I want to port a theme made for GTK3 to GTK4. My first instinct was to just copy-paste the theme and resolve the problems that arise. This works to an extent but there’s a lot of subtle problems that are not trivial to resolve. For example, the way GTK4 does window decorations is very different.
The GTK3 to GTK4 migration page outlines some changes to the CSS, and I understand that I should remove CSS belonging to removed widgets. But as far as I’m aware there’s no dedicated changelog or migration guide relating to styling or theming, is there? What is my best course of action?