GitLab

• Decide on title areas API and implement it, see https://gitlab.gnome.org/GNOME/gtk/issues/2242
• Try to optimize the masking further
• Figure out something for default titlebars
• Figure out something for GtkApplicationWindow menubars (document they are unsupported)
• Figure out something for server-side decorations (that's not supported case, but it shouldn't glitch out still)
• Docs
• Tests (though there's just _new() in each class, so not much)
• Figure out something for dialogs (!434 (merged) drops them)
• Reorganize the example to actually take advantage of this
• Figure out what to do wrt leaflet+titlebar (!439 (merged))
• Window crashes with no children (!440 (merged))

I have a titlebar widget in the Vala prototype that I didn't port over yet, because I don't particularly like the API. Tried to catch Company today unsuccessfully to discuss it, so it's blocked on that :)

Fixes #231 (closed)