static <A> void setComboBoxItems_notifyListeners(JComboBox<A> cb, Cl<A> items) {
  if (cb != null) swing {
    if (eq(getComboBoxItems(cb), items)) ret; // nothing to do
    
    var sel = getSelectedItem_typed(cb);
    setComboBoxItems(cb, items);
    var item = getSelectedItem_typed(cb);
    if (!eq(sel, item)) {
      // restore old selection if possible
      if (sel != null && contains(items, sel))
        setSelectedItem(cb, sel);
      else {
        //printVars("combobox", +sel, +item);
      
        // force onChange event(s) (need to use two events)
        setSelectedItem(cb, (A) null);
        setSelectedItem(cb, item);
      }
    }
  }
}

Began life as a copy of #1009086