One thing that nags me is that some windows have these "old school" scroll-bars (depicted left), while other applications have the newer hover-activated ones (right). Can somebody elaborate on why this is? I suspect something with GTK2 vs GTK3, right? (I' currently on 17.04, but this applies to earlier versions as well.)
By the way: I don't like both. The left one lacks contrast on the Radiance/Ambiance themes - and I'm constantly searching where the scroll-bar handle is. The other "modern" one, which becomes visible/gets broader on hover, is fiddly and difficult to hit with the mouse. Just my OT 2 cents...
