src/macosx/classes/sun/lwawt/LWToolkit.java

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@@ -520,16 +520,10 @@
 
     public static void postEvent(AWTEvent event) {
         postEvent(targetToAppContext(event.getSource()), event);
     }
 
-    // use peer's back buffer to implement non-opaque windows.
-    @Override
-    public boolean needUpdateWindow() {
-        return true;
-    }
-
     @Override
     public void grab(Window w) {
         if (w.getPeer() != null) {
             ((LWWindowPeer)w.getPeer()).grab();
         }