2ce3e8c877
Add a precondition check that verifies all to-be-joined armatures are unique. If this is detected, an error is shown and the operator is aborted. Joining shared Armatures is non-trivial, because the corresponding pose bones may actually have different drivers or constraints on them (because those live on the Object ID, and not the Armature). Duplicating any shared Armature ID could be a first step, but I am not convinced this is always the right approach. This is why joining shared Armatures is not supported for now. Users can choose how to make each Armature unique, either by deselecting objects or by duplicating their data. Pull Request: https://projects.blender.org/blender/blender/pulls/140971
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