/// <summary>
/// Sets a <see cref="IItemFactory.SetTemporaryPortConstraint">temporary west port constraint</see>
/// on <paramref name="source"/> or target side of <paramref name="edge"/>
/// </summary>
private static void ConstrainWest(Edge edge, bool source, IItemFactory itemFactory)
{
itemFactory.SetTemporaryPortConstraint(edge, source, portConstraintWest);
}