Public bug reported:

I am running ubuntu 18.04 and the okular version is 1.4.3

When I try to use touchpad to scroll, okular can work well at most of
time but sometimes it randomly jumps several lines (in most cases, it
jumps half page). If I am scrolling upwards, it jumps upwards. Or it
jumps downwards if I initially scrolling downwards.

I find that the old verion okular in ubuntu 16.04 is free of this bug.

I also find it has been reported and in the first link below, you can
see the bug demo video.

https://bugs.kde.org/show_bug.cgi?id=389947

https://bugreports.qt.io/browse/QTBUG-49294

https://bugreports.qt.io/browse/QTBUG-40829?jql=text%20~%20%22scroll%20touchpad%22

This bug seems due to a qt bug and will take time to be solved
completely. Does anyone know how to avoid its influence currently since
it is really annoy. I tried to downgrade my current okular to old verion
but it seems that I can not do that in ubuntu 18.04 and I have to go
with the 1.4.3 version.

If anyone knows how to solve it, please tell me. Really appreciated!

** Affects: okular (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1808053

Title:
  touchpad scrolling: Okular suddenly jumps several lines downwards or
  upwards

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