Issues noted when comparing 4.12.1 to 4.13.0 : Scrolling entries inside a settings window: Appearance > Icons Keyboard > Application Shortcuts Settings Editor > any setting pane when sufficient to require scrolling eg. keyboard shortcuts Scrolling of bars controlling time : Keyboard > Behaviour Mouse > Devices Mouse > Behaviour Power Manager > System, Display and Security Permanently 'greyed' labels: Power Manager > System, Display and Security Missing Icons: Setting Editor
I spent some time testing scrolling in the Settings Manager and found some inconsistencies. 1. The scroll is received by the correct widget. 2. When embedded as a socket, widgets act very differently: - Scrolled windows ignore them entirely. - Scales detect the event and perform the stuck animation (pulsate). - Combo boxes and spin buttons both work as expected. It seems like this is probably a bug in GTK 3. Socket windows are X11-only with GTK 3 and likely gone for GTK 4, so the odds of getting support for this are probably low... though we should try anyway.
Digging even further, I've determined that it seems to be related to the smooth scrolling implementation in GTK 3. With a mouse wheel, every scroll event is a stop scroll event, which is only meant to be sent at the end of a touchpad scroll event.
*** This bug has been marked as a duplicate of bug 14285 ***