centerTitleIfMenuBarEmbedded		boolean
  * @uiDefault TitlePane.showIconBesideTitle					boolean
  * @uiDefault TitlePane.menuBarTitleGap						int
- * @uiDefault TitlePane.menuBarResizeHeight					int
+ * @uiDefault TitlePane.menuBarTitleMinimumGap				int
  * @uiDefault TitlePane.closeIcon							Icon
  * @uiDefault TitlePane.iconifyIcon							Icon
  * @uiDefault TitlePane.maximizeIcon						Icon
@@ -107,31 +109,32 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatTitlePane
 	extends JComponent
 {
-	private static final String KEY_DEBUG_SHOW_RECTANGLES = "FlatLaf.debug.titlebar.showRectangles";
+	static final String KEY_DEBUG_SHOW_RECTANGLES = "FlatLaf.debug.titlebar.showRectangles";
+	private static final boolean isWindows_10 = SystemInfo.isWindows_10_orLater && !SystemInfo.isWindows_11_orLater;
 
-	/** @since 2.5 */ protected final Font titleFont = UIManager.getFont( "TitlePane.font" );
-	protected final Color activeBackground = UIManager.getColor( "TitlePane.background" );
-	protected final Color inactiveBackground = UIManager.getColor( "TitlePane.inactiveBackground" );
-	protected final Color activeForeground = UIManager.getColor( "TitlePane.foreground" );
-	protected final Color inactiveForeground = UIManager.getColor( "TitlePane.inactiveForeground" );
-	protected final Color embeddedForeground = UIManager.getColor( "TitlePane.embeddedForeground" );
-	protected final Color borderColor = UIManager.getColor( "TitlePane.borderColor" );
+	/** @since 2.5 */ protected final Font titleFont;
+	protected final Color activeBackground;
+	protected final Color inactiveBackground;
+	protected final Color activeForeground;
+	protected final Color inactiveForeground;
+	protected final Color embeddedForeground;
+	protected final Color borderColor;
 
-	/** @since 2 */ protected final boolean showIcon = FlatUIUtils.getUIBoolean( "TitlePane.showIcon", true );
-	/** @since 2.5 */ protected final boolean showIconInDialogs = FlatUIUtils.getUIBoolean( "TitlePane.showIconInDialogs", true );
-	/** @since 2 */ protected final int noIconLeftGap = FlatUIUtils.getUIInt( "TitlePane.noIconLeftGap", 8 );
-	protected final Dimension iconSize = UIManager.getDimension( "TitlePane.iconSize" );
-	/** @since 2.4 */ protected final int titleMinimumWidth = FlatUIUtils.getUIInt( "TitlePane.titleMinimumWidth", 60 );
-	/** @since 2.4 */ protected final int buttonMinimumWidth = FlatUIUtils.getUIInt( "TitlePane.buttonMinimumWidth", 30 );
-	protected final int buttonMaximizedHeight = UIManager.getInt( "TitlePane.buttonMaximizedHeight" );
-	protected final boolean centerTitle = UIManager.getBoolean( "TitlePane.centerTitle" );
-	protected final boolean centerTitleIfMenuBarEmbedded = FlatUIUtils.getUIBoolean( "TitlePane.centerTitleIfMenuBarEmbedded", true );
-	/** @since 2.4 */ protected final boolean showIconBesideTitle = UIManager.getBoolean( "TitlePane.showIconBesideTitle" );
-	protected final int menuBarTitleGap = FlatUIUtils.getUIInt( "TitlePane.menuBarTitleGap", 40 );
-	/** @since 2.4 */ protected final int menuBarTitleMinimumGap = FlatUIUtils.getUIInt( "TitlePane.menuBarTitleMinimumGap", 12 );
-	/** @since 2.4 */ protected final int menuBarResizeHeight = FlatUIUtils.getUIInt( "TitlePane.menuBarResizeHeight", 4 );
+	/** @since 2 */ protected final boolean showIcon;
+	/** @since 2.5 */ protected final boolean showIconInDialogs;
+	/** @since 2 */ protected final int noIconLeftGap;
+	protected final Dimension iconSize;
+	/** @since 2.4 */ protected final int titleMinimumWidth;
+	/** @since 2.4 */ protected final int buttonMinimumWidth;
+	protected final int buttonMaximizedHeight;
+	protected final boolean centerTitle;
+	protected final boolean centerTitleIfMenuBarEmbedded;
+	/** @since 2.4 */ protected final boolean showIconBesideTitle;
+	protected final int menuBarTitleGap;
+	/** @since 2.4 */ protected final int menuBarTitleMinimumGap;
 
 	protected final JRootPane rootPane;
+	protected final String windowStyle;
 
 	protected JPanel leftPanel;
 	protected JLabel iconLabel;
@@ -147,20 +150,81 @@ public class FlatTitlePane
 
 	private final Handler handler;
 
+	/**
+	 * This panel handles mouse events if FlatLaf window decorations are used
+	 * without native window border. E.g. on Linux.
+	 * <p>
+	 * This panel usually has same bounds as the title pane,
+	 * except if fullWindowContent mode is enabled.
+	 * <p>
+	 * This panel is not a child of the title pane.
+	 * Instead it is added by FlatRootPaneUI to the layered pane at a layer
+	 * under the title pane and under the frame content.
+	 * The separation is necessary for fullWindowContent mode, where the title pane
+	 * is layered over the frame content (for title pane buttons), but the mousePanel
+	 * needs to be layered under the frame content so that components on content pane
+	 * can receive mouse events when located in title area.
+	 */
+	final JPanel mouseLayer;
+
+	/**
+	 * This panel paint a border at the top of the window in fullWindowContent mode,
+	 * if FlatLaf window decorations are enabled.
+	 * Only used on Windows 10.
+	 * <p>
+	 * This panel is not a child of the title pane.
+	 * Instead it is added by FlatRootPaneUI to the layered pane at a layer over all other layers.
+	 */
+	final JPanel windowTopBorderLayer;
+
 	public FlatTitlePane( JRootPane rootPane ) {
 		this.rootPane = rootPane;
 
+		Window w = SwingUtilities.getWindowAncestor( rootPane );
+		String defaultWindowStyle = (w != null && w.getType() == Window.Type.UTILITY) ? WINDOW_STYLE_SMALL : null;
+		windowStyle = clientProperty( rootPane, WINDOW_STYLE, defaultWindowStyle, String.class );
+
+		titleFont = FlatUIUtils.getSubUIFont( "TitlePane.font", windowStyle );
+		activeBackground = FlatUIUtils.getSubUIColor( "TitlePane.background", windowStyle );
+		inactiveBackground = FlatUIUtils.getSubUIColor( "TitlePane.inactiveBackground", windowStyle );
+		activeForeground = FlatUIUtils.getSubUIColor( "TitlePane.foreground", windowStyle );
+		inactiveForeground = FlatUIUtils.getSubUIColor( "TitlePane.inactiveForeground", windowStyle );
+		embeddedForeground = FlatUIUtils.getSubUIColor( "TitlePane.embeddedForeground", windowStyle );
+		// not using windowStyle here because TitlePane.borderColor is also used in FlatRootPaneUI
+		borderColor = UIManager.getColor( "TitlePane.borderColor" );
+
+		showIcon = FlatUIUtils.getSubUIBoolean( "TitlePane.showIcon", windowStyle, true );
+		showIconInDialogs = FlatUIUtils.getSubUIBoolean( "TitlePane.showIconInDialogs", windowStyle, true );
+		noIconLeftGap = FlatUIUtils.getSubUIInt( "TitlePane.noIconLeftGap", windowStyle, 8 );
+		iconSize = FlatUIUtils.getSubUIDimension( "TitlePane.iconSize", windowStyle );
+		titleMinimumWidth = FlatUIUtils.getSubUIInt( "TitlePane.titleMinimumWidth", windowStyle, 60 );
+		buttonMinimumWidth = FlatUIUtils.getSubUIInt( "TitlePane.buttonMinimumWidth", windowStyle, 30 );
+		buttonMaximizedHeight = FlatUIUtils.getSubUIInt( "TitlePane.buttonMaximizedHeight", windowStyle, 0 );
+		centerTitle = FlatUIUtils.getSubUIBoolean( "TitlePane.centerTitle", windowStyle, false );
+		centerTitleIfMenuBarEmbedded = FlatUIUtils.getSubUIBoolean( "TitlePane.centerTitleIfMenuBarEmbedded", windowStyle, true );
+		showIconBesideTitle = FlatUIUtils.getSubUIBoolean( "TitlePane.showIconBesideTitle", windowStyle, false );
+		menuBarTitleGap = FlatUIUtils.getSubUIInt( "TitlePane.menuBarTitleGap", windowStyle, 40 );
+		menuBarTitleMinimumGap = FlatUIUtils.getSubUIInt( "TitlePane.menuBarTitleMinimumGap", windowStyle, 12 );
+
+
 		handler = createHandler();
 		setBorder( createTitlePaneBorder() );
 
 		addSubComponents();
 		activeChanged( true );
 
-		addMouseListener( handler );
-		addMouseMotionListener( handler );
+		mouseLayer = new JPanel();
+		mouseLayer.setOpaque( false );
+		mouseLayer.addMouseListener( handler );
+		mouseLayer.addMouseMotionListener( handler );
 
-		// necessary for closing window with double-click on icon
-		iconLabel.addMouseListener( handler );
+		if( isWindows_10 && FlatNativeWindowBorder.isSupported() ) {
+			windowTopBorderLayer = new JPanel();
+			windowTopBorderLayer.setVisible( false );
+			windowTopBorderLayer.setOpaque( false );
+			windowTopBorderLayer.setBorder( FlatUIUtils.nonUIResource( FlatNativeWindowBorder.WindowTopBorder.getInstance() ) );
+		} else
+			windowTopBorderLayer = null;
 
 		applyComponentOrientation( rootPane.getComponentOrientation() );
 	}
@@ -182,8 +246,8 @@ public class FlatTitlePane
 				setUI( new FlatTitleLabelUI() );
 			}
 		};
-		iconLabel.setBorder( new FlatEmptyBorder( UIManager.getInsets( "TitlePane.iconMargins" ) ) );
-		titleLabel.setBorder( new FlatEmptyBorder( UIManager.getInsets( "TitlePane.titleMargins" ) ) );
+		iconLabel.setBorder( new FlatEmptyBorder( FlatUIUtils.getSubUIInsets( "TitlePane.iconMargins", windowStyle ) ) );
+		titleLabel.setBorder( new FlatEmptyBorder( FlatUIUtils.getSubUIInsets( "TitlePane.titleMargins", windowStyle ) ) );
 
 		leftPanel.setLayout( new BoxLayout( leftPanel, BoxLayout.LINE_AXIS ) );
 		leftPanel.setOpaque( false );
@@ -203,6 +267,11 @@ public class FlatTitlePane
 		setLayout( new BorderLayout() {
 			@Override
 			public void layoutContainer( Container target ) {
+				if( isFullWindowContent() ) {
+					super.layoutContainer( target );
+					return;
+				}
+
 				// compute available bounds
 				Insets insets = target.getInsets();
 				int x = insets.left;
@@ -216,7 +285,7 @@ public class FlatTitlePane
 				int titleWidth = w - leftWidth - buttonsWidth;
 				int minTitleWidth = UIScale.scale( titleMinimumWidth );
 
-				// increase minimum width if icon is show besides the title
+				// increase minimum width if icon is shown besides the title
 				Icon icon = titleLabel.getIcon();
 				if( icon != null ) {
 					Insets iconInsets = iconLabel.getInsets();
@@ -264,6 +333,9 @@ public class FlatTitlePane
 							horizontalGlue.getWidth(), titleLabel.getHeight() );
 					}
 				}
+
+				// clear hit-test cache
+				lastCaptionHitTestTime = 0;
 			}
 		} );
 
@@ -307,10 +379,17 @@ public class FlatTitlePane
 			buttonPanel.add( restoreButton );
 		}
 		buttonPanel.add( closeButton );
+
+		ComponentListener l = new ComponentAdapter() {
+			@Override public void componentResized( ComponentEvent e ) { updateFullWindowContentButtonsBoundsProperty(); }
+			@Override public void componentMoved( ComponentEvent e ) { updateFullWindowContentButtonsBoundsProperty(); }
+		};
+		buttonPanel.addComponentListener( l );
+		addComponentListener( l );
 	}
 
 	protected JButton createButton( String iconKey, String accessibleName, ActionListener action ) {
-		JButton button = new JButton( UIManager.getIcon( iconKey ) ) {
+		JButton button = new JButton( FlatUIUtils.getSubUIIcon( iconKey, windowStyle ) ) {
 			@Override
 			public Dimension getMinimumSize() {
 				// allow the button to shrink if space is rare
@@ -360,9 +439,8 @@ public class FlatTitlePane
 
 		if( window instanceof Frame ) {
 			Frame frame = (Frame) window;
-			boolean maximized = ((frame.getExtendedState() & Frame.MAXIMIZED_BOTH) != 0);
 
-			if( maximized &&
+			if( isWindowMaximized() &&
 				!(SystemInfo.isLinux && FlatNativeLinuxLibrary.isWMUtilsSupported( window )) &&
 				rootPane.getClientProperty( "_flatlaf.maximizedBoundsUpToDate" ) == null )
 			{
@@ -387,13 +465,15 @@ public class FlatTitlePane
 
 	/** @since 3 */
 	protected void updateVisibility() {
-		titleLabel.setVisible( clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_TITLE, true ) );
+		boolean isFullWindowContent = isFullWindowContent();
+		leftPanel.setVisible( !isFullWindowContent );
+		titleLabel.setVisible( clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_TITLE, true ) && !isFullWindowContent );
 		closeButton.setVisible( clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_CLOSE, true ) );
 
 		if( window instanceof Frame ) {
 			Frame frame = (Frame) window;
 			boolean maximizable = frame.isResizable() && clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_MAXIMIZE, true );
-			boolean maximized = ((frame.getExtendedState() & Frame.MAXIMIZED_BOTH) != 0);
+			boolean maximized = isWindowMaximized();
 
 			iconifyButton.setVisible( clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_ICONIFFY, true ) );
 			maximizeButton.setVisible( maximizable && !maximized );
@@ -413,7 +493,7 @@ public class FlatTitlePane
 
 		// get window images
 		List<Image> images = null;
-		if( clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_ICON, defaultShowIcon ) ) {
+		if( clientPropertyBoolean( rootPane, TITLE_BAR_SHOW_ICON, defaultShowIcon ) && !isFullWindowContent() ) {
 			images = window.getIconImages();
 			if( images.isEmpty() ) {
 				// search in owners
@@ -438,6 +518,13 @@ public class FlatTitlePane
 		updateNativeTitleBarHeightAndHitTestSpotsLater();
 	}
 
+	void updateFullWindowContentButtonsBoundsProperty() {
+		Rectangle bounds = isFullWindowContent()
+			? new Rectangle( SwingUtilities.convertPoint( buttonPanel, 0, 0, rootPane ), buttonPanel.getSize() )
+			: null;
+		rootPane.putClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_BOUNDS, bounds );
+	}
+
 	@Override
 	public void addNotify() {
 		super.addNotify();
@@ -492,6 +579,11 @@ public class FlatTitlePane
 		window.removeComponentListener( handler );
 	}
 
+	/** @since 3.4 */
+	protected boolean isFullWindowContent() {
+		return FlatRootPaneUI.isFullWindowContent( rootPane );
+	}
+
 	/**
 	 * Returns whether this title pane currently has a visible and embedded menubar.
 	 */
@@ -503,6 +595,9 @@ public class FlatTitlePane
 	 * Returns whether the menubar should be embedded into the title pane.
 	 */
 	protected boolean isMenuBarEmbedded() {
+		if( isFullWindowContent() )
+			return false;
+
 		// not storing value of "TitlePane.menuBarEmbedded" in class to allow changing at runtime
 		return FlatUIUtils.getBoolean( rootPane,
 			FlatSystemProperties.MENUBAR_EMBEDDED,
@@ -578,6 +673,10 @@ public class FlatTitlePane
 		doLayout();
 	}
 
