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Assert entering editmode with a UVEditor open
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Description

System Information
Operating system: Linux-5.2.8-200.fc30.x86_64-x86_64-with-fedora-30-Thirty 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.26

Blender Version
Broken: version: 2.81 (sub 3), branch: master, commit date: 2019-08-23 02:03, hash: rB232049dd9408
Worked: I think before rBd357e7b06535

Short description of error
Assert entering editmode with a UVEditor open

Exact steps for others to reproduce the error

  • launch blender --factory-startup
  • split the 3DView
  • change left Editor Type to UV Editor
  • change to editmode in the 3DView
  • move mouse back to UV Editor --> boom
BLI_assert failed: /blender/source/blender/draw/intern/draw_cache_extract_mesh.c:525, extract_tris_finish(), at 'mr->cache->surface_per_mat[0]->elem == ibo'