[Okular-devel] [okular] [Bug 341945] New: Wrong rendering with scrolling in PDF

[Nicolas Pavillon]

https://bugs.kde.org/show_bug.cgi?id=341945

            Bug ID: 341945
           Summary: Wrong rendering with scrolling in PDF
           Product: okular
           Version: 0.19.3
          Platform: MacPorts Packages
                OS: OS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: nicos at macports.org

When scrolling down in a pdf document, streaks appear in the document, as if
the page was not refreshed properly. 

The issue was originally reported in https://trac.macports.org/ticket/45910,
where a screen capture of the issue is also given. 

I noticed that the rendering problem can be corrected by unzooming/zooming,
pointing to a refreshing problem. 

It also seems that the problem specially occurs when using scrolling with the
trackpad, but not with an external mouse.

This was primarily tested with version 0.19.3 (KDE 4.13.3), but the problem is
also present in KDE 4.14.3 according to my tests.

Reproducible: Always

Steps to Reproduce:
1. Open PDF document
2. Scroll down with trackpad


Actual Results:  
Streaks appear in the document


Expected Results:  
The pdf should render properly

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