Window decorations:

- enabled `TitlePane.unifiedBackground` by default (because seems to be standard on Windows 11)
- no longer paint a bottom separator for the menu bar (if unified background is enabled)

CHANGELOG.md

@@ -13,6 +13,9 @@ FlatLaf Change Log
     and use them in any component. (PR #388)\
     E.g.: `mySlider.putClientProperty( "FlatLaf.styleClass", "myclass" );`
 - Native window decorations (Windows 10/11 only):
+  - Unified backgrounds for window title bar is now enabled by default (window
+    title bar has now same background color as window content). Bottom separator
+    for menu bars is no longer painted (if unified background is enabled).
   - Show Windows 11 snap layouts menu when hovering the mouse over the maximize
     button. (issues #397 and #407)
   - Option to hide window icon (for single window set client property

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

@@ -53,6 +53,9 @@ public class FlatMenuBarBorder
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+		if( !showBottomSeparator() )
+			return;
+
 		float lineHeight = scale( (float) 1 );
 		FlatUIUtils.paintFilledRectangle( g, borderColor, x, y + height - lineHeight, width, lineHeight );
 	}
@@ -68,4 +71,9 @@ public class FlatMenuBarBorder
 		insets.right = scale( margin.right );
 		return insets;
 	}
+
+	/** @since 2 */
+	protected boolean showBottomSeparator() {
+		return !UIManager.getBoolean( "TitlePane.unifiedBackground" );
+	}
 }

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

@@ -709,7 +709,7 @@ TitledBorder.border = 1,1,1,1,$Separator.foreground
 
 TitlePane.useWindowDecorations = true
 TitlePane.menuBarEmbedded = true
-TitlePane.unifiedBackground = false
+TitlePane.unifiedBackground = true
 TitlePane.showIcon = true
 TitlePane.noIconLeftGap = 8
 TitlePane.iconSize = 16,16

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.java

@@ -718,13 +718,11 @@ class DemoFrame
 
 				//---- windowDecorationsCheckBoxMenuItem ----
 				windowDecorationsCheckBoxMenuItem.setText("Window decorations");
-				windowDecorationsCheckBoxMenuItem.setSelected(true);
 				windowDecorationsCheckBoxMenuItem.addActionListener(e -> windowDecorationsChanged());
 				optionsMenu.add(windowDecorationsCheckBoxMenuItem);
 
 				//---- menuBarEmbeddedCheckBoxMenuItem ----
 				menuBarEmbeddedCheckBoxMenuItem.setText("Embedded menu bar");
-				menuBarEmbeddedCheckBoxMenuItem.setSelected(true);
 				menuBarEmbeddedCheckBoxMenuItem.addActionListener(e -> menuBarEmbeddedChanged());
 				optionsMenu.add(menuBarEmbeddedCheckBoxMenuItem);
 
@@ -876,6 +874,10 @@ class DemoFrame
 		pasteMenuItem.addActionListener( new DefaultEditorKit.PasteAction() );
 
 		if( FlatLaf.supportsNativeWindowDecorations() ) {
+			windowDecorationsCheckBoxMenuItem.setSelected( FlatLaf.isUseNativeWindowDecorations() );
+			menuBarEmbeddedCheckBoxMenuItem.setSelected( UIManager.getBoolean( "TitlePane.menuBarEmbedded" ) );
+			unifiedTitleBarMenuItem.setSelected( UIManager.getBoolean( "TitlePane.unifiedBackground" ) );
+
 			if( JBRCustomDecorations.isSupported() ) {
 				// If the JetBrains Runtime is used, it forces the use of it's own custom
 				// window decoration, which can not disabled.

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.jfd

@@ -354,7 +354,6 @@ new FormModel {
 					add( new FormComponent( "javax.swing.JCheckBoxMenuItem" ) {
 						name: "windowDecorationsCheckBoxMenuItem"
 						"text": "Window decorations"
-						"selected": true
 						auxiliary() {
 							"JavaCodeGenerator.variableLocal": false
 						}
@@ -363,7 +362,6 @@ new FormModel {
 					add( new FormComponent( "javax.swing.JCheckBoxMenuItem" ) {
 						name: "menuBarEmbeddedCheckBoxMenuItem"
 						"text": "Embedded menu bar"
-						"selected": true
 						auxiliary() {
 							"JavaCodeGenerator.variableLocal": false
 						}

flatlaf-testing/dumps/uidefaults/FlatDarkLaf_1.8.0.txt

@@ -1217,7 +1217,7 @@ TitlePane.noIconLeftGap        8
 TitlePane.restoreIcon          [lazy] 44,30    com.formdev.flatlaf.icons.FlatWindowRestoreIcon [UI]
 TitlePane.showIcon             true
 TitlePane.titleMargins         3,0,3,0    javax.swing.plaf.InsetsUIResource [UI]
-TitlePane.unifiedBackground    false
+TitlePane.unifiedBackground    true
 TitlePane.useWindowDecorations true
 
 

flatlaf-testing/dumps/uidefaults/FlatLightLaf_1.8.0.txt

@@ -1222,7 +1222,7 @@ TitlePane.noIconLeftGap        8
 TitlePane.restoreIcon          [lazy] 44,30    com.formdev.flatlaf.icons.FlatWindowRestoreIcon [UI]
 TitlePane.showIcon             true
 TitlePane.titleMargins         3,0,3,0    javax.swing.plaf.InsetsUIResource [UI]
-TitlePane.unifiedBackground    false
+TitlePane.unifiedBackground    true
 TitlePane.useWindowDecorations true
 
 

flatlaf-testing/dumps/uidefaults/FlatTestLaf_1.8.0.txt

@@ -1237,7 +1237,7 @@ TitlePane.noIconLeftGap        8
 TitlePane.restoreIcon          [lazy] 44,30    com.formdev.flatlaf.icons.FlatWindowRestoreIcon [UI]
 TitlePane.showIcon             true
 TitlePane.titleMargins         3,0,3,0    javax.swing.plaf.InsetsUIResource [UI]
-TitlePane.unifiedBackground    false
+TitlePane.unifiedBackground    true
 TitlePane.useWindowDecorations true