+	void menuBarInvalidate() {
+		menuBarPlaceholder.invalidate();
+	}
+
 	@Override
 	public void paint( Graphics g ) {
 		super.paint( g );
@@ -586,21 +685,45 @@ public class FlatTitlePane
 			return;
 
 		if( debugTitleBarHeight > 0 ) {
+			// title bar height is measured from window top edge
+			int y = SwingUtilities.convertPoint( window, 0, debugTitleBarHeight, this ).y;
 			g.setColor( Color.green );
-			g.drawLine( 0, debugTitleBarHeight, getWidth(), debugTitleBarHeight );
+			g.drawLine( 0, y, getWidth(), y );
 		}
-		if( debugHitTestSpots != null ) {
-			for( Rectangle r : debugHitTestSpots )
-				paintRect( g, Color.red, r );
-		}
-		paintRect( g, Color.cyan, debugCloseButtonBounds );
-		paintRect( g, Color.blue, debugAppIconBounds );
-		paintRect( g, Color.blue, debugMinimizeButtonBounds );
-		paintRect( g, Color.magenta, debugMaximizeButtonBounds );
-		paintRect( g, Color.cyan, debugCloseButtonBounds );
+
+		g.setColor( Color.red );
+		debugPaintComponentWithMouseListener( g, Color.red, rootPane.getLayeredPane(), 0, 0 );
+
+		debugPaintRect( g, Color.blue, debugAppIconBounds );
+		debugPaintRect( g, Color.blue, debugMinimizeButtonBounds );
+		debugPaintRect( g, Color.magenta, debugMaximizeButtonBounds );
+		debugPaintRect( g, Color.cyan, debugCloseButtonBounds );
 	}
 
-	private void paintRect( Graphics g, Color color, Rectangle r ) {
+	private void debugPaintComponentWithMouseListener( Graphics g, Color color, Component c, int x, int y ) {
+		if( !c.isDisplayable() || !c.isVisible() || c == mouseLayer ||
+			c == iconifyButton || c == maximizeButton || c == restoreButton || c == closeButton )
+		  return;
+
+		if( c.getMouseListeners().length > 0 ||
+			c.getMouseMotionListeners().length > 0 ||
+			c.getMouseWheelListeners().length > 0 )
+		{
+			g.drawRect( x, y, c.getWidth(), c.getHeight() );
+			return;
+		}
+
+		if( c instanceof Container ) {
+			Rectangle titlePaneBoundsOnWindow = SwingUtilities.convertRectangle( this, new Rectangle( getSize() ), window );
+			for( Component child : ((Container)c).getComponents() ) {
+				Rectangle compBoundsOnWindow = SwingUtilities.convertRectangle( c, new Rectangle( c.getSize() ), window );
+				if( compBoundsOnWindow.intersects( titlePaneBoundsOnWindow ) )
+					debugPaintComponentWithMouseListener( g, color, child, x + child.getX(), y + child.getY() );
+			}
+		}
+	}
+
+	private void debugPaintRect( Graphics g, Color color, Rectangle r ) {
 		if( r == null )
 			return;
 
@@ -611,6 +734,9 @@ public class FlatTitlePane
 
 	@Override
 	protected void paintComponent( Graphics g ) {
+		if( isFullWindowContent() )
+			return;
+
 		// not storing value of "TitlePane.unifiedBackground" in class to allow changing at runtime
 		g.setColor( (UIManager.getBoolean( "TitlePane.unifiedBackground" ) &&
 				clientPropertyColor( rootPane, TITLE_BAR_BACKGROUND, null ) == null)
@@ -643,7 +769,10 @@ public class FlatTitlePane
 
 	/** @since 2.4 */
 	protected boolean isWindowMaximized() {
-		return window instanceof Frame && (((Frame)window).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0;
+		// Windows and macOS use always MAXIMIZED_BOTH.
+		// Only Linux uses MAXIMIZED_VERT and MAXIMIZED_HORIZ (when dragging window to left or right edge).
+		// (searched jdk source code)
+		return window instanceof Frame && (((Frame)window).getExtendedState() & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_BOTH;
 	}
 
 	/**
@@ -661,8 +790,30 @@ public class FlatTitlePane
 		rootPane.putClientProperty( "_flatlaf.maximizedBoundsUpToDate", true );
 
 		// maximize window
-		if( !FlatNativeWindowBorder.showWindow( frame, FlatNativeWindowBorder.Provider.SW_MAXIMIZE ) )
-			frame.setExtendedState( frame.getExtendedState() | Frame.MAXIMIZED_BOTH );
+		if( !FlatNativeWindowBorder.showWindow( frame, FlatNativeWindowBorder.Provider.SW_MAXIMIZE ) ) {
+			int oldState = frame.getExtendedState();
+			int newState = oldState | Frame.MAXIMIZED_BOTH;
+
+			if( SystemInfo.isLinux ) {
+				// Linux supports vertical and horizontal maximization:
+				//   - dragging a window to left or right edge of screen vertically maximizes
+				//     the window to the left or right half of the screen
+				//   - don't know whether user can do horizontal maximization
+				// (Windows and macOS use only MAXIMIZED_BOTH)
+				//
+				// If a window is maximized vertically or horizontally (but not both),
+				// then Frame.setExtendedState() behaves not as expected on Linux.
+				// E.g. if window state is MAXIMIZED_VERT, calling setExtendedState(MAXIMIZED_BOTH)
+				// changes state to MAXIMIZED_HORIZ. But calling setExtendedState(MAXIMIZED_HORIZ)
+				// changes state from MAXIMIZED_VERT to MAXIMIZED_BOTH.
+				// Seems to be a bug in sun.awt.X11.XNETProtocol.requestState(),
+				// which does some strange state XOR-ing...
+				if( (oldState & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_VERT )
+					newState = (oldState & ~Frame.MAXIMIZED_BOTH) | Frame.MAXIMIZED_HORIZ;
+			}
+
+			frame.setExtendedState( newState );
+		}
 	}
 
 	protected void updateMaximizedBounds() {
@@ -766,8 +917,7 @@ public class FlatTitlePane
 		if( !(window instanceof Frame) || !((Frame)window).isResizable() )
 			return;
 
-		Frame frame = (Frame) window;
-		if( (frame.getExtendedState() & Frame.MAXIMIZED_BOTH) != 0 )
+		if( isWindowMaximized() )
 			restore();
 		else
 			maximize();
@@ -781,10 +931,6 @@ public class FlatTitlePane
 			window.dispatchEvent( new WindowEvent( window, WindowEvent.WINDOW_CLOSING ) );
 	}
 
-	private boolean hasJBRCustomDecoration() {
-		return window != null && JBRCustomDecorations.hasCustomDecoration( window );
-	}
-
 	/**
 	 * Returns whether windows uses native window border and has custom decorations enabled.
 	 */
@@ -792,6 +938,10 @@ public class FlatTitlePane
 		return window != null && FlatNativeWindowBorder.hasCustomDecoration( window );
 	}
 
+	boolean isWindowTopBorderNeeded() {
+		return isWindows_10 && hasNativeCustomDecoration();
+	}
+
 	// used to invoke updateNativeTitleBarHeightAndHitTestSpots() only once from latest invokeLater()
 	private int laterCounter;
 
@@ -812,11 +962,14 @@ public class FlatTitlePane
 			return;
 
 		int titleBarHeight = getHeight();
+		// title bar height must be measured from window top edge
+		// (when window is maximized, window y location is e.g. -11 and window top inset is 11)
+		for( Component c = this; c != window && c != null; c = c.getParent() )
+			titleBarHeight += c.getY();
 		// slightly reduce height so that component receives mouseExit events
 		if( titleBarHeight > 0 )
 			titleBarHeight--;
 
-		List<Rectangle> hitTestSpots = new ArrayList<>();
 		Rectangle appIconBounds = null;
 
 		if( !showIconBesideTitle && iconLabel.isVisible() ) {
@@ -842,10 +995,7 @@ public class FlatTitlePane
 					iconBounds.width += iconInsets.right;
 			}
 
-			if( hasJBRCustomDecoration() )
-				hitTestSpots.add( iconBounds );
-			else
-				appIconBounds = iconBounds;
+			appIconBounds = iconBounds;
 		} else if( showIconBesideTitle && titleLabel.getIcon() != null && titleLabel.getUI() instanceof FlatTitleLabelUI ) {
 			FlatTitleLabelUI ui = (FlatTitleLabelUI) titleLabel.getUI();
 
@@ -873,59 +1023,7 @@ public class FlatTitlePane
 				iconR.width += 2;
 				iconR.height += 2;
 
-				if( hasJBRCustomDecoration() )
-					hitTestSpots.add( iconR );
-				else
-					appIconBounds = iconR;
-			}
-		}
-
-		Rectangle r = getNativeHitTestSpot( buttonPanel );
-		if( r != null )
-			hitTestSpots.add( r );
-
-		JMenuBar menuBar = rootPane.getJMenuBar();
-		if( hasVisibleEmbeddedMenuBar( menuBar ) ) {
-			r = getNativeHitTestSpot( menuBar );
-			if( r != null ) {
-				// if frame is resizable and not maximized, make menu bar hit test spot smaller at top
-				// to have a small area above the menu bar to resize the window
-				if( window instanceof Frame && ((Frame)window).isResizable() && !isWindowMaximized() ) {
-					// limit to 8, because Windows does not use a larger height
-					int resizeHeight = UIScale.scale( Math.min( menuBarResizeHeight, 8 ) );
-					r.y += resizeHeight;
-					r.height -= resizeHeight;
-				}
-
-				int count = menuBar.getComponentCount();
-				for( int i = count - 1; i >= 0; i-- ) {
-					Component c = menuBar.getComponent( i );
-					if( c instanceof Box.Filler ||
-						(c instanceof JComponent && clientPropertyBoolean( (JComponent) c, COMPONENT_TITLE_BAR_CAPTION, false ) ) )
-					{
-						// If menu bar is embedded and contains a horizontal glue or caption component,
-						// then split the hit test spot so that
-						// the glue/caption component area can be used to move the window.
-
-						Point glueLocation = SwingUtilities.convertPoint( c, 0, 0, window );
-						int x2 = glueLocation.x + c.getWidth();
-						Rectangle r2;
-						if( getComponentOrientation().isLeftToRight() ) {
-							r2 = new Rectangle( x2, r.y, (r.x + r.width) - x2, r.height );
-
-							r.width = glueLocation.x - r.x;
-						} else {
-							r2 = new Rectangle( r.x, r.y, glueLocation.x - r.x, r.height );
-
-							r.width = (r.x + r.width) - x2;
-							r.x = x2;
-						}
-						if( r2.width > 0 )
-							hitTestSpots.add( r2 );
-					}
-				}
-
-				hitTestSpots.add( r );
+				appIconBounds = iconR;
 			}
 		}
 
@@ -933,11 +1031,13 @@ public class FlatTitlePane
 		Rectangle maximizeButtonBounds = boundsInWindow( maximizeButton.isVisible() ? maximizeButton : restoreButton );
 		Rectangle closeButtonBounds = boundsInWindow( closeButton );
 
+		// clear hit-test cache
+		lastCaptionHitTestTime = 0;
+
 		FlatNativeWindowBorder.setTitleBarHeightAndHitTestSpots( window, titleBarHeight,
-			hitTestSpots, appIconBounds, minimizeButtonBounds, maximizeButtonBounds, closeButtonBounds );
+			this::captionHitTest, appIconBounds, minimizeButtonBounds, maximizeButtonBounds, closeButtonBounds );
 
 		debugTitleBarHeight = titleBarHeight;
-		debugHitTestSpots = hitTestSpots;
 		debugAppIconBounds = appIconBounds;
 		debugMinimizeButtonBounds = minimizeButtonBounds;
 		debugMaximizeButtonBounds = maximizeButtonBounds;
@@ -952,18 +1052,101 @@ public class FlatTitlePane
 			: null;
 	}
 
-	protected Rectangle getNativeHitTestSpot( JComponent c ) {
-		Dimension size = c.getSize();
-		if( size.width <= 0 || size.height <= 0 )
-			return null;
+	/**
+	 * Returns whether there is a component at the given location, that processes
+	 * mouse events. E.g. buttons, menus, etc.
+	 * <p>
+	 * Note:
+	 * <ul>
+	 *   <li>This method is invoked often when mouse is moved over title bar
+	 *       and should therefore return quickly.
+	 *   <li>This method is invoked on 'AWT-Windows' thread (not 'AWT-EventQueue' thread)
+	 *       while processing Windows messages.
+	 * </ul>
+	 */
+	private boolean captionHitTest( Point pt ) {
+		// Windows invokes this method every ~200ms, even if the mouse has not moved
+		long time = System.currentTimeMillis();
+		if( pt.x == lastCaptionHitTestX && pt.y == lastCaptionHitTestY && time < lastCaptionHitTestTime + 300 ) {
+			lastCaptionHitTestTime = time;
+			return lastCaptionHitTestResult;
+		}
 
-		Point location = SwingUtilities.convertPoint( c, 0, 0, window );
-		Rectangle r = new Rectangle( location, size );
-		return r;
+		// convert pt from window coordinates to layeredPane coordinates
+		Component layeredPane = rootPane.getLayeredPane();
+		int x = pt.x;
+		int y = pt.y;
+		for( Component c = layeredPane; c != window && c != null; c = c.getParent() ) {
+			x -= c.getX();
+			y -= c.getY();
+		}
+
+		lastCaptionHitTestX = pt.x;
+		lastCaptionHitTestY = pt.y;
+		lastCaptionHitTestTime = time;
+		lastCaptionHitTestResult = isTitleBarCaptionAt( layeredPane, x, y );
+		return lastCaptionHitTestResult;
 	}
 
+	private boolean isTitleBarCaptionAt( Component c, int x, int y ) {
+		if( !c.isDisplayable() || !c.isVisible() || !c.contains( x, y ) || c == mouseLayer )
+			return true; // continue checking with next component
+
+		if( c.isEnabled() &&
+			(c.getMouseListeners().length > 0 ||
+			 c.getMouseMotionListeners().length > 0) )
+		{
+			if( !(c instanceof JComponent) )
+				return false; // assume that this is not a caption because the component has mouse listeners
+
+			// check client property boolean value
+			Object caption = ((JComponent)c).getClientProperty( COMPONENT_TITLE_BAR_CAPTION );
+			if( caption instanceof Boolean )
+				return (boolean) caption;
+
+			// if component is not fully layouted, do not invoke function
+			// because it is too dangerous that the function tries to layout the component,
+			// which could cause a dead lock
+			if( !c.isValid() )
+				return false; // assume that this is not a caption because the component has mouse listeners
+
+			if( caption instanceof Function ) {
+				// check client property function value
+				@SuppressWarnings( "unchecked" )
+				Function<Point, Boolean> hitTest = (Function<Point, Boolean>) caption;
+				Boolean result = hitTest.apply( new Point( x, y ) );
+				if( result != null )
+					return result;
+			} else {
+				// check component UI
+				ComponentUI ui = JavaCompatibility2.getUI( (JComponent) c );
+				if( !(ui instanceof TitleBarCaptionHitTest) )
+					return false; // assume that this is not a caption because the component has mouse listeners
+
+				Boolean result = ((TitleBarCaptionHitTest)ui).isTitleBarCaptionAt( x, y );
+				if( result != null )
+					return result;
+			}
+
+			// else continue checking children
+		}
+
+		// check children
+		if( c instanceof Container ) {
+			for( Component child : ((Container)c).getComponents() ) {
+				if( !isTitleBarCaptionAt( child, x - child.getX(), y - child.getY() ) )
+					return false;
+			}
+		}
+		return true;
+	}
+
+	private int lastCaptionHitTestX;
+	private int lastCaptionHitTestY;
+	private long lastCaptionHitTestTime;
+	private boolean lastCaptionHitTestResult;
+
 	private int debugTitleBarHeight;
-	private List<Rectangle> debugHitTestSpots;
 	private Rectangle debugAppIconBounds;
 	private Rectangle debugMinimizeButtonBounds;
 	private Rectangle debugMaximizeButtonBounds;
@@ -986,7 +1169,7 @@ public class FlatTitlePane
 			} else if( borderColor != null && (rootPane.getJMenuBar() == null || !rootPane.getJMenuBar().isVisible()) )
 				insets.bottom += UIScale.scale( 1 );
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() && !isWindowMaximized() )
+			if( isWindowTopBorderNeeded() && !isWindowMaximized() )
 				insets = FlatUIUtils.addInsets( insets, WindowTopBorder.getInstance().getBorderInsets() );
 
 			return insets;
@@ -1005,7 +1188,7 @@ public class FlatTitlePane
 				FlatUIUtils.paintFilledRectangle( g, borderColor, x, y + height - lineHeight, width, lineHeight );
 			}
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() && !isWindowMaximized() )
+			if( isWindowTopBorderNeeded() && !isWindowMaximized() && !isFullWindowContent() )
 				WindowTopBorder.getInstance().paintBorder( c, g, x, y, width, height );
 		}
 
@@ -1061,7 +1244,7 @@ public class FlatTitlePane
 				}
 			}
 
-			// compute icon width and gap (if icon is show besides the title)
+			// compute icon width and gap (if icon is shown besides the title)
 			int iconTextGap = 0;
 			int iconWidthAndGap = 0;
 			if( icon != null ) {
@@ -1070,7 +1253,7 @@ public class FlatTitlePane
 				iconWidthAndGap = icon.getIconWidth() + iconTextGap;
 			}
 
