2b0caf00a8
RNA pointers should always have valid owner IDs. And most structs using STRUCT_UNDO do not need it because the owner is a UI datablock which already determines if undo is needed. With this change, it is possible to have structs used both in UI and scene datablocks and have undo work depending on the owner. This is needed for collections storing operator properties for export (#116646). Pull Request: https://projects.blender.org/blender/blender/pulls/117640
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