408a0b58d4
The issue here was that when an archive library ID is read from blendfile (memfile undo buffer in that case), a new split main is immediately created for it in `direct_link_library`, and the newly read Library is assigned to its `Main::curlib` pointer. However, in undo readfile code, when an old matching ID is found, the new data is moved into that old address, to avoid modifying all other unchanged ID using that re-read data-block. For (archive) libraries, it means that their split main `curlib` pointer also needs to be re-assigned to the re-used old address. Pull Request: https://projects.blender.org/blender/blender/pulls/147744
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