Bastien Montagne
6426de4489
A few ID types are considered as 'never unused' in Blender (UI related ones, the Libraries and the Scenes). Local IDs of this type are always considered as used, even if no other ID links to them. This was previously fairly weekly defined and implemented (mainly in the writefile code and the 'tag unused' libquery functions). This commit formalize this characteristic of ID types by adding a new `IDTYPE_FLAGS_NEVER_UNUSED` flag, and using this in the few places in the code that handle unused IDs.
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