6e75581e65
While embedded IDs are usually considered as private local data of their owner ID, some areas of code, like the depsgraph, can consider them as regular IDs in some aspects. So when swapping IDs, also properly 'counter-swap' their potential embedded IDs, such that the pointers to the embedded IDs remain as before swapping, even though the data of the embedded IDs is swapped. The main target of this change is memfile undo code. There, newly read IDs are swapped with their oldder version, so that the old address contains the new data. This allows to avoid rebuilding some of the depsgraph. Doing the same thing for embedded IDs should reduce even further the needs for depsgrah rebuilds on undo steps. This commit also gives more control over the remapping of 'self' ID pointers inside themselves. Pull Request: https://projects.blender.org/blender/blender/pulls/107044
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