The styling is done via CSS, and works on Windows - more precisely, labels that should be bold appear as such on Windows, and looking at the CSS node for font-weight for one of the labels via GTK_DEBUG=interactive confirms that it is bold. Both OSes are using the same font-family of Sans. It looks like so:
Raspbian, however, seems to ignore the font-weight property: inspecting it via that interactive debug window shows it as 'normal'. It looks like this:
What I've tried to fix the issue:
- Setting the style provider priority: It's set to 'STYLE_PROVIDER_PRIORITY_USER'.
- Checking /home/pi/.config/gtk-3.0/gtk.css: It's free from any font related CSS nodes.
- 'Forcing' the font-weight node to be bold via the CSS tab in the interactive debug window: Doesn't change anything. Changing other properties within this window (like font color, for example) does work, however. Seemingly only font-weight doesn't work.
Am I encountering a GTK bug, or is there some other Raspbian config that I don't know about that needs changing?