touchpad scrolling: Okular suddenly jumps several lines downwards or upwards

Bug #1808053 reported by Yang Yang
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
okular (Ubuntu)
New
Undecided
Unassigned

Bug Description

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!

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