Test Scenario : Type characters into editable JComboBox.
Step to reproduce:
1) Run the attached test
2) When the frame is visible. Click on the JComboBox which has the Title border. Observe that JComboBox popup is visible.
3) I was expecting the popup to be visible below the Editable JComboBox textfield but popup is seen above the editable JComboBox textfield.
4) Try typing characters into the editable JComboBox textfield . You will not the see the character that is getting typed since popup blocks the user from seeing.
If you observe the same then the bug is reproduced.

This does happen when editable JComboBox with out titleBorder or border set.

This works fine in Java Look and feel