Properly remap nodes' pointers to copied IDs in copied ntrees. Note that this only affects root trees, node groups are not concerned here, since they are assumed to be reusable chunks and hence *not* duplicated.
Properly remap nodes' pointers to copied IDs in copied ntrees. Note that this only affects root trees, node groups are not concerned here, since they are assumed to be reusable chunks and hence *not* duplicated.