diff -r eada40c7d74d -r 4d45f7ebc0d7 jdk/src/macosx/classes/sun/lwawt/LWRepaintArea.java
--- a/jdk/src/macosx/classes/sun/lwawt/LWRepaintArea.java	Thu Jun 28 14:05:06 2012 +0400
+++ b/jdk/src/macosx/classes/sun/lwawt/LWRepaintArea.java	Wed Jul 04 14:38:14 2012 +0400
@@ -58,9 +58,6 @@
 
     private static void flushBuffers(final LWComponentPeer peer) {
         if (peer != null) {
-            if (!peer.getWindowPeerOrSelf().isOpaque()) {
-                peer.flushOffscreenGraphics();
-            }
             peer.flushOnscreenGraphics();
         }
     }