A DESCRIPTION OF THE REGRESSION :
In the latest Mustang builds, on Windows XP Home with Service Pack 2, disabled javax.swing.JButton components have an unsightly one-pixel-thick black border around them.

REPRODUCIBLE TESTCASE OR STEPS TO REPRODUCE:

import java.awt.*;
import javax.swing.*;


public class DisabledButtonTest {

    public static void main(String[] args) throws Exception {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

JButton disabledButton = new JButton("Disabled Button");
disabledButton.setEnabled(false);

JPanel panel = new JPanel(new FlowLayout());
panel.add(new JButton("Enabled Button"));
panel.add(disabledButton);

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);

frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
    }

}


RELEASE LAST WORKED:
5.0 Update 6

RELEASE TEST FAILS:
mustang-b70

APPLICATION NAME: Zion Software's JBuddy Messenger APPLICATION VERSION: Any version

APPLICATION NAME: Netbeans APPLICATION VERSION: Any version

OBSERVED APPLICATION IMPACT:
Applications under Windows XP will stand out in a bad way, as disabled buttons stand out more with the incorrect border. It will give users the impression that Java applications are not at home on the desktop.