Window decorations: use special fix for maximized bounds only on Windows (issue #469)

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

@@ -615,7 +615,7 @@ debug*/
 			int maximizedWidth = screenBounds.width;
 			int maximizedHeight = screenBounds.height;
 
-			if( !isMaximizedBoundsFixed() ) {
+			if( SystemInfo.isWindows && !isMaximizedBoundsFixed() ) {
 				// on Java 8 to 14, maximized x,y are 0,0 based on all screens in a multi-screen environment
 				maximizedX = 0;
 				maximizedY = 0;