static Set<Component> allAWTComponents_extraList = weakHashSet();

static L<Component> allAWTComponents() {
  if (headless()) ret emptyList();
  ret swing(func -> L<Component> {
    flattenList2(
      map allChildren(allWindows()),
      cloneList(allAWTComponents_extraList),
      
      // now illegal:
      // callOpt(SwingUtilities.class, 'getSharedOwnerFrame)
    )
  });
}