Loop cut geometry movement gets undone by shape keys unless edit mode is toggled #122595
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Reference: blender/blender#122595
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System Information
Operating system: Linux-6.9.1-arch1-1-x86_64-with-glibc2.39 64 Bits, WAYLAND UI
Graphics card: AMD Radeon RX 7900 XTX (radeonsi, navi31, LLVM 17.0.6, DRM 3.57, 6.9.1-arch1-1) AMD 4.6 (Core Profile) Mesa 24.0.7-arch1.3
Blender Version
Broken: version: 4.2.0 Alpha, branch: main, commit date: 2024-05-31 20:55, hash:
0d7d6b00c9ec
Worked: maybe never? Also fails in 3.3
Short description of error
Sometimes when making a model I need to add more geometry to some regions by adding loop cuts. If my mesh has shape keys then I often get strange and inconsistent results. It seems that if you add a loop cut and move or slide the new geometry without exiting edit mode in-between, all shape keys will now undo the move/slide.
I find this quite unexpected, I'm not sure if it's supposed to be a feature, it would always catch me by surprise and mess up a lot of my shape keys
Exact steps for others to reproduce the error
Ctrl E -> edge slide
Expected behavior:
Do the same but only do a loop cut without sliding, then exit edit mode, then enter edit mode again and slide it down 75% separately, and the behavior changes - the shape keys now have no effect (which is what I would expect)
See a demonstration here: https://youtu.be/G1uQ7ubqi7w
Thanks for the report. Can confirm