src/java.desktop/windows/classes/sun/awt/windows/WCanvasPeer.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1996, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -67,12 +67,11 @@
     }
 
     @Override
     public void paint(Graphics g) {
         Dimension d = ((Component)target).getSize();
-        if (g instanceof Graphics2D ||
-            g instanceof sun.awt.Graphics2Delegate) {
+        if (g instanceof Graphics2D) {
             // background color is setup correctly, so just use clearRect
             g.clearRect(0, 0, d.width, d.height);
         } else {
             // emulate clearRect
             g.setColor(((Component)target).getBackground());