[okular] [Bug 439566] New: Generating printer preview freezes UI and finally claims ghostscript is missing to view it

[postix]

https://bugs.kde.org/show_bug.cgi?id=439566

            Bug ID: 439566
           Summary: Generating printer preview freezes UI and finally
                    claims ghostscript is missing to view it
           Product: okular
           Version: 21.04.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: postix at posteo.eu
  Target Milestone: ---

STEPS TO REPRODUCE
1. Open https://bugs.kde.org/attachment.cgi?id=139894 in Okular
2. File -> Printer Preview

OBSERVED RESULT

Okular uses 100% of one core for several seconds and the UI freezes. Finally it
says ghostscript is missing in order to display the preview.


EXPECTED RESULT

Okular directly says that ghostscript is missing; if it's installed it wouldn't
freeze the UI.


SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20210704
KDE Plasma Version: 5.22.2
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 5.12.13-1-default (64-bit)

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