[Okular-devel] [okular] [Bug 350958] New: okular fails to re-render when zooming into complex pdf files

[Nico Kruber]

https://bugs.kde.org/show_bug.cgi?id=350958

            Bug ID: 350958
           Summary: okular fails to re-render when zooming into complex
                    pdf files
           Product: okular
           Version: 0.21.3
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: nico.kruber at gmail.com

In several more complex and huge page dimension pdf files, okular fails to
re-render contents of the screen if I zoom in or move the shown area when
zoomed in. New (previously invisible) areas stay white; zoomed-in areas have a
bad resolution. Refreshing the view with F5 renders the areas correctly

Reproducible: Always

Steps to Reproduce:
1. open the pdf file (attached in comment 1)
2. zoom in, e.g. with CTRL+mouse wheel, to 400%
3. see that the image does not get rendered with a higher resolution
4. refresh (F5) -> it renders correctly
5. scroll horizontally to the right until a white area is shown and wait
6. this area is not re-freshed until hitting F5 ourselves

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