-			// layout title and icon (if show besides the title)
+			// layout title and icon (if shown besides the title)
 			String clippedText = SwingUtilities.layoutCompoundLabel( label, fontMetrics, text, icon,
 				label.getVerticalAlignment(), label.getHorizontalAlignment(),
 				label.getVerticalTextPosition(), label.getHorizontalTextPosition(),
@@ -1169,7 +1352,7 @@ public class FlatTitlePane
 			activeChanged( true );
 			updateNativeTitleBarHeightAndHitTestSpots();
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() )
+			if( isWindowTopBorderNeeded() )
 				WindowTopBorder.getInstance().repaintBorder( FlatTitlePane.this );
 
 			repaintWindowBorder();
@@ -1180,7 +1363,7 @@ public class FlatTitlePane
 			activeChanged( false );
 			updateNativeTitleBarHeightAndHitTestSpots();
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() )
+			if( isWindowTopBorderNeeded() )
 				WindowTopBorder.getInstance().repaintBorder( FlatTitlePane.this );
 
 			repaintWindowBorder();
@@ -1188,6 +1371,13 @@ public class FlatTitlePane
 
 		@Override
 		public void windowStateChanged( WindowEvent e ) {
+/*debug
+			System.out.println( "state " + e.getOldState() + " -> " + e.getNewState() + "     "
+				+ ((e.getNewState() & Frame.MAXIMIZED_HORIZ) != 0 ? " HORIZ" : "")
+				+ ((e.getNewState() & Frame.MAXIMIZED_VERT) != 0 ? " VERT" : "")
+			);
+debug*/
+
 			frameStateChanged();
 			updateNativeTitleBarHeightAndHitTestSpots();
 		}
@@ -1195,15 +1385,15 @@ public class FlatTitlePane
 		//---- interface MouseListener ----
 
 		private Point dragOffset;
-		private boolean nativeMove;
+		private boolean linuxNativeMove;
 		private long lastSingleClickWhen;
 
 		@Override
 		public void mouseClicked( MouseEvent e ) {
 			// on Linux, when using native library, the mouse clicked event
 			// is usually not sent and maximize/restore is done in mouse pressed event
-			// this check is here for the case that a mouse clicked event comes thru for some reason
-			if( SystemInfo.isLinux && FlatNativeLinuxLibrary.isWMUtilsSupported( window ) ) {
+			// this check is here for the case that a mouse clicked event comes through for some reason
+			if( linuxNativeMove && SystemInfo.isLinux && FlatNativeLinuxLibrary.isWMUtilsSupported( window ) ) {
 				// see comment in mousePressed()
 				if( lastSingleClickWhen != 0 && (e.getWhen() - lastSingleClickWhen) <= getMultiClickInterval() ) {
 					lastSingleClickWhen = 0;
@@ -1213,7 +1403,7 @@ public class FlatTitlePane
 			}
 
 			if( e.getClickCount() == 2 && SwingUtilities.isLeftMouseButton( e ) ) {
-				if( e.getSource() == iconLabel ) {
+				if( SwingUtilities.getDeepestComponentAt( FlatTitlePane.this, e.getX(), e.getY() ) == iconLabel ) {
 					// double-click on icon closes window
 					close();
 				} else if( !hasNativeCustomDecoration() ) {
@@ -1240,8 +1430,8 @@ public class FlatTitlePane
 			if( !SwingUtilities.isLeftMouseButton( e ) )
 				return;
 
-			dragOffset = SwingUtilities.convertPoint( FlatTitlePane.this, e.getPoint(), window );
-			nativeMove = false;
+			dragOffset = SwingUtilities.convertPoint( mouseLayer, e.getPoint(), window );
+			linuxNativeMove = false;
 
 			// on Linux, move or maximize/restore window
 			if( SystemInfo.isLinux && FlatNativeLinuxLibrary.isWMUtilsSupported( window ) ) {
@@ -1261,7 +1451,7 @@ public class FlatTitlePane
 					case 1:
 						// move window via _NET_WM_MOVERESIZE message
 						e.consume();
-						nativeMove = FlatNativeLinuxLibrary.moveOrResizeWindow( window, e, FlatNativeLinuxLibrary.MOVE );
+						linuxNativeMove = FlatNativeLinuxLibrary.moveOrResizeWindow( window, e, FlatNativeLinuxLibrary.MOVE );
 						lastSingleClickWhen = e.getWhen();
 						break;
 
@@ -1291,7 +1481,7 @@ public class FlatTitlePane
 			if( window == null || dragOffset == null )
 				return; // should newer occur
 
-			if( nativeMove )
+			if( linuxNativeMove )
 				return;
 
 			if( !SwingUtilities.isLeftMouseButton( e ) )
@@ -1353,4 +1543,27 @@ public class FlatTitlePane
 		@Override public void componentMoved( ComponentEvent e ) {}
 		@Override public void componentHidden( ComponentEvent e ) {}
 	}
+
+	//---- interface TitleBarCaptionHitTest -----------------------------------
+
+	/**
+	 * For custom components use {@link FlatClientProperties#COMPONENT_TITLE_BAR_CAPTION}
+	 * instead of this interface.
+	 *
+	 * @since 3.4
+	 */
+	public interface TitleBarCaptionHitTest {
+		/**
+		 * Invoked for a component that is enabled and has mouse listeners,
+		 * to check whether it processes mouse input at the given x/y location.
+		 * Useful for components that do not use mouse input on whole component bounds.
+		 * E.g. a tabbed pane with a few tabs has some empty space beside the tabs
+		 * that can be used to move the window.
+		 *
+		 * @return {@code true} if the component is not interested in mouse input at the given location
+		 *         {@code false} if the component wants process mouse input at the given location
+		 *         {@code null} if the component children should be checked
+		 */
+		Boolean isTitleBarCaptionAt( int x, int y );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatToolBarSeparatorUI.java

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
@@ -173,6 +174,12 @@ public class FlatToolBarSeparatorUI
 		if( size != null )
 			return scale( size );
 
+		// get separator width
+		int separatorWidth = this.separatorWidth;
+		FlatToolBarUI toolBarUI = getToolBarUI( c );
+		if( toolBarUI != null && toolBarUI.separatorWidth != null )
+			separatorWidth = toolBarUI.separatorWidth;
+
 		// make sure that gap on left and right side of line have same size
 		int sepWidth = (scale( (separatorWidth - LINE_WIDTH) / 2 ) * 2) + scale( LINE_WIDTH );
 
@@ -196,6 +203,12 @@ public class FlatToolBarSeparatorUI
 		float lineWidth = scale( 1f );
 		float offset = scale( 2f );
 
+		// get separator color
+		Color separatorColor = this.separatorColor;
+		FlatToolBarUI toolBarUI = getToolBarUI( c );
+		if( toolBarUI != null && toolBarUI.separatorColor != null )
+			separatorColor = toolBarUI.separatorColor;
+
 		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
 		g.setColor( separatorColor );
 
@@ -210,4 +223,11 @@ public class FlatToolBarSeparatorUI
 	private boolean isVertical( JComponent c ) {
 		return ((JToolBar.Separator)c).getOrientation() == SwingConstants.VERTICAL;
 	}
+
+	private FlatToolBarUI getToolBarUI( JComponent c ) {
+		Container parent = c.getParent();
+		return (parent instanceof JToolBar && ((JToolBar)parent).getUI() instanceof FlatToolBarUI)
+			? (FlatToolBarUI) ((JToolBar)parent).getUI()
+			: null;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatToolBarUI.java

@@ -39,10 +39,12 @@ import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JToolBar;
 import javax.swing.LayoutFocusTraversalPolicy;
+import javax.swing.RootPaneContainer;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicToolBarUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.LoggingFacade;
@@ -80,7 +82,7 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatToolBarUI
 	extends BasicToolBarUI
-	implements StyleableUI
+	implements StyleableUI, FlatTitlePane.TitleBarCaptionHitTest
 {
 	/** @since 1.4 */ @Styleable protected boolean focusableButtons;
 	/** @since 2 */ @Styleable protected boolean arrowKeysOnlyNavigation;
@@ -91,6 +93,10 @@ public class FlatToolBarUI
 	@Styleable protected Insets borderMargins;
 	@Styleable protected Color gripColor;
 
+	// for FlatToolBarSeparatorUI
+	/** @since 3.3 */ @Styleable protected Integer separatorWidth;
+	/** @since 3.3 */ @Styleable protected Color separatorColor;
+
 	private FocusTraversalPolicy focusTraversalPolicy;
 	private Boolean oldFloatable;
 	private Map<String, Object> oldStyleValues;
@@ -156,6 +162,13 @@ public class FlatToolBarUI
 		}
 	}
 
+	@Override
+	protected RootPaneContainer createFloatingWindow( JToolBar toolbar ) {
+		RootPaneContainer floatingWindow = super.createFloatingWindow( toolbar );
+		floatingWindow.getRootPane().putClientProperty( FlatClientProperties.WINDOW_STYLE, FlatClientProperties.WINDOW_STYLE_SMALL );
+		return floatingWindow;
+	}
+
 	@Override
 	protected ContainerListener createToolBarContListener() {
 		return new ToolBarContListener() {
@@ -440,6 +453,15 @@ public class FlatToolBarUI
 			: null;
 	}
 
+	//---- interface FlatTitlePane.TitleBarCaptionHitTest ----
+
+	/** @since 3.4 */
+	@Override
+	public Boolean isTitleBarCaptionAt( int x, int y ) {
+		// necessary because BasicToolBarUI adds some mouse listeners for dragging when toolbar is floatable
+		return null; // check children
+	}
+
 	//---- class FlatToolBarFocusTraversalPolicy ------------------------------
 
 	/**

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTreeUI.java

@@ -158,6 +158,10 @@ public class FlatTreeUI
 	// only used via styling (not in UI defaults, but has likewise client properties)
 	/** @since 2 */ @Styleable protected boolean paintSelection = true;
 
+	private Icon defaultLeafIcon;
+	private Icon defaultClosedIcon;
+	private Icon defaultOpenIcon;
+
 	private boolean paintLines;
 	private Color defaultCellNonSelectionBackground;
 	private Color defaultSelectionBackground;
@@ -193,6 +197,10 @@ public class FlatTreeUI
 		showCellFocusIndicator = UIManager.getBoolean( "Tree.showCellFocusIndicator" );
 		showDefaultIcons = UIManager.getBoolean( "Tree.showDefaultIcons" );
 
+		defaultLeafIcon = UIManager.getIcon( "Tree.leafIcon" );
+		defaultClosedIcon = UIManager.getIcon( "Tree.closedIcon" );
+		defaultOpenIcon = UIManager.getIcon( "Tree.openIcon" );
+
 		paintLines = UIManager.getBoolean( "Tree.paintLines" );
 		defaultCellNonSelectionBackground = UIManager.getColor( "Tree.textBackground" );
 		defaultSelectionBackground = selectionBackground;
@@ -219,6 +227,10 @@ public class FlatTreeUI
 		selectionInactiveForeground = null;
 		selectionBorderColor = null;
 
+		defaultLeafIcon = null;
+		defaultClosedIcon = null;
+		defaultOpenIcon = null;
+
 		defaultCellNonSelectionBackground = null;
 		defaultSelectionBackground = null;
 		defaultSelectionForeground = null;
@@ -233,9 +245,14 @@ public class FlatTreeUI
 		// remove default leaf/closed/opened icons
 		if( !showDefaultIcons && currentCellRenderer instanceof DefaultTreeCellRenderer ) {
 			DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) currentCellRenderer;
-			renderer.setLeafIcon( null );
-			renderer.setClosedIcon( null );
-			renderer.setOpenIcon( null );
+			if( renderer.getLeafIcon() == defaultLeafIcon &&
+				renderer.getClosedIcon() == defaultClosedIcon &&
+				renderer.getOpenIcon() == defaultOpenIcon )
+			{
+				renderer.setLeafIcon( null );
+				renderer.setClosedIcon( null );
+				renderer.setOpenIcon( null );
+			}
 		}
 	}
 
@@ -310,6 +327,21 @@ public class FlatTreeUI
 						tree.revalidate();
 						tree.repaint();
 						break;
+
+					case "enabled":
+						// if default icons are not shown and the renderer is a subclass
+						// of DefaultTreeCellRenderer, then invalidate tree node sizes
+						// because the custom renderer may use an icon for enabled state
+						// but none for disabled state
+						if( !showDefaultIcons &&
+							currentCellRenderer instanceof DefaultTreeCellRenderer &&
+							currentCellRenderer.getClass() != DefaultTreeCellRenderer.class &&
+							treeState != null )
+						{
+							treeState.invalidateSizes();
+							updateSize();
+						}
+						break;
 				}
 			}
 		};
@@ -388,6 +420,9 @@ public class FlatTreeUI
 
 	/** @since 2 */
 	protected Object applyStyleProperty( String key, Object value ) {
+		if( "rowHeight".equals( key ) && value instanceof Integer )
+			value = UIScale.scale( (Integer) value );
+
 		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, tree, key, value );
 	}
 
@@ -543,7 +578,7 @@ public class FlatTreeUI
 			if( isSelected && isWideSelection() ) {
 				Color oldColor = g.getColor();
 				g.setColor( selectionInactiveBackground );
-				paintWideSelection( g, clipBounds, insets, bounds, path, row, isExpanded, hasBeenExpanded, isLeaf );
+				paintWideSelection( g, bounds, row );
 				g.setColor( oldColor );
 			}
 			return;
@@ -601,7 +636,7 @@ public class FlatTreeUI
 
 			if( isWideSelection() ) {
 				// wide selection
-				paintWideSelection( g, clipBounds, insets, bounds, path, row, isExpanded, hasBeenExpanded, isLeaf );
+				paintWideSelection( g, bounds, row );
 			} else {
 				// non-wide selection
 				paintCellBackground( g, rendererComponent, bounds, row, true );
@@ -670,9 +705,7 @@ public class FlatTreeUI
 		return oldColor;
 	}
 
-	private void paintWideSelection( Graphics g, Rectangle clipBounds, Insets insets, Rectangle bounds,
-		TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf )
-	{
+	private void paintWideSelection( Graphics g, Rectangle bounds, int row ) {
 		float arcTop, arcBottom;
 		arcTop = arcBottom = UIScale.scale( selectionArc / 2f );
 
@@ -695,7 +728,7 @@ public class FlatTreeUI
 
 		if( rendererComponent instanceof JLabel ) {
 			JLabel label = (JLabel) rendererComponent;
-			Icon icon = label.getIcon();
+			Icon icon = label.isEnabled() ? label.getIcon() : label.getDisabledIcon();
 			imageOffset = (icon != null && label.getText() != null)
 				? icon.getIconWidth() + Math.max( label.getIconTextGap() - 1, 0 )
 				: 0;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIAction.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2024 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.beans.PropertyChangeListener;
+import javax.swing.Action;
+
+/**
+ * Base class for UI actions used in ActionMap.
+ * (similar to class sun.swing.UIAction)
+ *
+ * @author Karl Tauber
+ * @since 3.4
+ */
+public abstract class FlatUIAction
+	implements Action
+{
+	protected final String name;
+	protected final Action delegate;
+
+	protected FlatUIAction( String name ) {
+		this.name = name;
+		this.delegate = null;
+	}
+
+	protected FlatUIAction( Action delegate ) {
+		this.name = null;
+		this.delegate = delegate;
+	}
+
+	@Override
+	public Object getValue( String key ) {
+		if( key == NAME && delegate == null )
+			return name;
+		return (delegate != null) ? delegate.getValue( key ) : null;
+	}
+
+	@Override
+	public boolean isEnabled() {
+		return (delegate != null) ? delegate.isEnabled() : true;
+	}
+
+	// do nothing in following methods because this class is immutable
+	@Override public void putValue( String key, Object value ) {}
+	@Override public void setEnabled( boolean b ) {}
+	@Override public void addPropertyChangeListener( PropertyChangeListener listener ) {}
+	@Override public void removePropertyChangeListener( PropertyChangeListener listener ) {}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIUtils.java

@@ -46,6 +46,7 @@ import java.util.IdentityHashMap;
 import java.util.WeakHashMap;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
+import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JScrollPane;
 import javax.swing.JTable;
@@ -59,6 +60,7 @@ import javax.swing.border.Border;
 import javax.swing.border.CompoundBorder;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
+import javax.swing.tree.DefaultTreeCellEditor;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatIntelliJLaf;
 import com.formdev.flatlaf.FlatLaf;
@@ -166,6 +168,88 @@ public class FlatUIUtils
 		return defaultValue;
 	}
 
