I searched PopOs! repos and I couldn't find where they maintained their Gtk-3.0 patches or code. It didn't look to me like they altered Gtk-3.0 itself at all an

I searched PopOs! repos and I couldn't find where they maintained their Gtk-3.0 patches or code. It didn't look to me like they altered Gtk-3.0 itself at all and likely just altered individual applications.