34b4487844
The RNA attribute API did not make sure that attributes are unshared when the data is accessed. This is necessary to avoid accidentally changing data on other geometries. Unfortunately, we currently can't detect if the access is read-only or if the attribute data is modified. Therefore, the data is always copied when it was shared. This makes it a little bit less efficient in some cases, but that should still be ok. The old behavior could by brought back by implementing #112150. Pull Request: https://projects.blender.org/blender/blender/pulls/111514
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