+	/** @since 3.2 */
+	public static Color getSubUIColor( String key, String subKey ) {
+		if( subKey != null ) {
+			Color value = UIManager.getColor( buildSubKey( key, subKey ) );
+			if( value != null )
+				return value;
+		}
+		return UIManager.getColor( key );
+	}
+
+	/** @since 3.2 */
+	public static boolean getSubUIBoolean( String key, String subKey, boolean defaultValue ) {
+		if( subKey != null ) {
+			Object value = UIManager.get( buildSubKey( key, subKey ) );
+			if( value instanceof Boolean )
+				return (Boolean) value;
+		}
+		return getUIBoolean( key, defaultValue );
+	}
+
+	/** @since 3.2 */
+	public static int getSubUIInt( String key, String subKey, int defaultValue ) {
+		if( subKey != null ) {
+			Object value = UIManager.get( buildSubKey( key, subKey ) );
+			if( value instanceof Integer )
+				return (Integer) value;
+		}
+		return getUIInt( key, defaultValue );
+	}
+
+	/** @since 3.2 */
+	public static Insets getSubUIInsets( String key, String subKey ) {
+		if( subKey != null ) {
+			Insets value = UIManager.getInsets( buildSubKey( key, subKey ) );
+			if( value != null )
+				return value;
+		}
+		return UIManager.getInsets( key );
+	}
+
+	/** @since 3.2 */
+	public static Dimension getSubUIDimension( String key, String subKey ) {
+		if( subKey != null ) {
+			Dimension value = UIManager.getDimension( buildSubKey( key, subKey ) );
+			if( value != null )
+				return value;
+		}
+		return UIManager.getDimension( key );
+	}
+
+	/** @since 3.2 */
+	public static Icon getSubUIIcon( String key, String subKey ) {
+		if( subKey != null ) {
+			Icon value = UIManager.getIcon( buildSubKey( key, subKey ) );
+			if( value != null )
+				return value;
+		}
+		return UIManager.getIcon( key );
+	}
+
+	/** @since 3.2 */
+	public static Font getSubUIFont( String key, String subKey ) {
+		if( subKey != null ) {
+			Font value = UIManager.getFont( buildSubKey( key, subKey ) );
+			if( value != null )
+				return value;
+		}
+		return UIManager.getFont( key );
+	}
+
+	/**
+	 * Inserts {@code subKey} at last dot in {@code key}.
+	 * <p>
+	 * E.g. {@code buildSubKey( "TitlePane.font", "small" )} returns {@code "TitlePane.small.font"}.
+	 */
+	private static String buildSubKey( String key, String subKey ) {
+		int dot = key.lastIndexOf( '.' );
+		return (dot >= 0)
+			? key.substring( 0, dot ) + '.' + subKey + '.' + key.substring( dot + 1 )
+			: key;
+	}
+
 	/** @since 1.1.2 */
 	public static boolean getBoolean( JComponent c, String systemPropertyKey,
 		String clientPropertyKey, String uiKey, boolean defaultValue )
@@ -200,6 +284,10 @@ public class FlatUIUtils
 		return (border instanceof UIResource) ? new NonUIResourceBorder( border ) : border;
 	}
 
+	static Border unwrapNonUIResourceBorder( Border border ) {
+		return (border instanceof NonUIResourceBorder) ? ((NonUIResourceBorder)border).delegate : border;
+	}
+
 	public static int minimumWidth( JComponent c, int minimumWidth ) {
 		return FlatClientProperties.clientPropertyInt( c, FlatClientProperties.MINIMUM_WIDTH, minimumWidth );
 	}
@@ -212,15 +300,14 @@ public class FlatUIUtils
 		if( c == null )
 			return false;
 
-		// check whether used in cell editor (check 3 levels up)
-		Component c2 = c;
-		for( int i = 0; i <= 2 && c2 != null; i++ ) {
-			Container parent = c2.getParent();
-			if( parent instanceof JTable && ((JTable)parent).getEditorComponent() == c2 )
-				return true;
+		// check whether used as table cell editor
+		Container parent = c.getParent();
+		if( parent instanceof JTable && ((JTable)parent).getEditorComponent() == c )
+			return true;
 
-			c2 = parent;
-		}
+		// check whether used as tree cell editor
+		if( parent instanceof DefaultTreeCellEditor.EditorContainer )
+			return true;
 
 		// check whether used as cell editor
 		//   Table.editor is set in JTable.GenericEditor constructor
@@ -647,7 +734,7 @@ public class FlatUIUtils
 	}
 
 	/**
-	 * Creates a (rounded) rectangle used to paint components (border, background, etc).
+	 * Creates a (rounded) rectangle used to paint components (border, background, etc.).
 	 * The given arc diameter is limited to min(width,height).
 	 */
 	public static Shape createComponentRectangle( float x, float y, float w, float h, float arc ) {
@@ -721,7 +808,7 @@ public class FlatUIUtils
 	{
 		dotSize = UIScale.scale( dotSize );
 		gap = UIScale.scale( gap );
-		int gripSize = (dotSize * dotCount) + ((gap * (dotCount - 1)));
+		int gripSize = (dotSize * dotCount) + (gap * (dotCount - 1));
 
 		// calculate grip position
 		float gx;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatViewportUI.java

@@ -18,7 +18,6 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Component;
 import java.awt.Graphics;
-import java.lang.reflect.Method;
 import javax.swing.JComponent;
 import javax.swing.JViewport;
 import javax.swing.plaf.ComponentUI;
@@ -48,14 +47,9 @@ public class FlatViewportUI
 
 		Component view = ((JViewport)c).getView();
 		if( view instanceof JComponent ) {
-			try {
-				Method m = view.getClass().getMethod( "getUI" );
-				Object ui = m.invoke( view );
-				if( ui instanceof ViewportPainter )
-					((ViewportPainter)ui).paintViewport( g, (JComponent) view, (JViewport) c );
-			} catch( Exception ex ) {
-				// ignore
-			}
+			ComponentUI ui = JavaCompatibility2.getUI( (JComponent) view );
+			if( ui instanceof ViewportPainter )
+				((ViewportPainter)ui).paintViewport( g, (JComponent) view, (JViewport) c );
 		}
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowsNativeWindowBorder.java

@@ -29,8 +29,8 @@ import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.Collections;
 import java.util.IdentityHashMap;
-import java.util.List;
 import java.util.Map;
+import java.util.function.Predicate;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.Timer;
@@ -88,12 +88,8 @@ class FlatWindowsNativeWindowBorder
 		if( !SystemInfo.isWindows_10_orLater )
 			return null;
 
-		// requires x86 architecture
-		if( !SystemInfo.isX86 && !SystemInfo.isX86_64 )
-			return null;
-
 		// check whether native library was successfully loaded
-		if( !FlatNativeLibrary.isLoaded() )
+		if( !FlatNativeWindowsLibrary.isLoaded() )
 			return null;
 
 		// create new instance
@@ -163,7 +159,7 @@ class FlatWindowsNativeWindowBorder
 	}
 
 	@Override
-	public void updateTitleBarInfo( Window window, int titleBarHeight, List<Rectangle> hitTestSpots,
+	public void updateTitleBarInfo( Window window, int titleBarHeight, Predicate<Point> captionHitTestCallback,
 		Rectangle appIconBounds, Rectangle minimizeButtonBounds, Rectangle maximizeButtonBounds,
 		Rectangle closeButtonBounds )
 	{
@@ -172,7 +168,7 @@ class FlatWindowsNativeWindowBorder
 			return;
 
 		wndProc.titleBarHeight = titleBarHeight;
-		wndProc.hitTestSpots = hitTestSpots.toArray( new Rectangle[hitTestSpots.size()] );
+		wndProc.captionHitTestCallback = captionHitTestCallback;
 		wndProc.appIconBounds = cloneRectange( appIconBounds );
 		wndProc.minimizeButtonBounds = cloneRectange( minimizeButtonBounds );
 		wndProc.maximizeButtonBounds = cloneRectange( maximizeButtonBounds );
@@ -292,8 +288,8 @@ class FlatWindowsNativeWindowBorder
 		private final long hwnd;
 
 		// Swing coordinates/values may be scaled on a HiDPI screen
-		private int titleBarHeight;
-		private Rectangle[] hitTestSpots;
+		private int titleBarHeight; // measured from window top edge, which may be out-of-screen if maximized
+		private Predicate<Point> captionHitTestCallback;
 		private Rectangle appIconBounds;
 		private Rectangle minimizeButtonBounds;
 		private Rectangle maximizeButtonBounds;
@@ -344,50 +340,61 @@ class FlatWindowsNativeWindowBorder
 		private int onNcHitTest( int x, int y, boolean isOnResizeBorder ) {
 			// scale-down mouse x/y because Swing coordinates/values may be scaled on a HiDPI screen
 			Point pt = scaleDown( x, y );
-			int sx = pt.x;
-			int sy = pt.y;
 
 			// return HTSYSMENU if mouse is over application icon
 			//   - left-click on HTSYSMENU area shows system menu
 			//   - double-left-click sends WM_CLOSE
-			if( contains( appIconBounds, sx, sy ) )
+			if( contains( appIconBounds, pt ) )
 				return HTSYSMENU;
 
 			// return HTMINBUTTON if mouse is over minimize button
 			//   - hovering mouse over HTMINBUTTON area shows tooltip on Windows 10/11
-			if( contains( minimizeButtonBounds, sx, sy ) )
+			if( contains( minimizeButtonBounds, pt ) )
 				return HTMINBUTTON;
 
 			// return HTMAXBUTTON if mouse is over maximize/restore button
 			//   - hovering mouse over HTMAXBUTTON area shows tooltip on Windows 10
 			//   - hovering mouse over HTMAXBUTTON area shows snap layouts menu on Windows 11
 			//     https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/apply-snap-layout-menu
-			if( contains( maximizeButtonBounds, sx, sy ) )
+			if( contains( maximizeButtonBounds, pt ) )
 				return HTMAXBUTTON;
 
 			// return HTCLOSE if mouse is over close button
 			//   - hovering mouse over HTCLOSE area shows tooltip on Windows 10/11
-			if( contains( closeButtonBounds, sx, sy ) )
+			if( contains( closeButtonBounds, pt ) )
 				return HTCLOSE;
 
-			boolean isOnTitleBar = (sy < titleBarHeight);
+			// return HTTOP if mouse is over top resize border
+			//   - hovering mouse shows vertical resize cursor
+			//   - left-click and drag vertically resizes window
+			if( isOnResizeBorder )
+				return HTTOP;
 
+			boolean isOnTitleBar = (pt.y < titleBarHeight);
 			if( isOnTitleBar ) {
-				// use a second reference to the array to avoid that it can be changed
-				// in another thread while processing the array
-				Rectangle[] hitTestSpots2 = hitTestSpots;
-				for( Rectangle spot : hitTestSpots2 ) {
-					if( spot.contains( sx, sy ) )
+				// return HTCLIENT if mouse is over any Swing component in title bar
+				// that processes mouse events (e.g. buttons, menus, etc)
+				//   - Windows ignores mouse events in this area
+				try {
+					if( captionHitTestCallback != null && !captionHitTestCallback.test( pt ) )
 						return HTCLIENT;
+				} catch( Throwable ex ) {
+					// ignore
 				}
-				return isOnResizeBorder ? HTTOP : HTCAPTION;
+
+				// return HTCAPTION if mouse is over title bar
+				//   - right-click shows system menu
+				//   - double-left-click maximizes/restores window size
+				return HTCAPTION;
 			}
 
-			return isOnResizeBorder ? HTTOP : HTCLIENT;
+			// return HTCLIENT
+			//   - Windows ignores mouse events in this area
+			return HTCLIENT;
 		}
 
-		private boolean contains( Rectangle rect, int x, int y ) {
-			return (rect != null && rect.contains( x, y ) );
+		private boolean contains( Rectangle rect, Point pt ) {
+			return (rect != null && rect.contains( pt ) );
 		}
 
 		/**

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FullWindowContentSupport.java

@@ -0,0 +1,219 @@
+/*
+ * Copyright 2024 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Rectangle;
+import java.awt.Window;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.Iterator;
+import javax.swing.JComponent;
+import javax.swing.JRootPane;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * @author Karl Tauber
+ */
+class FullWindowContentSupport
+{
+	private static final String KEY_DEBUG_SHOW_PLACEHOLDERS = "FlatLaf.debug.panel.showPlaceholders";
+
+	private static ArrayList<WeakReference<JComponent>> placeholders = new ArrayList<>();
+
+	static Dimension getPlaceholderPreferredSize( JComponent c, String options ) {
+		JRootPane rootPane;
+		Rectangle bounds;
+
+		if( !options.startsWith( SystemInfo.isMacOS ? "mac" : "win" ) ||
+			!c.isDisplayable() ||
+			(rootPane = SwingUtilities.getRootPane( c )) == null ||
+			(bounds = (Rectangle) rootPane.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_BOUNDS )) == null )
+		  return new Dimension( 0, 0 );
+
+		if( options.length() > 3 ) {
+			if( (options.contains( "leftToRight" ) && !c.getComponentOrientation().isLeftToRight()) ||
+				(options.contains( "rightToLeft" ) && c.getComponentOrientation().isLeftToRight()) )
+			  return new Dimension( 0, 0 );
+		}
+
+		// On macOS, the client property is updated very late when toggling full screen,
+		// which results in "jumping" layout after full screen toggle finished.
+		// To avoid that, get up-to-date buttons bounds from macOS.
+		if( SystemInfo.isMacFullWindowContentSupported && FlatNativeMacLibrary.isLoaded() ) {
+			Rectangle r = FlatNativeMacLibrary.getWindowButtonsBounds( SwingUtilities.windowForComponent( c ) );
+			if( r != null )
+				bounds = r;
+		}
+
+		int width = bounds.width;
+		int height = bounds.height;
+
+		if( options.length() > 3 ) {
+			if( width == 0 && options.contains( "zeroInFullScreen" ) )
+				height = 0;
+
+			if( options.contains( "horizontal" ) )
+				height = 0;
+			if( options.contains( "vertical" ) )
+				width = 0;
+		}
+
+		return new Dimension( width, height );
+	}
+
+	static void registerPlaceholder( JComponent c ) {
+		synchronized( placeholders ) {
+			if( indexOfPlaceholder( c ) < 0 )
+				placeholders.add( new WeakReference<>( c ) );
+		}
+	}
+
+	static void unregisterPlaceholder( JComponent c ) {
+		synchronized( placeholders ) {
+			int index = indexOfPlaceholder( c );
+			if( index >= 0 )
+				placeholders.remove( index );
+		}
+	}
+
+	private static int indexOfPlaceholder( JComponent c ) {
+		int size = placeholders.size();
+		for( int i = 0; i < size; i++ ) {
+			if( placeholders.get( i ).get() == c )
+				return i;
+		}
+		return -1;
+	}
+
+	static void revalidatePlaceholders( Component container ) {
+		synchronized( placeholders ) {
+			if( placeholders.isEmpty() )
+				return;
+
+			for( Iterator<WeakReference<JComponent>> it = placeholders.iterator(); it.hasNext(); ) {
+				WeakReference<JComponent> ref = it.next();
+				JComponent c = ref.get();
+
+				// remove already released placeholder
+				if( c == null ) {
+					it.remove();
+					continue;
+				}
+
+				// revalidate placeholder if is in given container
+				if( SwingUtilities.isDescendingFrom( c, container ) )
+					c.revalidate();
+			}
+		}
+	}
+
+	static ComponentListener macInstallListeners( JRootPane rootPane ) {
+		ComponentListener l = new ComponentAdapter() {
+			boolean lastFullScreen;
+
+			@Override
+			public void componentResized( ComponentEvent e ) {
+				Window window = SwingUtilities.windowForComponent( rootPane );
+				if( window == null )
+					return;
+
+				boolean fullScreen = FlatNativeMacLibrary.isLoaded() && FlatNativeMacLibrary.isWindowFullScreen( window );
+				if( fullScreen == lastFullScreen )
+					return;
+
+				lastFullScreen = fullScreen;
+				macUpdateFullWindowContentButtonsBoundsProperty( rootPane );
+			}
+		};
+
+		rootPane.addComponentListener( l );
+		return l;
+	}
+
+	static void macUninstallListeners( JRootPane rootPane, ComponentListener l ) {
+		if( l != null )
+			rootPane.removeComponentListener( l );
+	}
+
+	static void macUpdateFullWindowContentButtonsBoundsProperty( JRootPane rootPane ) {
+		if( !SystemInfo.isMacFullWindowContentSupported || !rootPane.isDisplayable() )
+			return;
+
+		Rectangle bounds = null;
+		if( FlatClientProperties.clientPropertyBoolean( rootPane, "apple.awt.fullWindowContent", false ) ) {
+			bounds = FlatNativeMacLibrary.isLoaded()
+				? FlatNativeMacLibrary.getWindowButtonsBounds( SwingUtilities.windowForComponent( rootPane ) )
+				: new Rectangle( 68, 28 ); // default size
+		}
+		rootPane.putClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_BOUNDS, bounds );
+	}
+
+	static void macUninstallFullWindowContentButtonsBoundsProperty( JRootPane rootPane ) {
+		if( !SystemInfo.isMacFullWindowContentSupported )
+			return;
+
+		rootPane.putClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_BOUNDS, null );
+	}
+
+	static void debugPaint( Graphics g, JComponent c ) {
+		if( !UIManager.getBoolean( KEY_DEBUG_SHOW_PLACEHOLDERS ) )
+			return;
+
+		int width = c.getWidth();
+		int height = c.getHeight();
+		if( width <= 0 || height <= 0 )
+			return;
+
+		// draw red figure
+		g.setColor( Color.red );
+		debugPaintRect( g, new Rectangle( width, height ) );
+
+		// draw magenta figure if buttons bounds are not equal to placeholder bounds
+		JRootPane rootPane;
+		Rectangle bounds;
+		if( (rootPane = SwingUtilities.getRootPane( c )) != null &&
+			(bounds = (Rectangle) rootPane.getClientProperty( FlatClientProperties.FULL_WINDOW_CONTENT_BUTTONS_BOUNDS )) != null &&
+			(bounds.width != width || bounds.height != height) )
+		{
+			g.setColor( Color.magenta );
+			debugPaintRect( g, SwingUtilities.convertRectangle( rootPane, bounds, c ) );
+		}
+	}
+
+	private static void debugPaintRect( Graphics g, Rectangle r ) {
+		// draw rectangle
+		g.drawRect( r.x, r.y, r.width - 1, r.height - 1 );
+
+		// draw diagonal cross
+		int x2 = r.x + r.width - 1;
+		int y2 = r.y + r.height - 1;
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+		g.drawLine( r.x, r.y, x2, y2 );
+		g.drawLine( r.x, y2, x2, r.y );
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/JBRCustomDecorations.java

