[okular] [Bug 421822] New: 'Scroll Page Up'/'Scroll Page Down' actions do not scroll by pages

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https://bugs.kde.org/show_bug.cgi?id=421822

            Bug ID: 421822
           Summary: 'Scroll Page Up'/'Scroll Page Down' actions do not
                    scroll by pages
           Product: okular
           Version: unspecified
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: quantera at gmail.com
  Target Milestone: ---

Created attachment 128636
  --> https://bugs.kde.org/attachment.cgi?id=128636&action=edit
Demonstration of a problem

SUMMARY

After upgrade to okular 20.0.4, keyboard shortcuts bound to 'Scroll Page
Up'/'Scroll Page Down' actions do not scroll by screenfulls, like they should,
but instead behave similarly to 'Arrow Up'/'Arrow Down' keys.
Those shortcuts work properly in versions 19.12.3 or below

STEPS TO REPRODUCE

Open any pdf document and try to scroll down by using either PgDown or Space
keys (which are bound to 'Scroll Page Down' by default)

OBSERVED RESULT

The document is scrolled by small increments

EXPECTED RESULT

The document should scroll by screenfulls

SOFTWARE/OS VERSIONS

Linux: Linux arch 5.6.11-arch1-1 x86_64 GNU/Linux
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION

Attached is a screencast which demonstrates the problem. In this video, after a
short initial pause I press PgDown (or Space) button 10 times, then after some
pause I press PgDown and leave it pressed for a few seconds.

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