Comment 22 for bug 1240957

Upstream commited what they think is a fix for the issue:
https://git.gnome.org/browse/gtk+/commit/?id=4168c3cab9cb17bb4c75bd2f60c13c149afbf29c

It would be nice if somebody having the issue could try if that really fixes it for them (I've never been able to reproduce/notice the said bumpy scrolling here so I can't really test)

If you do that, backporting https://git.gnome.org/browse/gtk+/commit/?id=962415aeb7e9e47f61c006a5d817a15d181c5055 as well would be useful (it gives extra debug infos, which might be useful if somebody still get the issue)