@@ -1,306 +0,0 @@
-/*
- * Copyright 2020 FormDev Software GmbH
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.formdev.flatlaf.ui;
-
-import java.awt.Color;
-import java.awt.Component;
-import java.awt.Container;
-import java.awt.EventQueue;
-import java.awt.Graphics;
-import java.awt.Graphics2D;
-import java.awt.Rectangle;
-import java.awt.Toolkit;
-import java.awt.Window;
-import java.awt.event.HierarchyEvent;
-import java.awt.event.HierarchyListener;
-import java.beans.PropertyChangeListener;
-import java.lang.reflect.Method;
-import java.util.Collections;
-import java.util.List;
-import javax.swing.JRootPane;
-import javax.swing.SwingUtilities;
-import javax.swing.UIManager;
-import javax.swing.plaf.BorderUIResource;
-import com.formdev.flatlaf.FlatLaf;
-import com.formdev.flatlaf.util.LoggingFacade;
-import com.formdev.flatlaf.util.HiDPIUtils;
-import com.formdev.flatlaf.util.SystemInfo;
-
-/**
- * Support for custom window decorations provided by JetBrains Runtime (based on OpenJDK).
- * Requires that the application runs on Windows 10 in a JetBrains Runtime 11 or later.
- * <ul>
- *   <li><a href="https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime">https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime</a></li>
- *   <li><a href="https://github.com/JetBrains/JetBrainsRuntime">https://github.com/JetBrains/JetBrainsRuntime</a></li>
- * </ul>
- *
- * @author Karl Tauber
- */
-public class JBRCustomDecorations
-{
-	private static Boolean supported;
-	private static Method Window_hasCustomDecoration;
-	private static Method Window_setHasCustomDecoration;
-	private static Method WWindowPeer_setCustomDecorationTitleBarHeight;
-	private static Method WWindowPeer_setCustomDecorationHitTestSpots;
-	private static Method AWTAccessor_getComponentAccessor;
-	private static Method AWTAccessor_ComponentAccessor_getPeer;
-
-	public static boolean isSupported() {
-		initialize();
-		return supported;
-	}
-
-	static Object install( JRootPane rootPane ) {
-		if( !isSupported() )
-			return null;
-
-		// check whether root pane already has a parent, which is the case when switching LaF
-		Container parent = rootPane.getParent();
-		if( parent != null ) {
-			if( parent instanceof Window )
-				FlatNativeWindowBorder.install( (Window) parent );
-			return null;
-		}
-
-		// Use hierarchy listener to wait until the root pane is added to a window.
-		// Enabling JBR decorations must be done very early, probably before
-		// window becomes displayable (window.isDisplayable()). Tried also using
-		// "ancestor" property change event on root pane, but this is invoked too late.
-		HierarchyListener addListener = new HierarchyListener() {
-			@Override
-			public void hierarchyChanged( HierarchyEvent e ) {
-				if( e.getChanged() != rootPane || (e.getChangeFlags() & HierarchyEvent.PARENT_CHANGED) == 0 )
-					return;
-
-				Container parent = e.getChangedParent();
-				if( parent instanceof Window )
-					FlatNativeWindowBorder.install( (Window) parent );
-
-				// remove listener since it is actually not possible to uninstall JBR decorations
-				// use invokeLater to remove listener to avoid that listener
-				// is removed while listener queue is processed
-				EventQueue.invokeLater( () -> {
-					rootPane.removeHierarchyListener( this );
-				} );
-			}
-		};
-		rootPane.addHierarchyListener( addListener );
-		return addListener;
-	}
-
-	static void uninstall( JRootPane rootPane, Object data ) {
-		// remove listener (if not yet done)
-		if( data instanceof HierarchyListener )
-			rootPane.removeHierarchyListener( (HierarchyListener) data );
-
-		// since it is actually not possible to uninstall JBR decorations,
-		// simply reduce titleBarHeight so that it is still possible to resize window
-		// and remove hitTestSpots
-		Container parent = rootPane.getParent();
-		if( parent instanceof Window )
-			setHasCustomDecoration( (Window) parent, false );
-	}
-
-	static boolean hasCustomDecoration( Window window ) {
-		if( !isSupported() )
-			return false;
-
-		try {
-			return (Boolean) Window_hasCustomDecoration.invoke( window );
-		} catch( Exception ex ) {
-			LoggingFacade.INSTANCE.logSevere( null, ex );
-			return false;
-		}
-	}
-
-	static void setHasCustomDecoration( Window window, boolean hasCustomDecoration ) {
-		if( !isSupported() )
-			return;
-
-		try {
-			if( hasCustomDecoration )
-				Window_setHasCustomDecoration.invoke( window );
-			else
-				setTitleBarHeightAndHitTestSpots( window, 4, Collections.emptyList() );
-		} catch( Exception ex ) {
-			LoggingFacade.INSTANCE.logSevere( null, ex );
-		}
-	}
-
-	static void setTitleBarHeightAndHitTestSpots( Window window, int titleBarHeight, List<Rectangle> hitTestSpots ) {
-		if( !isSupported() )
-			return;
-
-		try {
-			Object compAccessor = AWTAccessor_getComponentAccessor.invoke( null );
-			Object peer = AWTAccessor_ComponentAccessor_getPeer.invoke( compAccessor, window );
-			WWindowPeer_setCustomDecorationTitleBarHeight.invoke( peer, titleBarHeight );
-			WWindowPeer_setCustomDecorationHitTestSpots.invoke( peer, hitTestSpots );
-		} catch( Exception ex ) {
-			LoggingFacade.INSTANCE.logSevere( null, ex );
-		}
-	}
-
-	private static void initialize() {
-		if( supported != null )
-			return;
-		supported = false;
-
-		// requires JetBrains Runtime 11 and Windows 10
-		if( !SystemInfo.isJetBrainsJVM_11_orLater || !SystemInfo.isWindows_10_orLater )
-			return;
-
-		try {
-			Class<?> awtAcessorClass = Class.forName( "sun.awt.AWTAccessor" );
-			Class<?> compAccessorClass = Class.forName( "sun.awt.AWTAccessor$ComponentAccessor" );
-			AWTAccessor_getComponentAccessor = awtAcessorClass.getDeclaredMethod( "getComponentAccessor" );
-			AWTAccessor_ComponentAccessor_getPeer = compAccessorClass.getDeclaredMethod( "getPeer", Component.class );
-
-			Class<?> peerClass = Class.forName( "sun.awt.windows.WWindowPeer" );
-			WWindowPeer_setCustomDecorationTitleBarHeight = peerClass.getDeclaredMethod( "setCustomDecorationTitleBarHeight", int.class );
-			WWindowPeer_setCustomDecorationHitTestSpots = peerClass.getDeclaredMethod( "setCustomDecorationHitTestSpots", List.class );
-			WWindowPeer_setCustomDecorationTitleBarHeight.setAccessible( true );
-			WWindowPeer_setCustomDecorationHitTestSpots.setAccessible( true );
-
-			Window_hasCustomDecoration = Window.class.getDeclaredMethod( "hasCustomDecoration" );
-			Window_setHasCustomDecoration = Window.class.getDeclaredMethod( "setHasCustomDecoration" );
-			Window_hasCustomDecoration.setAccessible( true );
-			Window_setHasCustomDecoration.setAccessible( true );
-
-			supported = true;
-		} catch( Exception ex ) {
-			// ignore
-		}
-	}
-
-	//---- class JBRWindowTopBorder -------------------------------------------
-
-	static class JBRWindowTopBorder
-		extends BorderUIResource.EmptyBorderUIResource
-	{
-		private static JBRWindowTopBorder instance;
-
-		private final Color activeLightColor = new Color( 0x707070 );
-		private final Color activeDarkColor = new Color( 0x2D2E2F );
-		private final Color inactiveLightColor = new Color( 0xaaaaaa );
-		private final Color inactiveDarkColor = new Color( 0x494A4B );
-
-		private boolean colorizationAffectsBorders;
-		private Color activeColor;
-
-		static JBRWindowTopBorder getInstance() {
-			if( instance == null )
-				instance = new JBRWindowTopBorder();
-			return instance;
-		}
-
-        JBRWindowTopBorder() {
-			super( 1, 0, 0, 0 );
-
-			update();
-			installListeners();
-        }
-
-        void update() {
-			colorizationAffectsBorders = isColorizationColorAffectsBorders();
-			activeColor = calculateActiveBorderColor();
-        }
-
-        void installListeners() {
-			Toolkit toolkit = Toolkit.getDefaultToolkit();
-			toolkit.addPropertyChangeListener( "win.dwm.colorizationColor.affects.borders", e -> {
-				colorizationAffectsBorders = isColorizationColorAffectsBorders();
-				activeColor = calculateActiveBorderColor();
-			} );
-
-			PropertyChangeListener l = e -> {
-				activeColor = calculateActiveBorderColor();
-			};
-			toolkit.addPropertyChangeListener( "win.dwm.colorizationColor", l );
-			toolkit.addPropertyChangeListener( "win.dwm.colorizationColorBalance", l );
-			toolkit.addPropertyChangeListener( "win.frame.activeBorderColor", l );
-		}
-
-        boolean isColorizationColorAffectsBorders() {
-			Object value = Toolkit.getDefaultToolkit().getDesktopProperty( "win.dwm.colorizationColor.affects.borders" );
-			return (value instanceof Boolean) ? (Boolean) value : true;
-		}
-
-        Color getColorizationColor() {
-			return (Color) Toolkit.getDefaultToolkit().getDesktopProperty( "win.dwm.colorizationColor" );
-        }
-
-        int getColorizationColorBalance() {
-			Object value = Toolkit.getDefaultToolkit().getDesktopProperty( "win.dwm.colorizationColorBalance" );
-			return (value instanceof Integer) ? (Integer) value : -1;
-        }
-
-		private Color calculateActiveBorderColor() {
-			if( !colorizationAffectsBorders )
-				return null;
-
-			Color colorizationColor = getColorizationColor();
-			if( colorizationColor != null ) {
-				int colorizationColorBalance = getColorizationColorBalance();
-				if( colorizationColorBalance < 0 || colorizationColorBalance > 100 )
-					colorizationColorBalance = 100;
-
-				if( colorizationColorBalance == 0 )
-					return new Color( 0xD9D9D9 );
-				if( colorizationColorBalance == 100 )
-					return colorizationColor;
-
-				float alpha = colorizationColorBalance / 100.0f;
-				float remainder = 1 - alpha;
-				int r = Math.round( colorizationColor.getRed() * alpha + 0xD9 * remainder );
-				int g = Math.round( colorizationColor.getGreen() * alpha + 0xD9 * remainder );
-				int b = Math.round( colorizationColor.getBlue() * alpha + 0xD9 * remainder );
-
-				// avoid potential IllegalArgumentException in Color constructor
-				r = Math.min( Math.max( r, 0 ), 255 );
-				g = Math.min( Math.max( g, 0 ), 255 );
-				b = Math.min( Math.max( b, 0 ), 255 );
-
-				return new Color( r, g, b );
-			}
-
-			Color activeBorderColor = (Color) Toolkit.getDefaultToolkit().getDesktopProperty( "win.frame.activeBorderColor" );
-			return (activeBorderColor != null) ? activeBorderColor : UIManager.getColor( "MenuBar.borderColor" );
-		}
-
-		@Override
-		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
-			Window window = SwingUtilities.windowForComponent( c );
-			boolean active = window != null && window.isActive();
-			boolean dark = FlatLaf.isLafDark();
-
-			g.setColor( active
-				? (activeColor != null ? activeColor : (dark ? activeDarkColor : activeLightColor))
-				: (dark ? inactiveDarkColor : inactiveLightColor) );
-			HiDPIUtils.paintAtScale1x( (Graphics2D) g, x, y, width, height, this::paintImpl );
-		}
-
-		private void paintImpl( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
-			g.fillRect( x, y, width, 1 );
-		}
-
-		void repaintBorder( Component c ) {
-			c.repaint( 0, 0, c.getWidth(), 1 );
-		}
-	}
-}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/JavaCompatibility2.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright 2024 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.io.File;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Method;
+import javax.swing.JComponent;
+import javax.swing.JList;
+import javax.swing.JPanel;
+import javax.swing.JTable;
+import javax.swing.JTree;
+import javax.swing.filechooser.FileSystemView;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Provides Java version compatibility methods.
+ * <p>
+ * WARNING: This is private API and may change.
+ *
+ * @author Karl Tauber
+ * @since 3.3
+ */
+public class JavaCompatibility2
+{
+	private static boolean getUIMethodInitialized;
+	private static MethodHandle getUIMethod;
+
+	/**
+	 * Java 8: getUI() method on various components (e.g. JButton, JList, etc)
+	 * <br>
+	 * Java 9: javax.swing.JComponent.getUI()
+	 */
+	public static ComponentUI getUI( JComponent c ) {
+		try {
+			// Java 9+
+			if( SystemInfo.isJava_9_orLater ) {
+				if( !getUIMethodInitialized ) {
+					getUIMethodInitialized = true;
+
+					try {
+						MethodType mt = MethodType.methodType( ComponentUI.class, new Class[0] );
+						getUIMethod = MethodHandles.publicLookup().findVirtual( JComponent.class, "getUI", mt );
+					} catch( Exception ex ) {
+						// ignore
+						LoggingFacade.INSTANCE.logSevere( null, ex );
+					}
+				}
+
+				if( getUIMethod != null )
+					return (ComponentUI) getUIMethod.invoke( c );
+			}
+
+			// components often used (e.g. as view in scroll panes)
+			if( c instanceof JPanel )
+				return ((JPanel)c).getUI();
+			if( c instanceof JList )
+				return ((JList<?>)c).getUI();
+			if( c instanceof JTable )
+				return ((JTable)c).getUI();
+			if( c instanceof JTree )
+				return ((JTree)c).getUI();
+			if( c instanceof JTextComponent )
+				return ((JTextComponent)c).getUI();
+
+			// Java 8 and fallback
+			Method m = c.getClass().getMethod( "getUI" );
+			return (ComponentUI) m.invoke( c );
+		} catch( Throwable ex ) {
+			// ignore
+			return null;
+		}
+	}
+
+	/**
+	 * Java 8 - 11 on Windows: sun.awt.shell.ShellFolder.get( "fileChooserShortcutPanelFolders" )
+	 * <br>
+	 * Java 12: javax.swing.filechooser.FileSystemView.getChooserShortcutPanelFiles()
+	 *
+	 * @since 3.4
+	 */
+	public static File[] getChooserShortcutPanelFiles( FileSystemView fsv ) {
+		try {
+			if( SystemInfo.isJava_12_orLater ) {
+				Method m = fsv.getClass().getMethod( "getChooserShortcutPanelFiles" );
+				File[] files = (File[]) m.invoke( fsv );
+
+				// on macOS and Linux, files consists only of the user home directory
+				if( files.length == 1 && files[0].equals( new File( System.getProperty( "user.home" ) ) ) )
+					files = new File[0];
+
+				return files;
+			} else if( SystemInfo.isWindows ) {
+				Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
+				Method m = cls.getMethod( "get", String.class );
+				return (File[]) m.invoke( null, "fileChooserShortcutPanelFolders" );
+			}
+		} catch( IllegalAccessException ex ) {
+			// do not log because access may be denied via VM option '--illegal-access=deny'
+		} catch( Exception ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+
+		// fallback
+		return new File[0];
+	}
+
+	/**
+	 * Java 8: sun.awt.shell.ShellFolder.get( "fileChooserComboBoxFolders" )
+	 * <br>
+	 * Java 9: javax.swing.filechooser.FileSystemView.getChooserComboBoxFiles()
+	 *
+	 * @since 3.4
+	 */
+	public static File[] getChooserComboBoxFiles( FileSystemView fsv ) {
+		try {
+			if( SystemInfo.isJava_9_orLater ) {
+				Method m = fsv.getClass().getMethod( "getChooserComboBoxFiles" );
+				return (File[]) m.invoke( fsv );
+			} else {
+				Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
+				Method m = cls.getMethod( "get", String.class );
+				return (File[]) m.invoke( null, "fileChooserComboBoxFolders" );
+			}
+		} catch( IllegalAccessException ex ) {
+			// do not log because access may be denied via VM option '--illegal-access=deny'
+		} catch( Exception ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+
+		// fallback
+		return new File[0];
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/FontUtils.java

