446f0a806e
Split the versioning of legacy Actions to slotted ones into two steps: 1. Versioning the Actions themselves, in the regular versioning code (`do_versions_after_linking_400`). This has to happen in the 'after linking' stage, and not in the 'before linking' stage, as there's older 'after linking' code that will break when it gets fed slotted actions. Any ID that is using a legacy Action will get tagged. 2. Versioning Action assignments, where the correct Action Slot has to be chosen & assigned for each tagged ID. This has to happen in the `do_versions_after_setup` stage, as choosing a slot requires that the actions (both local & linked) have been converted already. This also includes some necessary changes to the pre-2.50 Action versioning code. Note that this change does not handle library overrides. That's dealt with in !131426. Pull Request: https://projects.blender.org/blender/blender/pulls/131627
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