b71fed904b
This commit removes the F-Curve handling from the legacy Curve edit mode undo code. The legacy Curve edit mode uses the per-mode undo system. This tried to deal with changes in the animation data as well, but did so in a very limited way. Only F-Curves were copied & restored, which means the Action Groups were effectively deleted as soon as you undo something. Furthermore, the code wasn't updated for slotted Actions yet, so effectively it was a no-op, because it only saw the always-empty legacy `Action::curves` field. Fixing this properly would mean discarding this undo code, and moving to the global undo system, as the animation editors allow changing the animation of anything in the scene, not just the Curve data-block that is being edited. Since the legacy curve ID type is, well, legacy, I don't think it's worth going this route. This is a non-functional change, as `action->curves` is always empty, and so nothing was backed up or restored anyway. Pull Request: https://projects.blender.org/blender/blender/pulls/135585
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