Editable JComboBox Popup is 1 to 2 pixel wider than JComboBox textfield. This can be observed only in pit build. It looks fine 6u5_b03 promoted build. Hence  its a regression . I have attached screen shot of the same. The bug is reproduced in all platform. 

Step to reproduced.
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1) Run the testcase.
2) Click on the arrow button of the editable comboBox & observe that popup is wider than the textfield. If you see the same then the bug is reproduced. 


source begin
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import javax.swing.JFrame;
import javax.swing.JComboBox;

public class NimusPITBuildJComobBoxBus {
	private JFrame frame=null;
	private JComboBox comboBox=null;

	NimusPITBuildJComobBoxBus(){
		frame = new JFrame();
		frame.setLayout(new java.awt.FlowLayout());
		comboBox = new JComboBox();
		comboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "NimbusLAFItem 1", "NimbusLAFItem 2", "NimbusLAFItem 3", "NimbusLAFItem 4", "NimbusLAFItem 5", "NimbusLAFItem 6", "NimbusLAFItem 7", "NimbusLAFItem 8", "NimbusLAFItem 9", "NimbusLAFItem 10" }));
		comboBox.setEditable(true);
		frame.add(comboBox);
		frame.pack();
		frame.setVisible(true);
	}

	public static void main(String []args){
		javax.swing.SwingUtilities.invokeLater(new Runnable(){
			public void run(){
				new NimusPITBuildJComobBoxBus();
			}
		});
	}
}
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source end