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Alpha transparency not working with in front geometry
Open, Needs Triage by DeveloperPublic

Description

System Information
Operating system: Linux-5.2.6-arch1-1-ARCH-x86_64-with-arch 64 Bits
Graphics card: GeForce 8400GS/PCIe/SSE2 NVIDIA Corporation 3.3.0 NVIDIA 340.107

Blender Version
Broken: version: 2.80 (sub 75), branch: makepkg, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e

Short description of error
I have a mesh set in front of another one to make retopology, If I go to material viewport display and set the color of the mesh with alpha transparency, the in front property will shut off.

Exact steps for others to reproduce the error
Setup a retopology mesh (You will have intersecting geometry) > Object tab > Viewport display > activate in front > now go to Material tab > Viewport Display > Setup a color (any) > change alpha transparency of the color.

.blend file:

Details

Type
Bug

Event Timeline

I can reproduce, "In Front" option doesn't work when viewport color alpha<1. This feels tricky. So it needs to display in front of everything, but still be "transparent" so it has to show things that are behind it. The use case seems sound though.