e952083652
This happens even though there is only one user. The Outliner only implements this `Make Single User` for worlds (`singleuser_world_fn`) and actions (`singleuser_action_fn`) [it is questionable if the whole functionality could be removed really, but this is for another report] and it uses `id_single_user` to do so -- this function does not check if we even have more than one user though, so data gets duplicated resulting in duplicate worlds or actions even if they only have one user and shouldnt be touched. Now let `id_single_user` check usercount and only act if we have more than one real users. Pull Request: https://projects.blender.org/blender/blender/pulls/105991
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