[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

--- Comment #6 from tty  ---
(In reply to GuHua from comment #3)
> I just did a few more tests, and this seems to be a Qt bug as other Qt
> applications also have this problem (but I didn't observe them because I
> seldem use touchpad on them) while gtk applications (e.g. chromium) don't.
> 
> These bugs may all be about this:
> 
> https://bugreports.qt.io/browse/QTBUG-
> 40829?jql=text%20~%20%22scroll%20touchpad%22
> https://bugreports.qt.io/browse/QTBUG-49294

Did you have a chance to solve this problem? Thanks.

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[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  changed:

   What|Removed |Added

 CC||uk0052...@gmail.com

--- Comment #5 from tty  ---
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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[okular] [Bug 389947] touchpad scrolling: Okular jumps several lines down first when scrolling after the cursor moves out and back again

[Simon Andric]

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

Simon Andric  changed:

   What|Removed |Added

 CC||simonandr...@gmail.com

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

[Michael Weghorn]

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

Michael Weghorn  changed:

   What|Removed |Added

 Status|NEEDSINFO   |RESOLVED
 CC||m.wegh...@posteo.de

--- Comment #4 from Michael Weghorn  ---
Thanks for the update.
Since you mention it's an upstream Qt issue, I'm closing this Okular-specific
bug report.

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

[GuHua]

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

GuHua  changed:

   What|Removed |Added

 Resolution|--- |UPSTREAM
 Status|UNCONFIRMED |NEEDSINFO

--- Comment #3 from GuHua  ---
I just did a few more tests, and this seems to be a Qt bug as other Qt
applications also have this problem (but I didn't observe them because I seldem
use touchpad on them) while gtk applications (e.g. chromium) don't.

These bugs may all be about this:

https://bugreports.qt.io/browse/QTBUG-40829?jql=text%20~%20%22scroll%20touchpad%22
https://bugreports.qt.io/browse/QTBUG-49294

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

[GuHua]

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

--- Comment #2 from GuHua  ---
By the way, the problem has been there for at least months (but I don't
remember the date when I first observe this problem).

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

[GuHua]

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

--- Comment #1 from GuHua  ---
Side notes:

0. Clicking in okular first (after moving out and moving in) does not make any
difference;
1. I'm using two-finger scrolling (and never set or tried "edge scrolling");
2. I never use "native scrolling" ("reversed scrolling");
3. I'm using xf86-input-mtrack (`xf86-input-mtrack-git` package in AUR) as the
touchpad driver (but this doesn't seem to be the reason since the problem is
not presented in other applications).

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