9a3e102853
Since the `overlays_enabled` optimizations were introduced in
fe39456ba5, it has been a constant
source of bugs: #113741, #116403, #120628, #125414
There are many cases where the code expects to have the Workbench
depth available even when overlays are disabled.
So this simply disables the optimization and ensures the depth buffer is
always valid.
Pull Request: https://projects.blender.org/blender/blender/pulls/125447