[okular] [Bug 432121] New: fast scrolling on page number glitches/does not scroll at all

[Bernhard]

https://bugs.kde.org/show_bug.cgi?id=432121

            Bug ID: 432121
           Summary: fast scrolling on page number glitches/does not scroll
                    at all
           Product: okular
           Version: 20.12.1
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: micraft.b at gmail.com
  Target Milestone: ---

SUMMARY
Fast scrolling on the page-number input box causes okular to lose most of the
events/scroll erratically. This is especially bad with mice that support
'infinite scrolling' (removes resistance that stops the wheel after being spun)
I am pretty sure this has worked perfectly fine in the past.

STEPS TO REPRODUCE
1. Open .pdf with many pages
2. Scroll very fast

OBSERVED RESULT
The page number jumps around while okular doesn't actually scroll more than a
couple of pages.
It looks very much like the page number is rapidly reset to the currently
visible page from the slowly scrolling document.

I also tested with a high-res scrolling touchpad on current master and it is
even worse there, often it can't even leave the first page.

EXPECTED RESULT
Okular should not miss/ignore input events and scroll one page per discrete
(ie. not high-resolution) scroll event. For high-res scrolling I don't know
what exactly the solution would be. 

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.20.5 on X11
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2
Kernel Version: 5.10.10-arch1-1

AND

Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.21.80 on Wayland
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-rc5-generic
OS Type: 64-bit
Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics
Memory: 15,1 GiB of RAM
Graphics Processor: AMD RENOIR

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