I have an old Metacity titlebar theme I would like to convert to a CSS format for GTK3/4. It is my understanding the GNOME deves will eventually break compatibility for the older Titlebar themes, so I’d like to find how to convert the old Metacity files to the newer format, so that I can have proper and separate Titlebars (and not HeaderBars).
This would be to use with the Muffin window manager rather than Mutter, in case it needs different tags.
So the NEXT question is, how do I re-create these in GTK3/4? Right now all I see for the newer GTK systems is fugly, flat and featureless titlebars (and yes, I mean TITLEBAR, not that hacked up headerbar that can’t decide if it’s a titlebar or toolbar).