bfb6b184f5
Resolve reference counting error in the RNA API which mixed up ownership between ExtensionRNA::data & StructRNA::py_data. In practice this generally worked as RNA_struct_free_extension behaved as if ExtensionRNA owned the reference instead of StructRNA, so as long as only one reference was removed, there wasn't any difference. When re-registering Python classes with RNA, ownership wasn't handled properly which could result in negative reference counts, crashing in some cases.
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