f933dae207
The idea is to allow iterating over e.g. all ID usages of a node from a whole nodetree, using the same generic handling as existing 'whole ID' `foreach_id` code. This is necessary in some cases wher a sub-data needs to processed independently from any 'owner ID', e.g. in some copy/paste handling. This is a pre-requirement for proper fix of nodes copy/paste (see e.g. #120103). Pull Request: https://projects.blender.org/blender/blender/pulls/121018
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