internal static void HandleNodeReplaced <K, T>(this IAListTreeObserver <K, T> self, AListNode <K, T> oldNode, AListNode <K, T> newLeft, AListNode <K, T> newRight)
{
if (newRight == null)
{ // cloned, not split
Debug.Assert(oldNode.IsFrozen && !newLeft.IsFrozen);
Debug.Assert(oldNode.LocalCount == newLeft.LocalCount);
}
self.RemoveAll(oldNode);
self.AddAll(newLeft);
if (newRight != null)
{
self.AddAll(newRight);
}
}