static bool replaceTreeNodeChildren(final DefaultMutableTreeNode node, fL children) {
  if (node == null) false;
  ret swing(func -> bool {
    L oldChildren = mapMethod('getUserObject, node.children());
    if (eq(oldChildren, children)) false;
    node.removeAllChildren();
    for (O c : children)
      node.add(new DefaultMutableTreeNode(c));
    true;
  });
}