[okular] [Bug 427504] Jittery scrolling behavior with a free-scrolling mouse

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=427504

Nate Graham <nate at kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
            Summary|inconsistent scrolling      |Jittery scrolling behavior
                   |behavior with a             |with a free-scrolling mouse
                   |free-scrolling mouse        |
             Status|REPORTED                    |CONFIRMED
           Keywords|                            |regression
                 CC|                            |nate at kde.org

--- Comment #2 from Nate Graham <nate at kde.org> ---
I suspect that this introduced with
https://invent.kde.org/graphics/okular/-/commit/c54c38f761fb79efd0d552bdb88c7977f22b3a88.

> The scrolling also is slow to start and takes a few seconds to pick up speed,
> like it is using inertial scrolling.

Yes, that's intentional. We turned back on animated smooth scrolling for mouse
wheels in Okular 1.11.2 after fixing the outstanding regressions with it. I
guess we regressed it for you, sorry. :(

In the upcoming Okular 1.12 AKA 20.12, yo'll be able to disable smooth
scrolling, which should fix this for you.

In the meantime, I wonder if there's any way to detect free-scrolling mice and
handle the scroll input as though it was a touchpad, or turn off smooth
scrolling for that case Or maybe there's a bug in how the animations are
handled or something. These mise are probably sending hundreds of scroll events
per second.

I don't have relevant hardware to test, sadly. Just a touchpad, touchscreen,
and regular clicky mouse wheel mouse.

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