[okular] [Bug 427504] New: inconsistent scrolling behavior with a free-scrolling mouse

[roger truong]

https://bugs.kde.org/show_bug.cgi?id=427504

            Bug ID: 427504
           Summary: inconsistent scrolling behavior with a free-scrolling
                    mouse
           Product: okular
           Version: 1.11.2
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: dragonrmartin at gmail.com
  Target Milestone: ---

Created attachment 132248
  --> https://bugs.kde.org/attachment.cgi?id=132248&action=edit
jittery scrolling with v1.11.2

SUMMARY
When using a free-scrolling mouse (Logitech G502), there is a regression in
scrolling behaviors. It is jittery and jumps to the next section rather than
moving smoothly. The scrolling also is slow to start and takes a few seconds to
pick up speed, like it is using inertial scrolling.

STEPS TO REPRODUCE
1. Update to Okular 1.11.2
2. Open a long PDF
3. scroll with a free-scroll mouse

OBSERVED RESULT
jittery scrolling (see the video)

EXPECTED RESULT
scrolling should be smooth as in previous version 1.11.1

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION
Doing a git bisect narrowed down the bad commit to
https://github.com/KDE/okular/commit/a5be0149ec627fbc086e5b26cbbe7be13cde49b8

This issue is currently fixed in master with commit
https://github.com/KDE/okular/commit/d78e2ff9e719d2e14abd11083d3a7466f5ea2736

However, it is present as of the latest release.

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