bf9eb57554
The generic Action assignment function tries to find a slot to auto-assign. This would always look at the last-used slot identifier on the ID's `AnimData` struct, even when assigning to an NLA strip or Action constraint. This commit removes the `Action::find_suitable_slot(ID)` method, and replaces it with a `generic_slot_for_autoassign(ID, action, last_slot_identifier)` function. That function basically copies the behaviour of `find_suitable_slot()`, except that it gets the `last_slot_identifier` from the caller. Another difference is that it no longer checks whether the Action is already assigned, and so also never uses the currently-assigned slot handle. In the only code flow that calls `generic_slot_for_autoassign()` this situation would never occur, and thus it's better to delete this dead code. Pull Request: https://projects.blender.org/blender/blender/pulls/131491
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