REGRESSION: Heavy weight Popups are broken with custom PopupFactory in a sandbox environment

FULL PRODUCT VERSION :
java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b55)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b55, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux blade 2.6.13-02 #2 Fri Sep 2 11:43:56 Local time zone must be set--see zic manua i686 Mobile Intel(R) Pentium(R) 4 - M CPU 1.90GHz GenuineIntel GNU/Linux


A DESCRIPTION OF THE PROBLEM :
When I create a subclass of PopupFactory and _override_ #getPopup(Component,
Component, int, int) of PopupFactory and use this subclass in a sandbox
environment, then the heavy weight Popups are not shown properly.
Medium weight and light weight Popups are shown without a problem.
When I do not override the #getPopup-method, everything seems to work fine.
This problem is not reproducible on Windows.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) compile the test case.

2) run the test case with following command:

    java -Djava.security.manager Test

3) when the window is visible, move the mouse cursor
     over the button to display the tooltip.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
A nice tooltip.
ACTUAL -
An empty window with no content. The window height grows when the heavy weight
Popup is displayed again.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Component;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.Popup;
import javax.swing.PopupFactory;

/**
 * @author Andrej Golovnin
 * @version $Revision$
 */
public class Test {

    public static void main(String[] args) {
        PopupFactory.setSharedInstance(new MyPopupFactory());
        JFrame frame = new JFrame("Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton button = new JButton("Test");
        button.setToolTipText("A very very very very very long tooltip.");
        frame.getContentPane().add(button);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

}

class MyPopupFactory extends PopupFactory {

    public Popup getPopup(Component owner, Component contents, int x, int y) throws IllegalArgumentException {
        return super.getPopup(owner, contents, x, y);
    }
    
}

---------- END SOURCE ----------

Release Regression From : mustang
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.