[okular] [Bug 425376] New: Disconnect between Mousewheel and page control Area of scrolbar

[Frank Storm]

https://bugs.kde.org/show_bug.cgi?id=425376

            Bug ID: 425376
           Summary: Disconnect between Mousewheel and page control Area of
                    scrolbar
           Product: okular
           Version: 1.11.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: Frank.Storm at gmx.net
  Target Milestone: ---

SUMMARY
There is a disconnect between scrolling with the mousewheel and the page-wise
scrolling by clicking at the page control area of the scrollbar. E.g, if
scrolled down a few pages by clicking at the page control area and then using
the mouse wheel, the page jumps back where it was before clicking at the page
control area. If the slider is used, then everything is fine. 

STEPS TO REPRODUCE
1. Move the slider to the top of the document
2. Click below the slider to scroll a few pages down
3. Using the mousewheel now, the document jumps back to the top

OBSERVED RESULT
The mousewheel ignores the current position but uses the position before
scolling down some pages.

EXPECTED RESULT
The mousewheel should continue to scroll from the current position.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: openSUSE Leap 15.2
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
I also compiled the latest version (1.11.70) but the problem is still there.

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