Created attachment 1140837 [details] Screenshot of wider scrollbars In Fedora 24, scrollbars in Firefox (firefox-45.0.1-2.fc24.x86_64) are wider than scrollbars in other apps that are GTK-based which feels inconsistent. See the attached screenshot.
Same issue. Confirm. Actually. that's really annoying and Jiri didnt mention it: when I browse a page and want to scroll it - I automatically move mouse cursor to (for example) bottom right edge of the screen an click - so, the page scrolls down. This bug creates space between screen's edge and scrollbar - so, I must change focus from page's content to aim scrollbar. That's awful. Also, I use Vertex-theme (already 3.20 compatible) and with it enabled, I can't see the scrollbar tumbler (or how it calls). Original version (downloaded from mozilla's site) is free of these bugs.
Jhorak is our scrollbar expert.
https://developer.gnome.org/gtk3/unstable/GtkScrollbar.html Looks like gtk queries "contents" css node for the size, but we don't have such node in our css tree and ask trough for it. We may adopt our code to the one from https://git.gnome.org/browse/gtk+/plain/demos/gtk-demo/foreigndrawing.c
Upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1289148
We're going to track it on upstream.