static JComboBox getFocusOwningComboBox() {
  ret swing(() -> {
    Component focusOwner = getFocusOwner();
    for (JComboBox cb : allSwingComponentsOfType(JComboBox.class)) {
      ComboBoxEditor editor = cb.getEditor();
      if (editor == null) continue;
      Component c = cb.getEditor().getEditorComponent();
      if (c == focusOwner)
        ret cb;
    }
    null;
  });
}