// action: voidfunc(S item)
static void listPopupMenuItemsThreaded(final JList list, O... params) {
  for (int i = 0; i+1 < l(params); i++) {
    fO action = params[i+1];
    listPopupMenuItem(list, str(params[i]), voidfunc(fS item) {
      thread-messagebox {
        callF(action, item);
      }
    });
  }
}