@@ -80,7 +80,7 @@ public class FontUtils
 
 	/**
 	 * Loads a font family previously registered via {@link #registerFontFamilyLoader(String, Runnable)}.
-	 * If the family is already loaded or no londer is registered for that family, nothing happens.
+	 * If the family is already loaded or no loader is registered for that family, nothing happens.
 	 */
 	public static void loadFontFamily( String family ) {
 		if( !hasLoaders() )
@@ -109,7 +109,7 @@ public class FontUtils
 	}
 
 	/**
-	 * Returns all font familiy names available in the graphics environment.
+	 * Returns all font family names available in the graphics environment.
 	 * This invokes {@link GraphicsEnvironment#getAvailableFontFamilyNames()} and
 	 * appends families registered for lazy loading via {@link #registerFontFamilyLoader(String, Runnable)}
 	 * to the result.

flatlaf-core/src/main/java/com/formdev/flatlaf/util/Graphics2DProxy.java

@@ -28,7 +28,6 @@ import java.awt.Paint;
 import java.awt.Polygon;
 import java.awt.Rectangle;
 import java.awt.RenderingHints;
-import java.awt.RenderingHints.Key;
 import java.awt.Shape;
 import java.awt.Stroke;
 import java.awt.font.FontRenderContext;
@@ -368,12 +367,12 @@ public class Graphics2DProxy
 	}
 
 	@Override
-	public void setRenderingHint( Key hintKey, Object hintValue ) {
+	public void setRenderingHint( RenderingHints.Key hintKey, Object hintValue ) {
 		delegate.setRenderingHint( hintKey, hintValue );
 	}
 
 	@Override
-	public Object getRenderingHint( Key hintKey ) {
+	public Object getRenderingHint( RenderingHints.Key hintKey ) {
 		return delegate.getRenderingHint( hintKey );
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/util/HiDPIUtils.java

@@ -52,40 +52,47 @@ public class HiDPIUtils
 		AffineTransform t = g.getTransform();
 
 		// get scale X/Y and shear X/Y
-		double scaleX = t.getScaleX();
-		double scaleY = t.getScaleY();
-		double shearX = t.getShearX();
-		double shearY = t.getShearY();
+		final double scaleX = t.getScaleX();
+		final double scaleY = t.getScaleY();
+		final double shearX = t.getShearX();
+		final double shearY = t.getShearY();
 
 		// check whether rotated
 		// (also check for negative scale X/Y because shear X/Y are zero for 180 degrees rotation)
 		boolean rotated = (shearX != 0 || shearY != 0 || scaleX <= 0 || scaleY <= 0);
+
+		// calculate non rotated scale factors
+		final double realScaleX, realScaleY;
 		if( rotated ) {
 			// resulting scale X/Y values are always positive
-			scaleX = Math.hypot( scaleX, shearX );
-			scaleY = Math.hypot( scaleY, shearY );
+			realScaleX = Math.hypot( scaleX, shearX );
+			realScaleY = Math.hypot( scaleY, shearY );
 		} else {
 			// make scale X/Y positive
-			scaleX = Math.abs( scaleX );
-			scaleY = Math.abs( scaleY );
+			realScaleX = Math.abs( scaleX );
+			realScaleY = Math.abs( scaleY );
 		}
 
 		// check whether scaled
-		if( scaleX == 1 && scaleY == 1 ) {
+		if( realScaleX == 1 && realScaleY == 1 ) {
 			painter.paint( g, x, y, width, height, 1 );
 			return;
 		}
 
+		// calculate x and y (this is equal to t.translate( x, y ))
+		double px = (x * scaleX) + (y * shearX) + t.getTranslateX();
+		double py = (y * scaleY) + (x * shearY) + t.getTranslateY();
+
 		// scale rectangle
-		Rectangle2D.Double scaledRect = scale( scaleX, scaleY, t, x, y, width, height );
+		Rectangle2D.Double scaledRect = scale( realScaleX, realScaleY, px, py, width, height );
 
 		try {
 			// unscale to factor 1.0, keep rotation and move origin (to whole numbers)
 			AffineTransform t1x;
 			if( rotated ) {
-				t1x = new AffineTransform( t.getScaleX(), t.getShearY(), t.getShearX(), t.getScaleY(),
+				t1x = new AffineTransform( scaleX, shearY, shearX, scaleY,
 					Math.floor( scaledRect.x ), Math.floor( scaledRect.y ) );
-				t1x.scale( 1. / scaleX, 1. / scaleY );
+				t1x.scale( 1. / realScaleX, 1. / realScaleY );
 			} else
 				t1x = new AffineTransform( 1, 0, 0, 1, Math.floor( scaledRect.x ), Math.floor( scaledRect.y ) );
 			g.setTransform( t1x );
@@ -94,7 +101,7 @@ public class HiDPIUtils
 			int sheight = (int) scaledRect.height;
 
 			// paint
-			painter.paint( g, 0, 0, swidth, sheight, scaleX );
+			painter.paint( g, 0, 0, swidth, sheight, realScaleX );
 		} finally {
 			// restore original transform
 			g.setTransform( t );
@@ -106,10 +113,7 @@ public class HiDPIUtils
 	 * sun.java2d.pipe.PixelToParallelogramConverter.fillRectangle(),
 	 * which is used by Graphics.fillRect().
 	 */
-	private static Rectangle2D.Double scale( double scaleX, double scaleY, AffineTransform t, int x, int y, int width, int height ) {
-		double px = (x * scaleX) + t.getTranslateX();
-		double py = (y * scaleY) + t.getTranslateY();
-
+	private static Rectangle2D.Double scale( double scaleX, double scaleY, double px, double py, int width, int height ) {
 		double newX = normalize( px );
 		double newY = normalize( py );
 		double newWidth  = normalize( px + (width  * scaleX) ) - newX;
@@ -188,7 +192,8 @@ public class HiDPIUtils
 
 				case "Inter":
 				case "Inter Light":
-				case "Inter Semi Bold":
+				case "Inter Semi Bold":	// Inter v3
+				case "Inter SemiBold":	// Inter v4
 				case "Roboto":
 				case "Roboto Light":
 				case "Roboto Medium":

flatlaf-core/src/main/java/com/formdev/flatlaf/util/NativeLibrary.java

@@ -116,7 +116,11 @@ public class NativeLibrary
 		try {
 			// for development environment
 			if( "file".equals( libraryUrl.getProtocol() ) ) {
-				File libraryFile = new File( libraryUrl.getPath() );
+				String binPath = libraryUrl.getPath();
+				String srcPath = binPath.replace( "flatlaf-core/bin/main/", "flatlaf-core/src/main/resources/" );
+				File libraryFile = new File( srcPath ); // use from 'src' folder if available
+				if( !libraryFile.isFile() )
+					libraryFile = new File( binPath ); // use from 'bin' or 'output' folder if available
 				if( libraryFile.isFile() ) {
 					// load library without copying
 					System.load( libraryFile.getCanonicalPath() );

flatlaf-core/src/main/java/com/formdev/flatlaf/util/ScaledImageIcon.java

@@ -100,8 +100,13 @@ debug*/
 		Image image = getResolutionVariant( destImageWidth, destImageHeight );
 
 		// size of image
-		int imageWidth = image.getWidth( null );
-		int imageHeight = image.getHeight( null );
+		int imageWidth = -1;
+		int imageHeight = -1;
+
+		if (image != null) {
+			imageWidth = image.getWidth( null );
+			imageHeight = image.getHeight( null );
+		}
 
 		// paint red rectangle if image has invalid size (e.g. not found)
 		if( imageWidth < 0 || imageHeight < 0 ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/util/SystemInfo.java

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.util;
 
 import java.util.Locale;
 import java.util.StringTokenizer;
+import com.formdev.flatlaf.ui.FlatNativeWindowsLibrary;
 
 /**
  * Provides information about the current system.
@@ -34,9 +35,7 @@ public class SystemInfo
 	// OS versions
 	public static final long osVersion;
 	public static final boolean isWindows_10_orLater;
-	/** <strong>Note</strong>: This requires Java 8u321, 11.0.14, 17.0.2 or 18 (or later).
-	 * (see https://bugs.openjdk.java.net/browse/JDK-8274840)
-	 * @since 2 */ public static final boolean isWindows_11_orLater;
+	/** @since 2 */ public static final boolean isWindows_11_orLater;
 	public static final boolean isMacOS_10_11_ElCapitan_orLater;
 	public static final boolean isMacOS_10_14_Mojave_orLater;
 	public static final boolean isMacOS_10_15_Catalina_orLater;
@@ -80,8 +79,6 @@ public class SystemInfo
 		// OS versions
 		osVersion = scanVersion( System.getProperty( "os.version" ) );
 		isWindows_10_orLater = (isWindows && osVersion >= toVersion( 10, 0, 0, 0 ));
-		isWindows_11_orLater = (isWindows_10_orLater && osName.length() > "windows ".length() &&
-			scanVersion( osName.substring( "windows ".length() ) ) >= toVersion( 11, 0, 0, 0 ));
 		isMacOS_10_11_ElCapitan_orLater = (isMacOS && osVersion >= toVersion( 10, 11, 0, 0 ));
 		isMacOS_10_14_Mojave_orLater = (isMacOS && osVersion >= toVersion( 10, 14, 0, 0 ));
 		isMacOS_10_15_Catalina_orLater = (isMacOS && osVersion >= toVersion( 10, 15, 0, 0 ));
@@ -116,9 +113,27 @@ public class SystemInfo
 
 		// features
 		// available since Java 12; backported to Java 11.0.8 and 8u292
-		isMacFullWindowContentSupported =
-			javaVersion >= toVersion( 11, 0, 8, 0 ) ||
-			(javaVersion >= toVersion( 1, 8, 0, 292 ) && !isJava_9_orLater);
+		isMacFullWindowContentSupported = isMacOS &&
+			(javaVersion >= toVersion( 11, 0, 8, 0 ) ||
+			 (javaVersion >= toVersion( 1, 8, 0, 292 ) && !isJava_9_orLater));
+
+
+		// Note: Keep following at the end of this block because (optional) loading
+		//       of native library uses fields of this class. E.g. isX86_64
+
+		// Windows 11 detection is implemented in Java 8u321, 11.0.14, 17.0.2 and 18 (or later).
+		// (see https://bugs.openjdk.java.net/browse/JDK-8274840)
+		// For older Java versions, use native library to get OS build number.
+		boolean isWin_11_orLater = false;
+		try {
+			isWin_11_orLater = isWindows_10_orLater &&
+				(scanVersion( StringUtils.removeLeading( osName, "windows " ) ) >= toVersion( 11, 0, 0, 0 ) ||
+				 (FlatNativeWindowsLibrary.isLoaded() && FlatNativeWindowsLibrary.getOSBuildNumber() >= 22000));
+		} catch( Throwable ex ) {
+			// catch to avoid that application can not start if native library is not up-to-date
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+		isWindows_11_orLater = isWin_11_orLater;
 	}
 
 	public static long scanVersion( String version ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/util/UIScale.java

@@ -204,7 +204,7 @@ public class UIScale
 		if( SystemInfo.isWindows ) {
 			// Special handling for Windows to be compatible with OS scaling,
 			// which distinguish between "screen scaling" and "text scaling".
-			//  - Windows "screen scaling" scales everything (text, icon, gaps, etc)
+			//  - Windows "screen scaling" scales everything (text, icon, gaps, etc.)
 			//    and may have different scaling factors for each screen.
 			//  - Windows "text scaling" increases only the font size, but on all screens.
 			//

flatlaf-core/src/main/java9/com/formdev/flatlaf/util/MultiResolutionImageSupport.java

@@ -20,9 +20,12 @@ import java.awt.Dimension;
 import java.awt.Image;
 import java.awt.image.AbstractMultiResolutionImage;
 import java.awt.image.BaseMultiResolutionImage;
+import java.awt.image.ImageObserver;
+import java.awt.image.ImageProducer;
 import java.awt.image.MultiResolutionImage;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.IdentityHashMap;
 import java.util.List;
 import java.util.function.Function;
@@ -116,6 +119,26 @@ public class MultiResolutionImageSupport
 			return mapAndCacheImage( mrImage );
 		}
 
+		@Override
+		public int getWidth( ImageObserver observer ) {
+			return mrImage.getWidth( observer );
+		}
+
+		@Override
+		public int getHeight( ImageObserver observer ) {
+			return mrImage.getHeight( observer );
+		}
+
+		@Override
+		public ImageProducer getSource() {
+			return mrImage.getSource();
+		}
+
+		@Override
+		public Object getProperty( String name, ImageObserver observer ) {
+			return mrImage.getProperty( name, observer );
+		}
+
 		private Image mapAndCacheImage( Image image ) {
 			return cache.computeIfAbsent( image, img -> {
 				// using ImageIcon here makes sure that the image is loaded
@@ -134,7 +157,7 @@ public class MultiResolutionImageSupport
 	{
 		private final Dimension[] dimensions;
 		private final Function<Dimension, Image> producer;
-		private final IdentityHashMap<Dimension, Image> cache = new IdentityHashMap<>();
+		private final HashMap<Dimension, Image> cache = new HashMap<>();
 
 		ProducerMultiResolutionImage( Dimension[] dimensions, Function<Dimension, Image> producer ) {
 			this.dimensions = dimensions;
@@ -159,6 +182,16 @@ public class MultiResolutionImageSupport
 			return produceAndCacheImage( dimensions[0] );
 		}
 
+		@Override
+		public int getWidth( ImageObserver observer ) {
+			return dimensions[0].width;
+		}
+
+		@Override
+		public int getHeight( ImageObserver observer ) {
+			return dimensions[0].height;
+		}
+
 		private Image produceAndCacheImage( Dimension size ) {
 			return cache.computeIfAbsent( size, size2 -> {
 				// using ImageIcon here makes sure that the image is loaded

flatlaf-core/src/main/module-info/module-info.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-/**
+/*
  * @author Karl Tauber
  */
 module com.formdev.flatlaf {

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatDarkLaf.properties

@@ -57,7 +57,7 @@
 @menuAcceleratorSelectionForeground = @selectionForeground
 
 # misc
-@cellFocusColor = #000
+@cellFocusColor = lighten(@selectionBackground,10%)
 @icon = shade(@foreground,7%)
 
 # accent colors (blueish)
@@ -246,6 +246,7 @@ PasswordField.revealIconColor = @foreground
 
 #---- Popup ----
 
+[mac]Popup.roundedBorderWidth = 1
 Popup.dropShadowColor = #000
 Popup.dropShadowOpacity = 0.25
 
@@ -331,6 +332,8 @@ Table.gridColor = lighten($Table.background,8%)
 
 #---- TableHeader ----
 
+TableHeader.hoverBackground = lighten($TableHeader.background,5%,derived)
+TableHeader.pressedBackground = lighten($TableHeader.background,10%,derived)
 TableHeader.separatorColor = lighten($TableHeader.background,10%)
 TableHeader.bottomSeparatorColor = $TableHeader.separatorColor
 

