A DESCRIPTION OF THE PROBLEM :
The border which is supposed to paint around a combo box is not painted instead text field is covering the combobox border.


REGRESSION : Last worked in version 10.0.1


---------- BEGIN SOURCE ----------
import javax.swing.*;
import javax.swing.plaf.basic.BasicComboBoxEditor;

public class ComboUI {
    public static void main(String[] args) throws ClassNotFoundException, UnsupportedLookAndFeelException, InstantiationException, IllegalAccessException {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        JFrame frame = new JFrame();
        JPanel panel = new JPanel();
        JComboBox comboBox = new JComboBox(new Object[] {"apple", "ball"});
        comboBox.setEditable(true);
        //Reproducible as BasicComboBoxEditor call's setBorder(null)
        comboBox.setEditor(new BasicComboBoxEditor());
        panel.add(comboBox);
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}
---------- END SOURCE ----------

FREQUENCY : always