SUMMARY *** When trying to scroll down or up while moving mouse within scrollable content - scrolling does not work under x11. Under wayland seems to work fine. Tested with KDE Neon 5.23, Kubuntu 21.10 and Opensuse Tumbleweed *** STEPS TO REPRODUCE 1. Open system settings or folder with lots of files in dolphin etc. under x11 session 2. Dynamically move mouse cursor in whatever pattern - up/down, circles etc. and use mouse wheel at same time, staying within bounds of scrollable content 3. See mouse wheel not doing anything until cursor movement is stopped OBSERVED RESULT Content not scrolling while moving mouse EXPECTED RESULT Content scrolling in addition to cursor movement SOFTWARE/OS VERSIONS Operating System: KDE neon 5.23, Kubuntu 21.10, Opensuse Tumbleweed KDE Plasma Version: 5.23.4, 5.22.5 KDE Frameworks Version: 5.89.0, 5.86 Qt Version: 5.15.3, 5.15.2 ADDITIONAL INFORMATION Tested systems were vmware virtual machines under windows host. Bug does not depend on mouse polling rate (tested with multiple).
Created attachment 144678 [details] Sample bug reproduction video on kubuntu 21.10
Does it happen in GTK or GNOME apps too? Or Electron apps like Discord?
(In reply to Nate Graham from comment #2) > Does it happen in GTK or GNOME apps too? Or Electron apps like Discord? Happens in gnome-software application and Discord. Looks like in Discord the bug also happens on Wayland
Sounds like an X11-specific bug. On Wayland, Discord is running through XWayland, so it's hitting the same bug.