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

@@ -103,6 +103,12 @@
 
     @Override
     public void removeDropTarget(DropTarget dt) {
         getLwTarget().removeDropTarget(dt);
     }
+
+    @Override
+    public void setBounds(int x, int y, int width, int height, int op) {
+        super.setBounds(x, y, width, height, op);
+        paintPending = false;
+    }
 }