FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b14)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Calling getPreferredSize on an editable JComboBox, when using Nimbus Look & Feel, messes up the layout.

The submitted test program shows the messed up layout. Leaving the method call to "edit_combo.getPreferredSize()" out solves the layout problem.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The submitted test program shows the messed up layout. Leaving the method call to "edit_combo.getPreferredSize()" out solves the layout problem.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Editable combo box layout should be correct.
ACTUAL -
Editable combo box height is messed up.

REPRODUCIBILITY :
This bug can be reproduced always.

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

public class TestNimbus {
  public static void main( String[] args ) throws Exception {
    UIManager.setLookAndFeel( "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel" );

    Object[] data = {"Jan", "Piet", "Joris", "Korneel"};

    JComboBox combo = new JComboBox( data );

    JComboBox edit_combo = new JComboBox( data );
    edit_combo.setEditable( true );

    //This line causes layout to be messed up !!! If left out, it works.
    edit_combo.getPreferredSize();

    JToolBar tb = new JToolBar( );
    tb.add( combo );
    tb.add( edit_combo );

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

    Container content = frame.getContentPane();
    content.setLayout( new BorderLayout() );
    content.add( tb, BorderLayout.NORTH );

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

  }
}

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