src/java.desktop/unix/classes/sun/awt/X11/XPopupMenuPeer.java

@@ -213,11 +213,11 @@
      * function converted to global coordinates
      * @param windowSize the desired size of menu's window
      */
     protected Rectangle getWindowBounds(Point origin, Dimension windowSize) {
         Rectangle globalBounds = new Rectangle(origin.x, origin.y, 0, 0);
-        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+        Dimension screenSize = graphicsConfig.getBounds().getSize();        
         Rectangle res;
         res = fitWindowRight(globalBounds, windowSize, screenSize);
         if (res != null) {
             return res;
         }