[systemsettings] [Bug 403842] New: Libinput mouse KCM lost the scroll speed setting that was present in the evdev version

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=403842

            Bug ID: 403842
           Summary: Libinput mouse KCM lost the scroll speed setting that
                    was present in the evdev version
           Product: systemsettings
           Version: 5.14.90
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: kcm_mouse
          Assignee: unassigned-bugs at kde.org
          Reporter: nate at kde.org
                CC: unassigned-bugs at kde.org
  Target Milestone: ---

With Libinput, there's no longer any concept of "scroll by n lines" the way
there was with evdev. Instead Libinput leaves it up to the DE to take the
Libinput-provided scroll angle/delta information and scale that appropriately
before passing it to the UI toolkit for toolkit-specific scroll handling.

We should support this, since the lack of a "scroll by n lines" feature is a
regression compared to the evdev Mouse KCM.

For more information, see
https://gitlab.freedesktop.org/libinput/libinput/issues/185

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