macOS: improved macOS support of Demo and Theme Editor:

- set application name that is used in screen menu bar
- enable dark window title bars if macOS is in dark mode

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

@@ -34,10 +34,24 @@ public class FlatLafDemo
 	static boolean screenshotsMode = Boolean.parseBoolean( System.getProperty( "flatlaf.demo.screenshotsMode" ) );
 
 	public static void main( String[] args ) {
-		// on macOS enable screen menu bar
+		// macOS
-		if( SystemInfo.isMacOS && System.getProperty( "apple.laf.useScreenMenuBar" ) == null )
+		if( SystemInfo.isMacOS ) {
+			// enable screen menu bar
+			// (moves menu bar from JFrame window to top of screen)
 			System.setProperty( "apple.laf.useScreenMenuBar", "true" );
 
+			// application name used in screen menu bar
+			// (in first menu after the "apple" menu)
+			System.setProperty( "apple.awt.application.name", "FlatLaf Demo" );
+
+			// appearance of window title bars
+			// possible values:
+			//   - "system": use current macOS appearance (light or dark)
+			//   - "NSAppearanceNameAqua": use light appearance
+			//   - "NSAppearanceNameDarkAqua": use dark appearance
+			System.setProperty( "apple.awt.application.appearance", "system" );
+		}
+
 		if( FlatLafDemo.screenshotsMode && !SystemInfo.isJava_9_orLater && System.getProperty( "flatlaf.uiScale" ) == null )
 			System.setProperty( "flatlaf.uiScale", "2x" );
 

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatLafThemeEditor.java

@@ -16,6 +16,8 @@
 
 package com.formdev.flatlaf.themeeditor;
 
+import com.formdev.flatlaf.util.SystemInfo;
+
 /**
  * FlatLaf Theme Editor
  *
@@ -24,6 +26,24 @@ package com.formdev.flatlaf.themeeditor;
 public class FlatLafThemeEditor
 {
 	public static void main( String[] args ) {
+		// macOS
+		if( SystemInfo.isMacOS ) {
+			// enable screen menu bar
+			// (moves menu bar from JFrame window to top of screen)
+			System.setProperty( "apple.laf.useScreenMenuBar", "true" );
+
+			// application name used in screen menu bar
+			// (in first menu after the "apple" menu)
+			System.setProperty( "apple.awt.application.name", "FlatLaf Theme Editor" );
+
+			// appearance of window title bars
+			// possible values:
+			//   - "system": use current macOS appearance (light or dark)
+			//   - "NSAppearanceNameAqua": use light appearance
+			//   - "NSAppearanceNameDarkAqua": use dark appearance
+			System.setProperty( "apple.awt.application.appearance", "system" );
+		}
+
 		FlatThemeFileEditor.main( args );
 	}
 }

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemeFileEditor.java

@@ -104,10 +104,6 @@ class FlatThemeFileEditor
 		Locale.setDefault( Locale.ENGLISH );
 		System.setProperty( "user.language", "en" );
 
-		// on macOS enable screen menu bar
-		if( SystemInfo.isMacOS )
-			System.setProperty( "apple.laf.useScreenMenuBar", "true" );
-
 		SwingUtilities.invokeLater( () -> {
 			FlatLaf.registerCustomDefaultsSource( "com.formdev.flatlaf.themeeditor" );