b350d7a4c3
It is very common for graphical editors with layers to support locking individual layers to protect them from accidental edits due to misclicks. Blender itself already supports locking vertex groups. This adds lock toggles for shape keys, with lock/unlock all operators. The flags are checked by sculpt brushes, edit mode transform tools, and Smooth, Propagate and Blend From Shape operators. This selection aims to cover operations that only deform the mesh, where the shape key selection matters. Topology changing operations always apply to all keys, and thus incorrect shape key selection is less impactful. Excluding them from the new feature greatly reduces the patch size. Pull Request: https://projects.blender.org/blender/blender/pulls/104463
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