Upstream bugreport of https://bugzilla.redhat.com/show_bug.cgi?id=1226465 Description of problem: Plasma 5.3 Kf 5.10: I noticed that many times if you try to use mouse-scroll-wheel on GTK applications, the scrolling will not work until you click on the application or you manually use the scrollbar. One example? Firefox Reproducible: Always
*** This bug has been marked as a duplicate of bug 348270 ***