static DefaultMutableTreeNode jDynamicTree_findNode(final JTree tree, fO data) {
  ret swing(func -> DefaultMutableTreeNode {
    Enumeration e = ((DefaultMutableTreeNode) tree.getModel().getRoot()).breadthFirstEnumeration();
    while (e.hasMoreElements()) {
      DefaultMutableTreeNode n = cast e.nextElement();
      if (eq(n.getUserObject(), data)) ret n;
    }
    null;
  });
}