/// <summary>
/// If the graph <c>target</c> has parent, it will move to its level (one level closer to the root)
/// </summary>
/// <param name="target">The graph that is moving</param>
/// <param name="flags">The operation flags</param>
/// <returns></returns>
public static IGraphNode RetreatToParent(this IGraphNode target, graphOperationFlag flags = graphOperationFlag.mergeOnSameName)
{
if (target.parent != null)
{
return(target.MoveTo(target.parent, flags));
}
return(target);
}