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

*** 1,7 ****
  /*
!  * Copyright (c) 1996, 2014, 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
--- 1,7 ----
  /*
!  * 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
*** 67,78 ****
      }
  
      @Override
      public void paint(Graphics g) {
          Dimension d = ((Component)target).getSize();
!         if (g instanceof Graphics2D ||
!             g instanceof sun.awt.Graphics2Delegate) {
              // 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());
--- 67,77 ----
      }
  
      @Override
      public void paint(Graphics g) {
          Dimension d = ((Component)target).getSize();
!         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());