d426813da4
Add a comment that documents the assumption that a node tree can only be embedded by animatable ID types. At this moment this assumption holds. `blender::animrig::internal::rebuild_slot_user_cache()` uses this for an optimisation. It fully skips all non-animatable IDs, and would therefore also not see any hypothetically animated node tree embedded in a non-animatable ID type. Pull Request: https://projects.blender.org/blender/blender/pulls/131844
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