private @NotNull ActionGroup createChangesTreeActions() {
    DefaultActionGroup result = new DefaultActionGroup();
    result.add(new ShowDifferenceAction());
    result.add(new RevertSelectionAction());
    result.add(Separator.getInstance());
    result.add(ActionManager.getInstance().getAction(ChangesTree.GROUP_BY_ACTION_GROUP));
    return result;
  }
private @NotNull ActionGroup createChangesTreeActions()