This commit tries to make the bare minimum changes to add a meaningful
level of support for Action Slots in Rigify:
- You can now select an Action Slot in each Action Set-up, and that
will be assigned to the generated Action Constraints.
- For this to be meaningful, we have to support selecting the same
Action in multiple Action Set-ups, which would previously throw an
error.
- For that to be possible however, it was necessary to make the
trigger selectors of Corrective Action Set-ups select one of the
other set-ups directly, rather than selecting an Action (datablock),
and then making an association to one of the action set-ups based on
that action pointer. (The necessity to allow users to point at
another action set-up was the reason behind not allowing user to use
the same action datablock multiple times.)
Pull Request: https://projects.blender.org/blender/blender/pulls/146182
f5428c51e0