static void showChangeHotkeyForm(S hotkeyName) {
  S hot = currentHotKey(hotkeyName);
  final JComboBox cb = jComboBox(concatLists(ll("None"), keys(jNativeHook_keyCodes())));
  selectItem(cb, hot);
  showForm(
    "Current hotkey:", jlabel(or2(hot, "None")),
    "New hotkey:", cb, r {
      S key = nullIfEq("None", selectedItem(cb));
      saveTextFile(hotKey_file("teach"), key);
      infoBox(empty(key) ? "Hotkey removed!" : "Hotkey assigned: " + key);
    });
}