But the colour scheme does hijack the font weight and colour and there is no way to disable that. If the rest of the application follows the system wide theme colours and the weight chosen by the user in the preferences, the editor window should do the same unless the user intentionally selects a colour scheme.
Almost all other Gtk editors (Gedit, Mousepad, Leafpad, Bluefish, Pluma, etc) have schemes that can be disabled, and are all disabled by default and inherit the system theme colours and chosen font weight from the preferences unless explicitly asked not to by the user via colour scheme.
This is a different issue than the initial report, sorry for the initial misunderstanding. If you think this is worth discussing I can open another issue with a proper title and better summary. If not that's okay too, thank you for the help. Either way you can close this if you'd like. Thanks for your responses and thoughts (and work on this program is greatly appreciated, I do love it).