https://bugs.kde.org/show_bug.cgi?id=442503

            Bug ID: 442503
           Summary: Scroll Page Up teleports to top of previous page
           Product: okular
           Version: 21.08.1
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-de...@kde.org
          Reporter: onkekabo...@hotmail.com
  Target Milestone: ---

SUMMARY

In non-continuous scrolling mode, scrolling backwards over a page boundary
(either with scroll wheel, Shift-Space or PgUp) has the effect that the top of
the previous page is shown. In earlier versions the bottom of the previous page
was shown, which is the expected behaviour (so that Scroll Page Down and Scroll
Page Up actions are each others' inverses).


STEPS TO REPRODUCE
1. Open any pdf with more than one page in Single Page, non-continuous view
mode. Size the window so that a vertical scroll bar is showing.
2. Navigate to the top of page 2 (e.g. by pressing the space bar twice)
3. Scroll up (e.g. by pressing Shift-Space or PgUp, or by mouse wheeling up)

OBSERVED RESULT

Okular displays the topmost part of page 1

EXPECTED RESULT

Okular displays the bottommost part of page 1

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
Kernel Version: 5.14.4
OS Type: 64-bit
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-7700 CPU @ 3.60GHz
Memory: 31.2 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1070/PCIe/SSE2


ADDITIONAL INFORMATION

This bug is not present in version 20.12.3, while it appears in 21.08.0 and
21.08.1.

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