[okular] [Bug 469164] New: Math symbols not being displayed.

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https://bugs.kde.org/show_bug.cgi?id=469164

            Bug ID: 469164
           Summary: Math symbols not being displayed.
    Classification: Applications
           Product: okular
           Version: 23.04.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: ccanonymouss at gmail.com
  Target Milestone: ---

Created attachment 158549
  --> https://bugs.kde.org/attachment.cgi?id=158549&action=edit
A screenshot comparison of the document open in Okular vs Sumatra.

SUMMARY
Mathematical symbols (set theory, lambda, "there exists", etc...) are not being
displayed for PDF files, there is only a tiny blank space on their place.


STEPS TO REPRODUCE
1. I'll use as an example a paper Luca Cardelli provides in his webpage.
Download: http://lucacardelli.name/Papers/OnUnderstanding.A4.pdf
2. Open it with Okular, see how all math symbols are missing...
3. Open it with any other app (e.g., Firefox, Sumatra PDF, ...) and see the
math symbols are there.

OBSERVED RESULT
The math symbols are not being shown.

EXPECTED RESULT
Being able to see the math symbols.

SOFTWARE/OS VERSIONS
Windows: Windows 11 Version 2009 (x86_64)
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9

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