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

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

ticket.kde.djr4kjpch5320z5k at rrt.ovh changed:

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--- Comment #20 from ticket.kde.djr4kjpch5320z5k at rrt.ovh ---
(In reply to Nate Graham from comment #0)
> 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.

I tried evdev a while ago and didn't found the feature.

Isn't there a confusion here with the configuration that was present in
kcm_mouse in KDE4 but wasn't belonging to the driver, and was instead a KDE
feature like the double-clicking ?

It's still working : if you add "WheelScrollLines=8" in the "[KDE]" section of
your .config/kdeglobals file, you can see the effect working in konsole and
kate.

The regression here is that contrary to the double-clicking, the configuration
UI has not been migrated to the "General Behavior" page and the feature seems
no more accessible via the GUI.

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