When clicking on the middle button on a mouse, and move the mouse, you zoom in and out. In pretty much all PDF readers and browsers, you scroll up/down/left/right instead. Adding an option for this behavior would be great.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/2357
Git commit 7717671f0f074bdd0a936d927c7d86ebe47eb46c by Xaver Hugl, on behalf of Evgeny Chesnokov. Committed on 04/07/2024 at 14:49. Pushed by zamundaaa into branch 'master'. kcms/mouse: add support for On-Button scrolling Now you can scroll the page when you press the middle mouse button Related: bug 416633, bug 429759, bug 477548 M +7 -1 kcms/mouse/backends/kwin_wl/kwin_wl_device.cpp M +23 -0 kcms/mouse/backends/kwin_wl/kwin_wl_device.h M +17 -5 kcms/mouse/backends/x11/x11_libinput_dummydevice.cpp M +24 -0 kcms/mouse/backends/x11/x11_libinput_dummydevice.h M +11 -0 kcms/mouse/inputdevice.h M +17 -0 kcms/mouse/ui/main.qml https://invent.kde.org/plasma/plasma-desktop/-/commit/7717671f0f074bdd0a936d927c7d86ebe47eb46c