svoid internalFramePopupMenuFromActions_threaded(Container f, L<AbstractAction> actions) {
  if (!f instanceof JInternalFrame) ret;
  for (final AbstractAction a : unnull(actions))
    if (a != null)
      internalFramePopupMenuItem(f/JInternalFrame, str(a.getValue(Action.NAME)), r-thread { callAction(a) });
}