@Nullable
    private static GroupTreeNode findParentGroupTreeNode(@NotNull TreeNode treeNode) {
      TreeNode currentNode = treeNode;
      while (currentNode != null && !(currentNode instanceof GroupTreeNode)) {
        currentNode = currentNode.getParent();
      }
      return (GroupTreeNode)currentNode;
    }
@Nullable
    private static GroupTreeNode findParentGroupTreeNode(@NotNull TreeNode treeNode)