artefacts for edit mesh drawing of in front objects #66335

System Information
Operating system: Linux-4.13.10-041310-generic-x86_64-with-debian-stretch-sid 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.67

Blender Version
Broken: b1af682001 till today 1278853849
Worked: 427c75e4c2

Short description of error
Objects set to show in front, when drawn in edit mesh mode, will display artefacts resemlbing z-fighting.

artefacts_for_edit_mesh_drawing_of_in_front_objects.blend

Exact steps for others to reproduce the error

open the blend
notice the artefacts on the plane object to the right

Based on the default startup or an attached .blend file (as simple as possible).

Added subscriber: @MACHIN3

Added subscriber: @mano-wii

The problem is more visible when orbiting the view.

Added subscriber: @fclem

Not sure what is happening. Might be that the workbench ghost resolve pass effects the actual depth slightly (conversion). @fclem do you have any ideas what might be happening here?

Added subscriber: @jfmatheu

Have this issue too, I note that it disappears when activating the option to display modifier in edit mode (like Mirror modifier)

2019-07-24 18-52-14.mp4

Added subscriber: @MiroHorvath

@Jeroen-Bakker, @fclem
It seems that any object placed other than to (0,0,0) is having this issue. In the attached file just reset plane's position(ALT+G) and problem is gone.

Very interesting observation, can confirm.

After refactoring the overlay engine, it draws more consistently, but does not draw the edit faces. Seems like a different problem we are currently facing. #72261 (Edges and faces almost invisible when object "In front") is already open for that one. So closing this one

Changed status from 'Open' to: 'Resolved'

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artefacts for edit mesh drawing of in front objects #66335