On linux/GNOME 3 (3.30) The qtf text is unreadable under dark themes and it seems impossible to change it from within theIDE.
This happens with every dark theme (including the default Adwaita-dark).
Screenshot (with Adwaita dark):
Best regards,
Oblivion
I have commited the temporary fix.
In general, the problem here is that we need to 'reinterpret' colors set for white theme over to the dark (because those texts are after all written for white theme).... At least, this conversion is now refactored into two PaintInfo methods (ResolveInk and ResolvePaper).