[okular] [Bug 389947] touchpad scrolling: Okular jumps several lines down first when scrolling after the cursor moves out and back again

[tty]

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

tty <uk0052003 at gmail.com> changed:

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                 CC|                            |uk0052003 at gmail.com

--- Comment #5 from tty <uk0052003 at gmail.com> ---
I have be influenced by this bug too.

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 version okular in ubuntu 16.04 is free of this bug.

This bug seems to 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 version 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!

I have reported it via ubuntu's launchpad website.

https://bugs.launchpad.net/ubuntu/+source/okular/+bug/1808053

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