🐛 Bug report | Mesh lines not displayed on shells rendered as solids

[stevenlabelle]

Description:
When "Render shells as solids" is enabled, lines between shells do not render.

Version:
3.0.0.544738437

Steps To Reproduce:

1. Open a model with shells and enable mesh visualizations.
2. Toggle solid rendering (Model tree > View > Model name > Render shells as solids)