474abdd7eb
Proper fix, using `RNA_def_property_enum_bitflag_sdna` to mask the affected bitflags when setting the value, and not overwrite unrelated other bitflags. Also similar fix/cleanup in DataTransfer modifier, who was also using custom setters to handle this masking, instead of defining the properties with `RNA_def_property_enum_bitflag_sdna`. And added some documentation to `RNA_def_property_enum_sdna` and `RNA_def_property_enum_bitflag_sdna`, to try to make it more explicit what they are doing and what are their expected usecases.
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