replaced MetalRootPaneUI on Windows and Linux (issue #47)

(preparation for replacing "base" Metal LaF with BasicLookAndFeel)

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

@@ -72,6 +72,15 @@ class UIDefaultsRemover
 		"RadioButton.select",
 		"RadioButton.totalInsets",
 
+		"RootPane.colorChooserDialogBorder",
+		"RootPane.errorDialogBorder",
+		"RootPane.fileChooserDialogBorder",
+		"RootPane.frameBorder",
+		"RootPane.informationDialogBorder",
+		"RootPane.plainDialogBorder",
+		"RootPane.questionDialogBorder",
+		"RootPane.warningDialogBorder",
+
 		"ScrollBar.darkShadow",
 		"ScrollBar.highlight",
 		"ScrollBar.shadow",

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

@@ -0,0 +1,38 @@
+/*
+ * 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 javax.swing.JComponent;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicRootPaneUI;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JRootPane}.
+ *
+ * @author Karl Tauber
+ */
+public class FlatRootPaneUI
+	extends BasicRootPaneUI
+{
+	private static ComponentUI instance;
+
+	public static ComponentUI createUI( JComponent c ) {
+		if( instance == null )
+			instance = new FlatRootPaneUI();
+		return instance;
+	}
+}

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

@@ -39,6 +39,8 @@ PopupMenuSeparatorUI=com.formdev.flatlaf.ui.FlatPopupMenuSeparatorUI
 ProgressBarUI=com.formdev.flatlaf.ui.FlatProgressBarUI
 RadioButtonUI=com.formdev.flatlaf.ui.FlatRadioButtonUI
 RadioButtonMenuItemUI=com.formdev.flatlaf.ui.FlatRadioButtonMenuItemUI
+[win]RootPaneUI=com.formdev.flatlaf.ui.FlatRootPaneUI
+[linux]RootPaneUI=com.formdev.flatlaf.ui.FlatRootPaneUI
 ScrollBarUI=com.formdev.flatlaf.ui.FlatScrollBarUI
 ScrollPaneUI=com.formdev.flatlaf.ui.FlatScrollPaneUI
 SeparatorUI=com.formdev.flatlaf.ui.FlatSeparatorUI

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/uidefaults/FlatDarkLaf_1.8.0_202.txt

@@ -1031,7 +1031,6 @@ Resizable.resizeBorder         [lazy] 4,4,4,4  false    com.formdev.flatlaf.ui.F
 RootPane.ancestorInputMap      [lazy] 2    javax.swing.plaf.InputMapUIResource [UI]
     pressed CONTEXT_MENU            postPopup
     shift pressed F10               postPopup
-RootPane.colorChooserDialogBorder [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$QuestionDialogBorder [UI]
 RootPane.defaultButtonWindowKeyBindings length=8    [Ljava.lang.Object;
     [0] ENTER
     [1] press
@@ -1041,14 +1040,7 @@ RootPane.defaultButtonWindowKeyBindings length=8    [Ljava.lang.Object;
     [5] press
     [6] ctrl released ENTER
     [7] release
-RootPane.errorDialogBorder     [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$ErrorDialogBorder [UI]
+RootPaneUI                     com.formdev.flatlaf.ui.FlatRootPaneUI
-RootPane.fileChooserDialogBorder [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$QuestionDialogBorder [UI]
-RootPane.frameBorder           [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$FrameBorder [UI]
-RootPane.informationDialogBorder [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$DialogBorder [UI]
-RootPane.plainDialogBorder     [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$DialogBorder [UI]
-RootPane.questionDialogBorder  [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$QuestionDialogBorder [UI]
-RootPane.warningDialogBorder   [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$WarningDialogBorder [UI]
-RootPaneUI                     javax.swing.plaf.metal.MetalRootPaneUI
 
 
 #---- ScrollBar ----

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/uidefaults/FlatLightLaf_1.8.0_202.txt

@@ -1033,7 +1033,6 @@ Resizable.resizeBorder         [lazy] 4,4,4,4  false    com.formdev.flatlaf.ui.F
 RootPane.ancestorInputMap      [lazy] 2    javax.swing.plaf.InputMapUIResource [UI]
     pressed CONTEXT_MENU            postPopup
     shift pressed F10               postPopup
-RootPane.colorChooserDialogBorder [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$QuestionDialogBorder [UI]
 RootPane.defaultButtonWindowKeyBindings length=8    [Ljava.lang.Object;
     [0] ENTER
     [1] press
@@ -1043,14 +1042,7 @@ RootPane.defaultButtonWindowKeyBindings length=8    [Ljava.lang.Object;
     [5] press
     [6] ctrl released ENTER
     [7] release
-RootPane.errorDialogBorder     [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$ErrorDialogBorder [UI]
+RootPaneUI                     com.formdev.flatlaf.ui.FlatRootPaneUI
-RootPane.fileChooserDialogBorder [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$QuestionDialogBorder [UI]
-RootPane.frameBorder           [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$FrameBorder [UI]
-RootPane.informationDialogBorder [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$DialogBorder [UI]
-RootPane.plainDialogBorder     [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$DialogBorder [UI]
-RootPane.questionDialogBorder  [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$QuestionDialogBorder [UI]
-RootPane.warningDialogBorder   [lazy] 5,5,5,5  false    javax.swing.plaf.metal.MetalBorders$WarningDialogBorder [UI]
-RootPaneUI                     javax.swing.plaf.metal.MetalRootPaneUI
 
 
 #---- ScrollBar ----