63adbb19fb
When creating Action Slots for legacy Actions, always name those slots "Legacy Slot". Before this commit, the slot was named after the ID that is animated by the Action; this matches what Blender will do when animating that ID from scratch. The old versioning behaviour caused issues when dealing with legacy Actions: if there are multiple Actions in a file (for example multiple run cycle animations) and only one of those was assigned to the character (the rest has a fake user), Blender would only name that one action slot after the character. The "fake user" Actions would just be get a slot named "Slot". This causes issues when toggling between the different Actions, as Blender will not automatically assign a slot when switching from the character- named one to the "Slot" one. Ref: #129563, #130261 Pull Request: https://projects.blender.org/blender/blender/pulls/131425
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