692292536f
When retrieving a color attribute to paint it, the layer data needs to be unshared so that it doesn't modify data from separate meshes. In the past I think we've unknowingly avoided this problem by porting code to the new attribute API. I've been refactoring `PBVH` and `SculptSession` to make that possible (removing the long-lived layer pointers in the two structs). But that wouldn't fit as a bug fix. In the meantime, make sure the color attribute data is un-shared and separate "for read" and "for write" versions of the function. Pull Request: https://projects.blender.org/blender/blender/pulls/114119
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