d1962be44c
Other code that needs to operate on "the Action that's shown in the Dope Sheet" now accesses the newly-added `bAnimContext::active_action`, which is now also used by `context.active_action`. I've also added `bAnimContext::active_action_user` in case the ID that is animated by this Action is needed. That's either the active `Object` or the active `Key`, again depending on the mode of the Dope Sheet editor. The active Action can also be obtained via `ANIM_active_action_from_area(scene, view_layer, area)`. This is a faster method than the usual `ANIM_animdata_get_context(C, &ac)` and it doesn't need the entire `bContext`. The "Stash Action" and "Push Down Action" to the NLA were also implemented by writing to `SpaceAction::action` via RNA. They now use `ANIM_animdata_get_context()` to get the active action owner ID, and a direct call to `blender::animrig::assign_action()` instead. The remaining use of `SpaceAction::action` was for display & manipulation of Scene/Action markers. This required some work to get addressed, as there was quite a bit of spaghetti and duplicate logic to churn through. More can be improved there, but I had to limit the time I spent on this. Python code that was still using `context.space_data.action` to find the currently-showing Action has been migrated to `context.active_action`. Related: #119626 Pull Request: https://projects.blender.org/blender/blender/pulls/145672
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