Support running in JetBrains Projector (https://jetbrains.com/projector/)

CHANGELOG.md

@@ -20,6 +20,7 @@ FlatLaf Change Log
     "TitlePane.unifiedBackground", true );` then window title bar and menu bar
     use same background color as main content. (PR #268; issue #254)
 - JIDE Common Layer: Support `JideButton`, `JideLabel` and `JideToggleButton`.
+- Support running in [JetBrains Projector](https://jetbrains.com/projector/).
 
 #### Fixed bugs
 

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

@@ -157,6 +157,9 @@ public abstract class FlatLaf
 	 */
 	@Override
 	public boolean getSupportsWindowDecorations() {
+		if( SystemInfo.isProjector )
+			return false;
+
 		if( SystemInfo.isWindows_10_orLater &&
 			FlatNativeWindowBorder.isSupported() )
 		  return false;

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

@@ -225,6 +225,10 @@ public class FlatNativeWindowBorder
 		if( !SystemInfo.isWindows_10_orLater )
 			return;
 
+		// do not use when running in JetBrains Projector
+		if( SystemInfo.isProjector )
+			return;
+
 		// check whether disabled via system property
 		if( !FlatSystemProperties.getBoolean( FlatSystemProperties.USE_WINDOW_DECORATIONS, true ) )
 			return;

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

@@ -70,7 +70,7 @@ public class FlatPopupFactory
 
 		boolean forceHeavyWeight = isOptionEnabled( owner, contents, FlatClientProperties.POPUP_FORCE_HEAVY_WEIGHT, "Popup.forceHeavyWeight" );
 
-		if( !isOptionEnabled( owner, contents, FlatClientProperties.POPUP_DROP_SHADOW_PAINTED, "Popup.dropShadowPainted" ) )
+		if( !isOptionEnabled( owner, contents, FlatClientProperties.POPUP_DROP_SHADOW_PAINTED, "Popup.dropShadowPainted" ) || SystemInfo.isProjector )
 			return new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight ), contents );
 
 		// macOS and Linux adds drop shadow to heavy weight popups

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

@@ -54,6 +54,9 @@ public class SystemInfo
 	// UI toolkits
 	public static final boolean isKDE;
 
+	// other
+	public static final boolean isProjector;
+
 	static {
 		// platforms
 		String osName = System.getProperty( "os.name" ).toLowerCase( Locale.ENGLISH );
@@ -85,6 +88,9 @@ public class SystemInfo
 
 		// UI toolkits
 		isKDE = (isLinux && System.getenv( "KDE_FULL_SESSION" ) != null);
+
+		// other
+		isProjector = Boolean.getBoolean( "org.jetbrains.projector.server.enable" );
 	}
 
 	public static long scanVersion( String version ) {