HC: icon theme broken for gtk4
When looking at some weird icon fallback in adwaita-icon-theme, it came to surface gtk4 and gtk3 differ in how they look up high contrast icons. This probably has multiple layers in need of fixing:
- Check the symbolics in gtk4 and update their style
- Make sure HC doesn't exclude the lookup of a-i-t. Could it possibly be pulling these icons from gnome-icon-theme-extras? Don't quite understand where those icons are coming from.
- There might be a rule to force symbolic icons everywhere for HC, which I'm not sure about being a good thing.