Jacques Lucke
ff4959eeaa
Many modifiers and other places use `CustomData_copy_data` to copy data between different meshes. This function assumes that assumes that the source and destination `CustomData` objects are "compatible" in some way. Usually modifiers use `CustomData_copy` to create a compatible new `CustomData` on the new mesh. The issue was that the optimization I added for anonymous attributes broke this compatibility. It avoided copying some attributes when they are no longer used. This lead to attributes being copied incorrectly. D13083 contains ideas for how this could be fixed more generally. For now I just removed the optimization. Differential Revision: https://developer.blender.org/D13083
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