409697a962
`AnimData`, NLA strips, and action constraints all have an `action_slot_name` field in RNA. The purpose of this field is to store the identifier of the most recently assigned slot, so that it can be used for auto-assignment when later assigning different actions. However, this field name is misleading in two ways: 1. In accordance with #130740, it's actually the slot *identifier*, not name. 2. It could be mistaken as a way to rename the currently assigned slot, which it is not. To resolve both of those issues, we're renaming the field to `last_slot_identifier`, which better communicates its actual nature. As a bonus, this also ends up decluttering Python autocomplete when looking for things related to action_slot. Ref: #130892 Pull Request: https://projects.blender.org/blender/blender/pulls/130911
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