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLaf.properties

@@ -288,6 +288,8 @@ ComboBox.buttonPressedArrowColor = @buttonPressedArrowColor
 ComboBox.popupInsets = 0,0,0,0
 ComboBox.selectionInsets = 0,0,0,0
 ComboBox.selectionArc = 0
+ComboBox.borderCornerRadius = $Popup.borderCornerRadius
+[mac]ComboBox.roundedBorderWidth = $Popup.roundedBorderWidth
 
 
 #---- Component ----
@@ -503,6 +505,8 @@ PasswordField.revealIcon = com.formdev.flatlaf.icons.FlatRevealIcon
 
 #---- Popup ----
 
+Popup.borderCornerRadius = 4
+[mac]Popup.roundedBorderWidth = 0
 Popup.dropShadowPainted = true
 Popup.dropShadowInsets = -4,-4,4,4
 
@@ -511,6 +515,8 @@ Popup.dropShadowInsets = -4,-4,4,4
 
 PopupMenu.border = com.formdev.flatlaf.ui.FlatPopupMenuBorder
 PopupMenu.borderInsets = 4,1,4,1
+PopupMenu.borderCornerRadius = $Popup.borderCornerRadius
+[mac]PopupMenu.roundedBorderWidth = $Popup.roundedBorderWidth
 PopupMenu.background = @menuBackground
 PopupMenu.scrollArrowColor = @buttonArrowColor
 
@@ -594,10 +600,15 @@ ScrollBar.allowsAbsolutePositioning = true
 
 #---- ScrollPane ----
 
-ScrollPane.border = com.formdev.flatlaf.ui.FlatBorder
+ScrollPane.border = com.formdev.flatlaf.ui.FlatScrollPaneBorder
 ScrollPane.background = $ScrollBar.track
 ScrollPane.fillUpperCorner = true
 ScrollPane.smoothScrolling = true
+ScrollPane.arc = 0
+#ScrollPane.List.arc = -1
+#ScrollPane.Table.arc = -1
+#ScrollPane.TextComponent.arc = -1
+#ScrollPane.Tree.arc = -1
 
 
 #---- SearchField ----
@@ -668,7 +679,12 @@ SplitPaneDivider.gripGap = 2
 
 TabbedPane.tabHeight = 32
 TabbedPane.tabSelectionHeight = 3
-TabbedPane.cardTabSelectionHeight = 2
+TabbedPane.cardTabSelectionHeight = 3
+TabbedPane.tabArc = 0
+TabbedPane.tabSelectionArc = 0
+TabbedPane.cardTabArc = 12
+TabbedPane.selectedInsets = 0,0,0,0
+TabbedPane.tabSelectionInsets = 0,0,0,0
 TabbedPane.contentSeparatorHeight = 1
 TabbedPane.showTabSeparators = false
 TabbedPane.tabSeparatorsFullHeight = false
@@ -689,6 +705,8 @@ TabbedPane.tabAreaAlignment = leading
 TabbedPane.tabAlignment = center
 # allowed values: preferred, equal or compact
 TabbedPane.tabWidthMode = preferred
+# allowed values: none, auto, left or right
+TabbedPane.tabRotation = none
 
 # allowed values: underlined or card
 TabbedPane.tabType = underlined
@@ -721,9 +739,11 @@ Table.rowHeight = 20
 Table.showHorizontalLines = false
 Table.showVerticalLines = false
 Table.showTrailingVerticalLine = false
+Table.paintOutsideAlternateRows = false
+Table.editorSelectAllOnStartEditing = true
 Table.consistentHomeEndKeyBehavior = true
 Table.intercellSpacing = 0,0
-Table.scrollPaneBorder = com.formdev.flatlaf.ui.FlatBorder
+Table.scrollPaneBorder = com.formdev.flatlaf.ui.FlatScrollPaneBorder
 Table.ascendingSortIcon = com.formdev.flatlaf.icons.FlatAscendingSortIcon
 Table.descendingSortIcon = com.formdev.flatlaf.icons.FlatDescendingSortIcon
 Table.sortIconColor = @icon
@@ -805,12 +825,12 @@ TitlePane.titleMinimumWidth = 60
 TitlePane.buttonSize = 44,30
 TitlePane.buttonMinimumWidth = 30
 TitlePane.buttonMaximizedHeight = 22
+TitlePane.buttonSymbolHeight = 10
 TitlePane.centerTitle = false
 TitlePane.centerTitleIfMenuBarEmbedded = true
 TitlePane.showIconBesideTitle = false
 TitlePane.menuBarTitleGap = 40
 TitlePane.menuBarTitleMinimumGap = 12
-TitlePane.menuBarResizeHeight = 4
 TitlePane.closeIcon = com.formdev.flatlaf.icons.FlatWindowCloseIcon
 TitlePane.iconifyIcon = com.formdev.flatlaf.icons.FlatWindowIconifyIcon
 TitlePane.maximizeIcon = com.formdev.flatlaf.icons.FlatWindowMaximizeIcon
@@ -826,6 +846,16 @@ TitlePane.closePressedBackground = fade($TitlePane.closeHoverBackground,90%)
 TitlePane.closeHoverForeground = #fff
 TitlePane.closePressedForeground = #fff
 
+# window style "small"
+TitlePane.small.font = -1
+TitlePane.small.showIcon = false
+TitlePane.small.buttonSize = 30,20
+TitlePane.small.buttonSymbolHeight = 8
+TitlePane.small.closeIcon = com.formdev.flatlaf.icons.FlatWindowCloseIcon, small
+TitlePane.small.iconifyIcon = com.formdev.flatlaf.icons.FlatWindowIconifyIcon, small
+TitlePane.small.maximizeIcon = com.formdev.flatlaf.icons.FlatWindowMaximizeIcon, small
+TitlePane.small.restoreIcon = com.formdev.flatlaf.icons.FlatWindowRestoreIcon, small
+
 
 #---- ToggleButton ----
 
@@ -880,6 +910,12 @@ ToolBar.spacingBorder = $Button.toolbar.spacingInsets
 ToolTipManager.enableToolTipMode = activeApplication
 
 
+#---- ToolTip ----
+
+ToolTip.borderCornerRadius = $Popup.borderCornerRadius
+[mac]ToolTip.roundedBorderWidth = $Popup.roundedBorderWidth
+
+
 #---- Tree ----
 
 Tree.border = 1,1,1,1

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties

@@ -57,7 +57,7 @@
 @menuAcceleratorSelectionForeground = @selectionForeground
 
 # misc
-@cellFocusColor = #000
+@cellFocusColor = darken(@selectionBackground,20%)
 @icon = shade(@background,27%)
 
 # accent colors (blueish)
@@ -338,6 +338,8 @@ Table.gridColor = darken($Table.background,8%)
 
 #---- TableHeader ----
 
+TableHeader.hoverBackground = darken($TableHeader.background,5%,derived)
+TableHeader.pressedBackground = darken($TableHeader.background,10%,derived)
 TableHeader.separatorColor = darken($TableHeader.background,10%)
 TableHeader.bottomSeparatorColor = $TableHeader.separatorColor
 

flatlaf-core/src/main/resources/com/formdev/flatlaf/IntelliJTheme$ThemeLaf.properties

@@ -49,6 +49,9 @@ infoText = lazy(ToolTip.foreground)
 # make sure that accent color (set via FlatLaf.setSystemColorGetter()) is ignored 
 @accentColor = null
 
+# use fixed color because it is used in borders
+@cellFocusColor = #222
+
 
 #---- Button ----
 
@@ -109,6 +112,9 @@ ToggleButton.endBackground = $ToggleButton.background
 @ijMenuCheckBackgroundL20 = lighten(@selectionBackground,20%,derived noAutoInverse)
 @ijMenuCheckBackgroundD10 = darken(@selectionBackground,10%,derived noAutoInverse)
 
+@ijTextBackgroundL3 = lighten(Panel.background,3%,lazy)
+@ijTextBackgroundL4 = lighten(Panel.background,4%,lazy)
+
 [Arc_Theme]CheckBoxMenuItem.foreground = lazy(MenuItem.foreground)
 [Arc_Theme]PopupMenu.foreground = lazy(MenuItem.foreground)
 [Arc_Theme]RadioButtonMenuItem.foreground = lazy(MenuItem.foreground)
@@ -132,53 +138,110 @@ ToggleButton.endBackground = $ToggleButton.background
 [Arc_Theme_Dark]RadioButtonMenuItem.foreground = lazy(MenuItem.foreground)
 [Arc_Theme_Dark]ProgressBar.selectionBackground = #ddd
 [Arc_Theme_Dark]ProgressBar.selectionForeground = #ddd
+[Arc_Theme_Dark]ToolBar.separatorColor = lazy(Separator.foreground)
 
 [Arc_Theme_Dark_-_Orange]CheckBoxMenuItem.foreground = lazy(MenuItem.foreground)
 [Arc_Theme_Dark_-_Orange]PopupMenu.foreground = lazy(MenuItem.foreground)
 [Arc_Theme_Dark_-_Orange]RadioButtonMenuItem.foreground = lazy(MenuItem.foreground)
 [Arc_Theme_Dark_-_Orange]ProgressBar.selectionBackground = #ddd
 [Arc_Theme_Dark_-_Orange]ProgressBar.selectionForeground = #fff
+[Arc_Theme_Dark_-_Orange]ToolBar.separatorColor = lazy(Separator.foreground)
+
+[Carbon]Table.selectionBackground = lazy(List.selectionBackground)
+[Carbon]Table.selectionInactiveForeground = lazy(List.selectionInactiveForeground)
+[Carbon]TextField.background = @ijTextBackgroundL4
 
 [Cobalt_2]Component.accentColor = lazy(Component.focusColor)
 [Cobalt_2]CheckBox.icon.background = #002946
 [Cobalt_2]CheckBox.icon.checkmarkColor = #002946
 [Cobalt_2]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [Cobalt_2]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
+[Cobalt_2]ComboBox.background = @ijTextBackgroundL3
+[Cobalt_2]ComboBox.buttonBackground = @ijTextBackgroundL3
+[Cobalt_2]TextField.background = @ijTextBackgroundL3
+[Cobalt_2]Table.background = lazy(List.background)
+[Cobalt_2]Tree.background = lazy(List.background)
 
 [Cyan_light]MenuItem.checkBackground = @ijMenuCheckBackgroundL20
 [Cyan_light]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL20
 
+[Dark_Flat_Theme]*.inactiveForeground = #808080
 [Dark_Flat_Theme]Component.accentColor = lazy(List.selectionBackground)
 [Dark_Flat_Theme]TableHeader.background = #3B3B3B
+[Dark_Flat_Theme]TextPane.foreground = lazy(TextField.foreground)
+[Dark_Flat_Theme]CheckBoxMenuItem.selectionForeground = lazy(MenuItem.selectionForeground)
+[Dark_Flat_Theme]List.selectionForeground = lazy(Tree.selectionForeground)
+[Dark_Flat_Theme]RadioButtonMenuItem.selectionForeground = lazy(MenuItem.selectionForeground)
+[Dark_Flat_Theme]Separator.foreground = lazy(ToolBar.separatorColor)
 
 [Dark_purple]Slider.focusedColor = fade($Component.focusColor,70%,derived)
 
 [Dracula---Zihan_Ma]Component.accentColor = lazy(Component.focusColor)
+[Dracula---Zihan_Ma]ComboBox.selectionBackground = lazy(List.selectionBackground)
 [Dracula---Zihan_Ma]ProgressBar.selectionBackground = #fff
 [Dracula---Zihan_Ma]ProgressBar.selectionForeground = #fff
 
+[Gradianto_Dark_Fuchsia]*.selectionBackground = #8452a7
+[Gradianto_Dark_Fuchsia]*.selectionInactiveBackground = #562C6A
 [Gradianto_Dark_Fuchsia]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [Gradianto_Dark_Fuchsia]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
+[Gradianto_Dark_Fuchsia]TextField.background = @ijTextBackgroundL4
+[Gradianto_Dark_Fuchsia]Tree.background = lazy(List.background)
+[Gradianto_Dark_Fuchsia]Separator.foreground = lazy(ScrollBar.track)
+[Gradianto_Dark_Fuchsia]ToolBar.separatorColor = lazy(ScrollBar.track)
+[Gradianto_Dark_Fuchsia]ProgressBar.background = lazy(ScrollBar.track)
+[Gradianto_Dark_Fuchsia]Slider.trackColor = lazy(ScrollBar.track)
+
+[Gradianto_Deep_Ocean]TextField.background = @ijTextBackgroundL3
+[Gradianto_Deep_Ocean]Tree.background = lazy(List.background)
+
+[Gradianto_Midnight_Blue]ScrollBar.thumb = #533B6B
+[Gradianto_Midnight_Blue]Table.selectionForeground = lazy(List.selectionForeground)
+[Gradianto_Midnight_Blue]TextField.background = @ijTextBackgroundL4
+[Gradianto_Midnight_Blue]Tree.background = lazy(List.background)
+
+[Gradianto_Nature_Green]Table.selectionForeground = lazy(List.selectionForeground)
+[Gradianto_Nature_Green]TextField.background = @ijTextBackgroundL4
+
+[Gray]Separator.foreground = lazy(Slider.trackColor)
+[Gray]ToolBar.separatorColor = lazy(Slider.trackColor)
 
 [Gruvbox_Dark_Hard]Component.accentColor = lazy(TabbedPane.underlineColor)
 [Gruvbox_Dark_Hard]ToggleButton.selectedBackground = $ToggleButton.selectedBackground
 [Gruvbox_Dark_Hard]ToggleButton.toolbar.selectedBackground = $ToggleButton.toolbar.selectedBackground
+[Gruvbox_Dark_Hard]ComboBox.background = @ijTextBackgroundL3
+[Gruvbox_Dark_Hard]ComboBox.buttonBackground = @ijTextBackgroundL3
+[Gruvbox_Dark_Hard]TextField.background = @ijTextBackgroundL3
 
 [Gruvbox_Dark_Medium]Component.accentColor = lazy(TabbedPane.underlineColor)
 [Gruvbox_Dark_Medium]ToggleButton.selectedBackground = $ToggleButton.selectedBackground
 [Gruvbox_Dark_Medium]ToggleButton.toolbar.selectedBackground = $ToggleButton.toolbar.selectedBackground
+[Gruvbox_Dark_Medium]ComboBox.background = @ijTextBackgroundL3
+[Gruvbox_Dark_Medium]ComboBox.buttonBackground = @ijTextBackgroundL3
+[Gruvbox_Dark_Medium]TextField.background = @ijTextBackgroundL3
 
 [Gruvbox_Dark_Soft]Component.accentColor = lazy(TabbedPane.underlineColor)
 [Gruvbox_Dark_Soft]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [Gruvbox_Dark_Soft]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
 [Gruvbox_Dark_Soft]ToggleButton.selectedBackground = $ToggleButton.selectedBackground
 [Gruvbox_Dark_Soft]ToggleButton.toolbar.selectedBackground = $ToggleButton.toolbar.selectedBackground
+[Gruvbox_Dark_Soft]ComboBox.background = @ijTextBackgroundL3
+[Gruvbox_Dark_Soft]ComboBox.buttonBackground = @ijTextBackgroundL3
+[Gruvbox_Dark_Soft]TextField.background = @ijTextBackgroundL3
 
+[Hiberbee_Dark]*.disabledForeground = #7F7E7D
+[Hiberbee_Dark]*.disabledText = #7F7E7D
+[Hiberbee_Dark]*.inactiveForeground = #7F7E7D
+[Hiberbee_Dark]ProgressBar.background = lazy(Separator.foreground)
+[Hiberbee_Dark]Slider.trackColor = lazy(Separator.foreground)
 [Hiberbee_Dark]TabbedPane.focusColor = #5A5A5A
 [Hiberbee_Dark]TabbedPane.selectedBackground = #434241
 [Hiberbee_Dark]TabbedPane.selectedForeground = #70D7FF
 [Hiberbee_Dark]ToggleButton.selectedBackground = $ToggleButton.selectedBackground
 [Hiberbee_Dark]ToggleButton.toolbar.selectedBackground = $ToggleButton.toolbar.selectedBackground
+[Hiberbee_Dark]Table.selectionInactiveBackground = lazy(List.selectionInactiveBackground)
+[Hiberbee_Dark]Tree.selectionBackground = lazy(List.selectionBackground)
+[Hiberbee_Dark]Tree.selectionInactiveBackground = lazy(List.selectionInactiveBackground)
 
 [High_contrast]Component.accentColor = lazy(Component.focusColor)
 [High_contrast]ToggleButton.selectedBackground = #fff
@@ -191,9 +254,20 @@ ToggleButton.endBackground = $ToggleButton.background
 	toolbar.selectedBackground: #fff
 [High_contrast][style]ToggleButton.inTextField = $[High_contrast][style]Button.inTextField
 
