internal static void DoAttach <K, T>(this IAListTreeObserver <K, T> observer, AListBase <K, T> list, AListNode <K, T> root)
{
var childrenFirst = observer.Attach(list);
observer.RootChanged(list, root, false);
if (childrenFirst != null && root != null)
{
AddAllRecursively(observer, childrenFirst.Value, root);
}
}
