Regression: stale BMesh UV data #121004
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Reference: blender/blender#121004
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System: Windows 10
Broken: Blender 3.5.0, 4.1.1, 4.2.0-alpha-main-ce768d43a121
Worked: Blender 3.4.1
Caused by
6c774feba2Short description of error
The mesh looks visibly different depending on whether or not the bmesh is assigned its own copy before doing a limited dissolve.
Exact steps for others to reproduce the error
Run the script in the attached file with and without uncommenting the line.
Additional info
If the copy is not assigned, limited dissolve behaves as if there was no 'UV' delimiter. If it is assigned, dissolve behaves as expected. In 3.4 and earlier it behaves as expected with or without copying.
As an alternative to assigning a copy, laundering through to_mesh > clear > from_mesh also gives the desired result.
Can confirm, will check
Caused by
6c774feba2I think I have a fix, will double-check though why exactly this is needed...
Seems like the same thing but in bpy.ops: #107620
Fix is up, see !121033
Nope, that is different (and also not working right in 3.4.1)
The logic is possibly similar (wrong offsets to data), as clearing custom normals seem to fix it for the other issue.