[okular] [Bug 507688] New: Regression: Broken rendering at high zoom levels of particular pdf document

[Jan Rathmann]

https://bugs.kde.org/show_bug.cgi?id=507688

            Bug ID: 507688
           Summary: Regression: Broken rendering at high zoom levels of
                    particular pdf document
    Classification: Applications
           Product: okular
      Version First 25.04.3
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Keywords: regression
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: jan.rathmann at gmx.de
  Target Milestone: ---

SUMMARY
The rendering of a particular pdf file is broken when using higher zoom levels
(> 150%?).

STEPS TO REPRODUCE
1. Open the following pdf file in Okular:
https://www.nvv.de/fileadmin/nvv/data/2._Fahrtinfo/4._Liniennetz/Liniennetz_KasselPlus_Schematisch.pdf 
2. Set Zoom level to 200%, or zoom in by mouse wheel etc.

OBSERVED RESULT
The rendering looks broken when zoomed in, see attached screenshot.

EXPECTED RESULT
The rendering looks fine at all zoom levels.

ADDITIONAL INFORMATION
This seems to be a regression that happened after Okular 24.12.3 release.

I can reproduce it with:
* Kubuntu 25.04 + Backports-PPA, Okular 25.04.3, Poppler 0.6.5, Frameworks
6.14.0, Qt 6.8.3
* Fedora Rawhide live image 20250725, Okular 25.07.80, Poppler 0.6.5,
Frameworks 6.16.0, Qt 6.9.1
* Neon Unstable live image 20250727, Okular 25.11.70, Poppler 0.6.5, Frameworks
6.17.0, Qt 6.9.1
* Neon User live image 20250727, Okular 25.04.3, Popper 0.6.5, Frameworks
6.16.0, Qt 6.9.1

I could _not_ reproduce it with:
* Kubuntu 25.04 live image, Okular 24.12.3, Poppler 0.6.5, Frameworks 6.12.0,
Qt 6.8.3
* Fedora 42 live image, Okular 24.12.3, Poppler 0.6.5, Frameworks 6.12.0, Qt
6.8.2

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