static int comboBoxFindItem_withSimplifier(final JComboBox cb, fS item, fO simplifier) {
  ret cb == null ? null : swing(func -> int {
    ComboBoxModel model = cb.getModel();
    int n = model.getSize();
    for i to n:
      if (eq(callF(simplifier, model.getElementAt(i)), item))
        ret i;
    ret -1;
  });
}