[okular] [Bug 441713] New: Okular "Cannot find latex executable."

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https://bugs.kde.org/show_bug.cgi?id=441713

            Bug ID: 441713
           Summary: Okular "Cannot find latex executable."
           Product: okular
           Version: 21.08.0
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: rms.des.web at gmail.com
  Target Milestone: ---

SUMMARY
Trying to add annotations containing LaTeX in PDF fails with
"Cannot find latex executable."

Okular is installed through Flatpak.
Flatpak's texlive installation was performed with
org.freedesktop.Sdk.Extension.texlive.
Host system (Linux Mint 20) also has a working latex installation.

STEPS TO REPRODUCE
1. Install Okular and texlive through Flatpak
2. Annotate some pdf with a pop-up note containing latex. for instance
$$\frac{a}{b}$$

OBSERVED RESULT
Latex rendering failed - Okular
Cannot find latex executable.

EXPECTED RESULT
Display of mathematical formula

SOFTWARE/OS VERSIONS
Windows: NA
macOS: NA
Linux/KDE Plasma: Linux 5.4.0-81-generic (Linux Mint 20.1)
(available in About System)
KDE Plasma Version: NA
KDE Frameworks Version: KDE Frameworks 5.85.0
Qt Version: Qt 5.15.3 (built against 5.15.3)

ADDITIONAL INFORMATION
I suppose the problem is related to:
"    QString latexExecutable =
QStandardPaths::findExecutable(QStringLiteral("latex")); "
line 144 latexrenderer.cpp

due to the sandbox, perhaps it cannot find the latex command, even if I give
full access to the system?
flatpak has the org.freedesktop.Sdk.Extension.texlive extension, perhaps it
could be used if it was added as a possible dependency?

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