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Sculpt-mode bug: using mask-tool with hide-function causes mesh to glitch
Closed, ResolvedPublicBUG

Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: rBf1aa4d18d49d
Worked: (optional)

Short description of error
Mesh starts glitching if you use masking tool while some parts of the mesh is hidden. See the glitch in action: https://gfycat.com/scholarlyclassicichidna

Exact steps for others to reproduce the error

  1. Select object and go to sculpt mode
  2. Hide part of the mesh
  3. Take mask brush and mask some other parts of the mesh
  4. Unhide all (alt+h)
  5. Transform the area with rotate-tool. The area you just unhid should start glitching now. If you try to ctrl+z yourself out of the glitch, the glitchy mesh persists and only way to fix it is to reload file