svoid dm_setTrayIcon_left(final JComponent icon) {
  final DynModule dm = dm_current_mandatory();
  swing {
    temp dm.enter();
    JComponent oldIcon = cast dm.transientGeneralMap.get('trayIcon);
    dm_removeTrayIcon(oldIcon);
    mapPutOrRemove(dm.transientGeneralMap, trayIcon := icon);
    dm_addTrayIcon_left(icon);
  }
}