+[Light_Flat]*.disabledForeground = #8C8C8C
+[Light_Flat]*.inactiveForeground = #8C8C8C
+[Light_Flat]CheckBox.icon[filled].background = #fff
+[Light_Flat]CheckBox.icon[filled].checkmarkColor = #fff
 [Light_Flat]Component.accentColor = lazy(TabbedPane.underlineColor)
+[Light_Flat]ComboBox.background = lazy(ComboBox.editableBackground)
+[Light_Flat]ComboBox.buttonBackground = lazy(ComboBox.editableBackground)
+[Light_Flat]Separator.foreground = lazy(ToolBar.separatorColor)
 [Light_Flat]TableHeader.background = #E5E5E9
+[Light_Flat]TextPane.foreground = lazy(TextField.foreground)
+[Light_Flat]CheckBoxMenuItem.selectionForeground = lazy(MenuItem.selectionForeground)
+[Light_Flat]RadioButtonMenuItem.selectionForeground = lazy(MenuItem.selectionForeground)
 
+[Monocai]Button.default.foreground = #2D2A2F
 [Monocai]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [Monocai]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
 @Monocai.acceleratorForeground = lazy(MenuItem.disabledForeground)
@@ -206,22 +280,67 @@ ToggleButton.endBackground = $ToggleButton.background
 [Monocai]MenuItem.acceleratorSelectionForeground = @Monocai.acceleratorSelectionForeground
 [Monocai]RadioButtonMenuItem.acceleratorForeground = @Monocai.acceleratorForeground
 [Monocai]RadioButtonMenuItem.acceleratorSelectionForeground = @Monocai.acceleratorSelectionForeground
+[Monocai]TextField.background = @ijTextBackgroundL4
+@Monocai.selectionBackground = lazy(TextField.selectionBackground)
+[Monocai]ComboBox.selectionBackground = @Monocai.selectionBackground
+[Monocai]List.selectionBackground = @Monocai.selectionBackground
+[Monocai]Table.selectionBackground = @Monocai.selectionBackground
+[Monocai]Tree.selectionBackground = @Monocai.selectionBackground
+@Monocai.selectionInactiveBackground = lazy(MenuItem.selectionBackground)
+[Monocai]List.selectionInactiveBackground = @Monocai.selectionInactiveBackground
+[Monocai]Table.selectionInactiveBackground = @Monocai.selectionInactiveBackground
+[Monocai]Tree.selectionInactiveBackground = @Monocai.selectionInactiveBackground
 
-[Monokai_Pro]TitledBorder.titleColor = @foreground
+[Monokai_Pro---Subtheme]Table.selectionInactiveForeground = lazy(List.selectionInactiveForeground)
+[Monokai_Pro---Subtheme]Tree.selectionBackground = lazy(List.selectionBackground)
+[Monokai_Pro---Subtheme]Separator.foreground = lazy(Slider.trackColor)
+[Monokai_Pro---Subtheme]ToolBar.separatorColor = lazy(Slider.trackColor)
 
+[Nord]*.inactiveForeground = #616E88
 [Nord]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [Nord]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
+[Nord]List.selectionBackground = lazy(Tree.selectionBackground)
+[Nord]List.selectionForeground = lazy(Tree.selectionForeground)
+[Nord]Table.selectionBackground = lazy(Tree.selectionBackground)
+[Nord]Table.selectionForeground = lazy(Tree.selectionForeground)
+[Nord]TextField.selectionBackground = lazy(Tree.selectionBackground)
+[Nord]TextField.selectionForeground = lazy(Tree.selectionForeground)
+[Nord]Tree.selectionInactiveForeground = lazy(List.selectionInactiveForeground)
 
+[NotReallyMDTheme]*.selectionInactiveBackground = #21384E
+[NotReallyMDTheme]ToolBar.separatorColor = lazy(Separator.foreground)
+
+[One_Dark]List.selectionInactiveForeground = lazy(Tree.selectionInactiveForeground)
 [One_Dark]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [One_Dark]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
+[One_Dark]ProgressBar.background = lazy(Separator.foreground)
+[One_Dark]Slider.trackColor = lazy(Separator.foreground)
 [One_Dark]Slider.focusedColor = fade(#568af2,40%)
+[One_Dark]Table.background = lazy(Tree.background)
+[One_Dark]Table.selectionBackground = lazy(Tree.selectionBackground)
+[One_Dark]TextField.selectionBackground = lazy(List.selectionBackground)
+[One_Dark]Tree.selectionForeground = lazy(List.selectionForeground)
 
+[Solarized_Dark---4lex4]*.inactiveForeground = #657B83
 [Solarized_Dark---4lex4]Component.accentColor = lazy(TabbedPane.underlineColor)
+[Solarized_Dark---4lex4]ComboBox.background = lazy(ComboBox.editableBackground)
+[Solarized_Dark---4lex4]ComboBox.buttonBackground = lazy(ComboBox.editableBackground)
 [Solarized_Dark---4lex4]Slider.focusedColor = fade($Component.focusColor,80%,derived)
+[Solarized_Dark---4lex4]ToolBar.separatorColor = lazy(Separator.foreground)
 
+[Solarized_Light---4lex4]*.inactiveForeground = #839496
 [Solarized_Light---4lex4]Button.default.hoverBackground = darken($Button.default.background,3%,derived)
 [Solarized_Light---4lex4]Component.accentColor = lazy(TabbedPane.underlineColor)
 
+[Spacegray]ComboBox.background = @ijTextBackgroundL4
+[Spacegray]ComboBox.buttonBackground = @ijTextBackgroundL4
+[Spacegray]TextField.background = @ijTextBackgroundL4
+[Spacegray]TextField.selectionBackground = lazy(Tree.selectionBackground)
+[Spacegray]TextField.selectionForeground = lazy(Tree.selectionForeground)
+
+[vuesion-theme]*.disabledForeground = #8C8C8C
+[vuesion-theme]*.disabledText = #8C8C8C
+[vuesion-theme]*.inactiveForeground = #8C8C8C
 [vuesion-theme]Component.accentColor = lazy(Button.default.endBackground)
 [vuesion-theme]MenuItem.checkBackground = @ijMenuCheckBackgroundL10
 [vuesion-theme]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL10
@@ -229,6 +348,12 @@ ToggleButton.endBackground = $ToggleButton.background
 [vuesion-theme]Slider.trackColor = #303a45
 [vuesion-theme]Slider.thumbColor = #ececee
 [vuesion-theme]Slider.focusedColor = fade(#ececee,20%)
+[vuesion-theme]ComboBox.background = @ijTextBackgroundL4
+[vuesion-theme]ComboBox.buttonBackground = @ijTextBackgroundL4
+[vuesion-theme]TextField.background = @ijTextBackgroundL4
+[vuesion-theme]TextField.selectionBackground = lighten(#303A45,15%)
+
+[Xcode-Dark]TextField.background = @ijTextBackgroundL4
 
 
 # Material Theme UI Lite
@@ -238,62 +363,106 @@ ToggleButton.endBackground = $ToggleButton.background
 [dark][author-Mallowigi]MenuItem.checkBackground = @ijMenuCheckBackgroundL20
 [dark][author-Mallowigi]MenuItem.underlineSelectionCheckBackground = @ijMenuCheckBackgroundL20
 
+[author-Mallowigi]Tree.selectionInactiveBackground = lazy(List.selectionInactiveBackground)
+
+[Arc_Dark]ComboBox.selectionBackground = lazy(List.selectionBackground)
+[Arc_Dark]Table.selectionBackground = lazy(List.selectionBackground)
+
+[Atom_One_Dark]Separator.foreground = lazy(Slider.trackColor)
+[Atom_One_Dark]ToolBar.separatorColor = lazy(Slider.trackColor)
+
+[Atom_One_Light]List.selectionBackground = lazy(Table.selectionBackground)
+[Atom_One_Light]Tree.selectionBackground = lazy(Table.selectionBackground)
+[Atom_One_Light]TabbedPane.contentAreaColor = lazy(Separator.foreground)
+
+[Dracula---Mallowigi]*.selectionBackground = #44475A
+[Dracula---Mallowigi]List.selectionInactiveForeground = lazy(Tree.selectionInactiveForeground)
 [Dracula---Mallowigi]ProgressBar.selectionBackground = #fff
 [Dracula---Mallowigi]ProgressBar.selectionForeground = #fff
-
-[Dracula_Contrast]ProgressBar.selectionBackground = #fff
-[Dracula_Contrast]ProgressBar.selectionForeground = #fff
+[Dracula---Mallowigi]RadioButtonMenuItem.selectionForeground = lazy(CheckBoxMenuItem.selectionForeground)
+[Dracula---Mallowigi]Table.selectionForeground = lazy(List.selectionForeground)
+[Dracula---Mallowigi]Separator.foreground = lazy(Slider.trackColor)
+[Dracula---Mallowigi]ToolBar.separatorColor = lazy(Slider.trackColor)
 
 [GitHub]ProgressBar.selectionBackground = #222
 [GitHub]ProgressBar.selectionForeground = #222
+[GitHub]TextField.background = @ijTextBackgroundL3
+[GitHub]List.selectionBackground = lazy(Table.selectionBackground)
+[GitHub]Tree.selectionBackground = lazy(Table.selectionBackground)
 
-[GitHub_Contrast]ProgressBar.selectionBackground = #222
-[GitHub_Contrast]ProgressBar.selectionForeground = #222
+[GitHub_Dark]ComboBox.selectionBackground = lazy(Tree.selectionBackground)
+[GitHub_Dark]Table.selectionBackground = lazy(Tree.selectionBackground)
+[GitHub_Dark]Separator.foreground = lazy(Slider.trackColor)
+[GitHub_Dark]ToolBar.separatorColor = lazy(Slider.trackColor)
 
+[Light_Owl]CheckBoxMenuItem.selectionForeground = lazy(CheckBoxMenuItem.foreground)
+[Light_Owl]ComboBox.selectionForeground = lazy(ComboBox.foreground)
 [Light_Owl]List.selectionInactiveForeground = lazy(List.foreground)
+[Light_Owl]Menu.selectionForeground = lazy(Menu.foreground)
+[Light_Owl]MenuBar.selectionForeground = lazy(MenuBar.foreground)
+[Light_Owl]MenuItem.selectionForeground = lazy(MenuItem.foreground)
 [Light_Owl]ProgressBar.selectionBackground = #111
 [Light_Owl]ProgressBar.selectionForeground = #fff
-[Light_Owl]TabbedPane.selectedForeground = lazy(TabbedPane.foreground)
+[Light_Owl]Spinner.selectionForeground = lazy(Spinner.foreground)
 [Light_Owl]Table.selectionForeground = lazy(Table.foreground)
+[Light_Owl]TextField.selectionForeground = lazy(TextField.foreground)
+[Light_Owl]TextField.background = @ijTextBackgroundL3
+[Light_Owl]List.selectionBackground = lazy(Table.selectionBackground)
+[Light_Owl]Tree.selectionBackground = lazy(Table.selectionBackground)
 
-[Light_Owl_Contrast]List.selectionInactiveForeground = lazy(List.foreground)
-[Light_Owl_Contrast]ProgressBar.selectionBackground = #111
-[Light_Owl_Contrast]ProgressBar.selectionForeground = #fff
-[Light_Owl_Contrast]TabbedPane.selectedForeground = lazy(TabbedPane.foreground)
-[Light_Owl_Contrast]Table.selectionForeground = lazy(Table.foreground)
+[Material_Darker]*.selectionBackground = lighten(#2D2D2D,15%)
+[Material_Darker]Separator.foreground = lazy(Slider.trackColor)
+[Material_Darker]ToolBar.separatorColor = lazy(Slider.trackColor)
 
+[Material_Deep_Ocean]*.selectionBackground = lighten(#222533,15%)
+[Material_Deep_Ocean]Separator.foreground = lazy(Slider.trackColor)
+[Material_Deep_Ocean]ToolBar.separatorColor = lazy(Slider.trackColor)
+
+[Material_Lighter]List.selectionInactiveForeground = lazy(Tree.selectionInactiveForeground)
 [Material_Lighter]ProgressBar.selectionBackground = #222
 [Material_Lighter]ProgressBar.selectionForeground = #fff
-
-[Material_Lighter_Contrast]ProgressBar.selectionBackground = #222
-[Material_Lighter_Contrast]ProgressBar.selectionForeground = #fff
+[Material_Lighter]ComboBox.selectionBackground = lazy(List.selectionBackground)
+[Material_Lighter]Table.selectionBackground = lazy(List.selectionBackground)
+[Material_Lighter]List.selectionForeground = lazy(Table.selectionForeground)
+[Material_Lighter]RadioButtonMenuItem.selectionForeground = lazy(Table.selectionForeground)
+[Material_Lighter]Tree.selectionForeground = lazy(Table.selectionForeground)
 
 [Material_Oceanic]ProgressBar.selectionBackground = #ddd
 [Material_Oceanic]ProgressBar.selectionForeground = #ddd
-
-[Material_Oceanic_Contrast]ProgressBar.selectionBackground = #ddd
-[Material_Oceanic_Contrast]ProgressBar.selectionForeground = #ddd
+[Material_Oceanic]Separator.foreground = lazy(Slider.trackColor)
+[Material_Oceanic]ToolBar.separatorColor = lazy(Slider.trackColor)
 
 [Material_Palenight]ProgressBar.selectionBackground = #ddd
 [Material_Palenight]ProgressBar.selectionForeground = #ddd
+[Material_Palenight]List.selectionBackground = lazy(Table.selectionBackground)
+[Material_Palenight]Tree.selectionBackground = lazy(Table.selectionBackground)
+[Material_Palenight]Separator.foreground = lazy(Slider.trackColor)
+[Material_Palenight]ToolBar.separatorColor = lazy(Slider.trackColor)
 
-[Material_Palenight_Contrast]ProgressBar.selectionBackground = #ddd
-[Material_Palenight_Contrast]ProgressBar.selectionForeground = #ddd
+[Monokai_Pro---Mallowigi]List.selectionForeground = lazy(Table.selectionForeground)
+[Monokai_Pro---Mallowigi]RadioButtonMenuItem.selectionForeground = lazy(Table.selectionForeground)
+[Monokai_Pro---Mallowigi]Table.selectionInactiveForeground = lazy(List.selectionInactiveForeground)
+[Monokai_Pro---Mallowigi]Tree.selectionForeground = lazy(Table.selectionForeground)
+[Monokai_Pro---Mallowigi]Tree.selectionInactiveForeground = lazy(List.selectionInactiveForeground)
+[Monokai_Pro---Mallowigi]Separator.foreground = lazy(Slider.trackColor)
+[Monokai_Pro---Mallowigi]ToolBar.separatorColor = lazy(Slider.trackColor)
+
+[Moonlight]ComboBox.selectionBackground = lazy(List.selectionBackground)
+[Moonlight]Table.selectionBackground = lazy(List.selectionBackground)
+[Moonlight]Separator.foreground = lazy(Slider.trackColor)
+[Moonlight]ToolBar.separatorColor = lazy(Slider.trackColor)
 
 [Night_Owl]ProgressBar.selectionBackground = #ddd
 [Night_Owl]ProgressBar.selectionForeground = #ddd
 
-[Night_Owl_Contrast]ProgressBar.selectionBackground = #ddd
-[Night_Owl_Contrast]ProgressBar.selectionForeground = #ddd
-
 [Solarized_Dark---Mallowigi]ProgressBar.selectionBackground = #ccc
 [Solarized_Dark---Mallowigi]ProgressBar.selectionForeground = #ccc
-
-[Solarized_Dark_Contrast]ProgressBar.selectionBackground = #ccc
-[Solarized_Dark_Contrast]ProgressBar.selectionForeground = #ccc
+[Solarized_Dark---Mallowigi]Separator.foreground = lazy(Slider.trackColor)
+[Solarized_Dark---Mallowigi]ToolBar.separatorColor = lazy(Slider.trackColor)
 
 [Solarized_Light---Mallowigi]ProgressBar.selectionBackground = #222
 [Solarized_Light---Mallowigi]ProgressBar.selectionForeground = #fff
-
-[Solarized_Light_Contrast]ProgressBar.selectionBackground = #222
-[Solarized_Light_Contrast]ProgressBar.selectionForeground = #fff
+[Solarized_Light---Mallowigi]ComboBox.selectionBackground = lazy(List.selectionBackground)
+[Solarized_Light---Mallowigi]Table.selectionBackground = lazy(List.selectionBackground)
+[Solarized_Light---Mallowigi]Separator.foreground = lazy(Slider.trackColor)
+[Solarized_Light---Mallowigi]ToolBar.separatorColor = lazy(Slider.trackColor)