Linux Mint Is Embracing the GTK4 Future, on Its Own Terms
Linux Mint can't fork every GNOME application, but it's not giving up on theme support entirely.

Linux Mint has forked and modified many GNOME and GTK applications to keep them working with the Linux distro’s custom theme support. The team is now trying a new approach that would allow more current apps to work, without extensive modification or fully killing theme support.