**System Information**
Operating system: Linux-5.4.0-80-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.91.03
**Blender Version**
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-08-10 21:06, hash: `rBfcd2d63b644e`
Worked: 2.79 sort of
**Short description of error**
Wireframe = 0 should hide all the coplanar edges, but doesn't do that.
Also, there is an uncertainty in behavior with decimate modifier and triangulation. Switching triangulation back and forth sometimes lead to different wireframe overlay results.
While it does something to the monkey and the quad cube, it fails on the triangulated cube and does nothing to the cap of the cylinder (hide one edge only).
2.79 didn't have the angle threshold, but it used to hide coplanar edges at least.
{F10278839}
{F10278841}
There is an explanation of the problem on [[ https://devtalk.blender.org/t/blender-2-8-wireframes-discussion/666/408?u=1d_inc | devtalk ]] as well.
**Exact steps for others to reproduce the error**
In the video