[okular] [Bug 420492] 20.04.0 significantly slows down mouse scrolling with a "hyperscroll" mouse or a touchpad driver that sends mouse wheel scroll events when configured for greater speed

[David Hurka]

https://bugs.kde.org/show_bug.cgi?id=420492

--- Comment #12 from David Hurka <david.hurka at mailbox.org> ---
@Albert, Kezik:
I think that both your views don’t are ultimately right. It’s not that
something clearly broke, neither is it that nothing broke.

When Kezik implemented the smooth scroll feature, the funktional feature set of
Okular didn’t change. It just looks a bit better now. Let us say, scrolling has
 more “wow” now.

Now it turns out that Okular performs worse at fast scrolling. Again, the
functional feature set of Okular didn’t change. It is just a bit slower now.
Let us say, fast scrolling has less “wow” now.

So I think that no one strictly needs to fix this now. I also don’t think that
we shouldn’t do anything now. I think we should evaluate the improvements and
regressions, and how we could fix the regressions, and whether it is worth the
work.

I suggest to look at QScroller, to investigate why it doesn’t scroll fast
enough. But I fear that its arithmetics implicate some limit, so it would be
much work to fix it.

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