[okular] [Bug 375220] New: mouse wheel scrolling broken after update to 16.12

[Jiri Slaby]

https://bugs.kde.org/show_bug.cgi?id=375220

Bug ID: 375220
Summary: mouse wheel scrolling broken after update to 16.12
Product: okular
Version: unspecified
Platform: openSUSE RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: okular-***@kde.org
Reporter: ***@gmail.com
Target Milestone: ---

After recent update, perhaps to okular 16.12 (it may be 16.04 or 16.08, only I
haven't noticed yet), scrolling by mouse wheel is broken. I very suspect this
to be a genuine Qt5 bug.

What I do:
* click somewhere in the PDF document
* scroll down by wheel
* click somewhere in the PDF document again
* scroll down by wheel again

What happens is that the second scroll starts exactly where the first started.
So it actually jumps to the position as if the first scroll never happened and
starts scrolling from there on.

I actually need not to click anywhere in the document. It is enough to switch
to another window and continue scrolling in the PDF document -- it always jumps
back.

okular update activity:
2015-10-19
08:56:31|install|okular|15.08.1-1.1|x86_64||repo-oss|dfb3cd4078a7ee603649922dd7e1227ddb01eacd|
2015-10-28
09:38:56|install|okular|15.08.2-1.1|x86_64||repo-oss|677b4ae12073bcb1f148ff088fb3abb927f59950|
2015-11-22
17:44:31|install|okular|15.08.3-1.1|x86_64||repo-oss|841eea27c9382abdc43659103694e0d9ba325c94|
2016-01-27
10:44:25|install|okular|15.12.0-1.2|x86_64||repo-oss|2e13d9db644338fe2ad135506ae8d4b04599d927|
2016-02-11
08:57:06|install|okular|15.12.1-1.1|x86_64||repo-oss|3b3969fc66e4d06539a63991a0ba54676af57947|
2016-03-14
15:02:26|install|okular|15.12.2-1.1|x86_64||repo-oss|3ff3ef063d6f55088a99cff21f0cefb50dad71a0|
2016-04-09
16:41:59|install|okular|15.12.3-1.1|x86_64||repo-oss|1e335bb1ec55cb8c53629898ded236c27eac3663|
2016-05-11
17:49:56|install|okular|15.12.3-1.2|x86_64||repo-oss|d0d2dc86a294337b47794b7d0f71b4602e5bc8d0|
2016-06-08
07:30:59|install|okular|16.04.1-1.1|x86_64||repo-oss|d07dbfe284c2954c17902400cb278d0229fd77f0|
2016-06-27
11:35:19|install|okular|16.04.2-1.2|x86_64||repo-oss|aa7679343a8c0494adbeae8d4aadb060390a6588|
2016-07-25
15:21:05|install|okular|16.04.2-2.1|x86_64||repo-oss|954abaa8ebbf3b7f2d897511cb5e0ab0cb2f7488|
2016-07-29
10:58:37|install|okular|16.04.3-1.1|x86_64||repo-oss|ac9ab429ef5acebc044fdd97dfd2011561d5b25e|
2016-09-07
19:29:29|install|okular|16.08.0-1.2|x86_64||repo-oss|373d93459f554c170b3f8805f1764a6d92132995|
2016-10-05
14:17:36|install|okular|16.08.1-1.1|x86_64||repo-oss|df595a3fd03a27dfaaa4110b1a38f3dabd5b9e76|
2016-11-07
12:20:45|install|okular|16.08.2-1.1|x86_64||repo-oss|1e767632c1d5007ab1d1f3cb5a53818f41d45528|
2016-12-01
21:26:46|install|okular|16.08.3-1.1|x86_64||repo-oss|a5b02bbe269fc86c2c90f816ce44e7f26cdbf982|
2017-01-05
08:28:09|install|okular|16.12.0-1.1|x86_64||repo-oss|7c8083cceb312244c96320ce1f7373da698db0dd|

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=375220

Albert Astals Cid <***@kde.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WAITINGFORINFO
Status|UNCONFIRMED |NEEDSINFO
CC| |***@kde.org

--- Comment #1 from Albert Astals Cid <***@kde.org> ---
Not sure i understand what you mean, could you record a video and upload it
somewhere (youtube, vimeo, etc)?

[Jiri Slaby]

https://bugs.kde.org/show_bug.cgi?id=375220

--- Comment #2 from Jiri Slaby <***@gmail.com> ---
Created attachment 103637
--> https://bugs.kde.org/attachment.cgi?id=103637&action=edit
video demonstration

What I do is I scroll down using wheel and click in other window (necessary to
reproduce). Both actions in a loop.

[Jiri Slaby]

https://bugs.kde.org/show_bug.cgi?id=375220

Jiri Slaby <***@gmail.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
Resolution|WAITINGFORINFO |---
Status|NEEDSINFO |UNCONFIRMED

--- Comment #3 from Jiri Slaby <***@gmail.com> ---
.

[Jiri Slaby]

https://bugs.kde.org/show_bug.cgi?id=375220

--- Comment #4 from Jiri Slaby <***@gmail.com> ---
Hmm, this is not reproducible on a single-monitor setup (when I unplug the
notebook from the docking station). I noticed the bug on a 2-monitor setup.

[Sebastian]

https://bugs.kde.org/show_bug.cgi?id=375220

Sebastian <***@tum.de> changed:

What |Removed |Added
----------------------------------------------------------------------------
Keywords| |investigated, triaged
CC| |***@tum.de
Resolution|--- |WAITINGFORINFO
Status|REPORTED |NEEDSINFO

--- Comment #5 from Sebastian <***@tum.de> ---
Hey Jiri,

I can not reproduce this bug, I am also on two monitors.

If the bug still exists, could you post your setup and version of plasma, kde,
qt and okular in order to get an better overview?

Thanks for your help!

Note: I am no maintainer but from the KDE Bugsquad
Tested with okular 1.3.3 under kubuntu