[okular] [Bug 408195] New: unrendered pdf regions with trim margins and facing pages on 4k screen

[Kevin]

https://bugs.kde.org/show_bug.cgi?id=408195

            Bug ID: 408195
           Summary: unrendered pdf regions with trim margins and facing
                    pages on 4k screen
           Product: okular
           Version: 1.7.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: kjslag at gmail.com
  Target Milestone: ---

Created attachment 120489
  --> https://bugs.kde.org/attachment.cgi?id=120489&action=edit
screenshot

SUMMARY
When I view certain pdfs with okular using the trim margin and facing pages
feature, some regions of the pdf don't render and just appear white. See
attached screenshot of this pdf:
https://docs.kde.org/trunk5/en/applications/fundamentals/fundamentals.pdf
This seems to only occur when the okular window is at least ~3000 pixels wide;
eg, a fullscreen okular window has this issue on my 4k screen.

STEPS TO REPRODUCE
1. Open
https://docs.kde.org/trunk5/en/applications/fundamentals/fundamentals.pdf
2. Make okular window at least ~3000 pixels wide.
3. Enable trim margin
4. Use facing pages

OBSERVED RESULT
Large unrendered region, as seen in screenshot.

EXPECTED RESULT
Everything should be rendered.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.1.5
(available in About System)
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.58
Qt Version: 5.12.3

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