Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: rB5be9ef417703
Short description of error
Trying to perform a redo on brush strokes performed right after adding a multires subdivion level either don't work at all or merge brushstrokes together.
This behaviour was discovered after finding an undo bug in Release Candidate for 2.92
Exact steps for others to reproduce the error
- Create New Scene -> Sculpting
- Add Multires Modifier
- Press "Subdivide" (doesn't matter how often)
- perform a few brush strokes on the mesh and then perform as many undos (until the sphere is clean again)
- perform redos of these brushstrokes
Sometimes two strokes reappear at once sometimes they are additionally clipped.
Demo video recorded with the steps above: