[okular] [Bug 399208] New: Okular has an extemely high latency when scrolling with a wacom tablet

[Keziolio]

https://bugs.kde.org/show_bug.cgi?id=399208

            Bug ID: 399208
           Summary: Okular has an extemely high latency when scrolling
                    with a wacom tablet
           Product: okular
           Version: 1.5.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: keziolio123 at gmail.com
  Target Milestone: ---

SUMMARY
When scrolling with a wacom tablet, the pages move slower than the input,
accumulating up to dozens of seconds of latency, rendering the software
unusable

STEPS TO REPRODUCE
1. Attach a wacom tablet to the pc
2. Open a pdf document in okular
3. Scroll the document with the wacom tablet and notice the sluggishness

OBSERVED RESULT
I made a video
https://youtu.be/BJEZYtXhhMI

EXPECTED RESULT
It should move the page without latency, I can mind low framerate since i'm
with a 4k screen on intel graphics but this is bad
IMPORTANT: It was working fine at the beginning of this year! So the regression
is somewhat recent
I tried with a new user and on another pc and the problem is confirmed

SOFTWARE VERSIONS
KDE Plasma Version: 5.13.5
KDE Frameworks Version: 5.50.0
Qt Version: 5.11.2
I'm using arch linux so it has always been recent and close to upstream

ADDITIONAL INFORMATION
Looking at ksysguard when okular is moving by itself, I see xorg hogging a cpu
core at 100%, okular is using 2% of the cpu, so is kwin_x11
Wayland is not an option on my setup

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