Ghost Edges Stay Behind In Some Cases

[jmwright]

Platform: Debian 12, AMD 64

How to reproduce:

1. Run the following code:

import cadquery as cq
spacer = cq.Workplane().box(24, 60, 10)
show_object(spacer)

2. Select the rendered box in the 3D window.
3. Change Y dimension of box from 60 to 50.
4. Hit Ctrl+S (this is important, the bug will not be reproducible otherwise)
5. Change Y dimension of box back to 60.
6. Hit Ctrl+S again

Ghost edges should appear in either step 4 or step 6. It's like the 3D render is not being reset properly when auto-execute on save is triggered.

[jmwright]

I've tracked this bug down to PR #233 being merged. I am going to have to revert that merge for now.