(Gajim was gnomed since June actually, Void Linux repos didn’t update to the new iteraction until a few days ago though so I wasn’t aware.)
Gajim was the best XMPP client for desktops, with a nice UI and all the features I’d ever need in a messenger (YMMV).
So of course it should have been turned upside-down with a UI redesign that removes compatibility with GTK3 themes while also looking extremely out of place on my system. Modern GUI design suck SO MUCH.
This sounds like you have beef with the developer.
What’s this post about?
I don’t, they are free to change their software any way they want to, and I’m free to not like the changes they’ve made.
Try taking an old git version and applying only the patches you need.