A DESCRIPTION OF THE REQUEST :
Under version 6, popup menus could be translucent, even against a transparent/translucent window. Under 7u3 the popup becomes opaque when its parent window is non-opaque.

JUSTIFICATION :
Consistency with previous versions (6u31), and it can make for a nice visual effect. My application becomes "broken" because it offers the option for menu translucency.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Popups against a non-opaque window should be allowed to be translucent.
ACTUAL -
Popups against a non-opaque window can't be translucent. Here's a screenshot showing the difference between 6u31 and 7u3:

http://globalisk.com/java/JDK6v7.png


---------- BEGIN SOURCE ----------
import javax.swing.*;
import javax.swing.plaf.basic.*;
import java.awt.*;

public class TranslucentPopup {
    
    public static void main( String[] args ) {
        JMenu fileMenu = new JMenu( "File" );
        fileMenu.getPopupMenu().setUI( new TranslucentPopupMenuUI() );
        fileMenu.add( new JTranslucentMenuItem( "One" ) );
        fileMenu.add( new JTranslucentMenuItem( "Two" ) );
        fileMenu.add( new JTranslucentMenuItem( "Three" ) );
        JFrame frame = new JFrame( "Test transclucent menus" );
        frame.setUndecorated( true );
        com.sun.awt.AWTUtilities.setWindowOpaque( frame, false );
        JMenuBar mb = new JMenuBar();
        mb.add( fileMenu );
        frame.setLayout( new BorderLayout() );
        frame.add( mb, BorderLayout.NORTH );
        JPanel pan = new JPanel( new BorderLayout() );
        pan.setBackground( new Color( 224, 174, 174, 174 ) );
        frame.add( pan, BorderLayout.CENTER );
        frame.pack();
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.setSize( 300, 300 );
        frame.setLocation( 400, 250 );
        frame.setVisible( true );
    }
    
    static class JTranslucentMenuItem extends JMenuItem {
        public JTranslucentMenuItem( String label ) {
            super( label );
            setOpaque( false );
        }
    }

    static class TranslucentPopupMenuUI extends BasicPopupMenuUI {

        public static TranslucentPopupMenuUI createUI( JComponent c ) {
            c.setOpaque( false );
            return new TranslucentPopupMenuUI();
        }

        @Override public void installUI( JComponent c ) {
            super.installUI( c );
            c.setOpaque( false );
        }

        @Override public void paint( Graphics g, JComponent c ) {
            Graphics2D g2 = (Graphics2D)g;
            g2.setComposite( AlphaComposite.getInstance( AlphaComposite.SRC_OVER, 0.25f ) );
            g2.setColor( Color.BLACK );
            g2.fillRect( 0, 0, c.getWidth(), c.getHeight() );
            g2.setComposite( AlphaComposite.getInstance( AlphaComposite.SRC_OVER, 1.0f ) );
            g2.drawRect( 0, 0, c.getWidth() - 1, c.getHeight() - 1 );
        }
    }
}

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