@NotNull
  public static VcsTreeModelData allUnderTag(@NotNull JTree tree, @NotNull Object tag) {
    assert tree.getModel().getRoot() instanceof ChangesBrowserNode;

    ChangesBrowserNode<?> tagNode = findTagNode(tree, tag);
    if (tagNode == null) return new EmptyData();
    return new AllUnderData(tagNode);
  }
@NotNull
  public static VcsTreeModelData allUnderTag(@NotNull JTree tree, @NotNull Object tag)