[okular] [Bug 431848] New: Broken "backend selection dialog"

[Jack]

https://bugs.kde.org/show_bug.cgi?id=431848

            Bug ID: 431848
           Summary: Broken "backend selection dialog"
           Product: okular
           Version: 20.12.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: jack6566 at mailna.me
  Target Milestone: ---

SUMMARY
Option --> General --> Program Features --> [tick box] "Show backend selection
dialog" is borken. Despite having muPDF-GL installed (for instantenous
rendreing
of pdfs, as opposed to slow Okular) while opening a PDF, Okular doesn't asks me
which backend for rendering I would like to chose. Nothing happens. The setting
for a backend chosing doesn't work at all.

STEPS TO REPRODUCE
0. Install better/faster backend (e.g. muPDF-GL)
1. Tick the box "show backend selection dialog"
2. Open a PDF
3. Nothing happens, no dialog to chose better renderer.


Linux/KDE Plasma: Arch
(available in About System)
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.12.2

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