[okular] [Bug 377128] New: Zooming with ctrl+scrolling too fast

[Stephan Burkhardt]

https://bugs.kde.org/show_bug.cgi?id=377128

            Bug ID: 377128
           Summary: Zooming with ctrl+scrolling too fast
           Product: okular
           Version: 1.0.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: oceanofsolaris at gmx.net
  Target Milestone: ---

When I zoom using ctrl+scrolling (using a touchpad or a thinkpad pointing
stick), okular zooms out or in way too fast.

Reproduce:
Open a document at 100% zoom, hold ctrl and scroll half a fingers width on your
touchpad
Result:
Okular zooms out to 12% zoom (smallest level)
Expected:
Zoom out one step (to e.g. 90 %).

The same happens when zooming in (get to 1600% zoom while barely moving my
fingers). This makes zooming using ctrl+scroll impossible since I always
overshoot my desired zoom level by large margins.

This is on Arch Linux with KDE 5.9.3 and okular 1.0.2, the touchpad being
handled by libinput 1.6.2. The fault might also lie with the way libinput
generates scroll events.

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