Adapting to the future of app theming

[tkn]

About gtk-4 showing light themes while everything else is dark:
I encountered the same some time ago and wrote this solution.
If the first tip doesn't work then the second one will:

How to set dark mode for GTK4 apps when using a GTK2 theme

Since my favourite theme on my ThinkPad T420 is Ambiant-MATE-Dark-Red it pained me to discover that GTK4 apps (like transmission) completely ignore this, rendering a light window (which sticks out like a sore thumb). However, after executing the following command: gsettings set org.gnome.desktop.interface color-scheme 'prefer-dark' ... and a reboot (or "logout and login") the GTK4 apps will be rendered in dark mode. It still looks a bit off, of course, but it is at least a bit more acceptabl…