Browser Development • Re: Linux Pale Moon with Qt toolkit

Gimp took over 8 years from 2012 to 2020 to transition from gtk2 to gtk3, and has discussed eventually moving to gtk4 but it will be challenging and they haven't started. As long as gimp is on gtk3 it will be maintained and the distros will have to package it, as gimp is an essential desktop productivity application.

Seems like you could just follow the future path of gimp on desktop GNU/Linux and be relatively safe.