[okular] [Bug 427953] New: Unique instance and open in tabs ignored

[okbug]

https://bugs.kde.org/show_bug.cgi?id=427953

            Bug ID: 427953
           Summary: Unique instance and open in tabs ignored
           Product: okular
           Version: 1.11.1
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: okularbugreport at mailinator.com
  Target Milestone: ---

SUMMARY


STEPS TO REPRODUCE
1. Set "Open new files in tabs" in Settings
2. Add a registry "Parameter" key in
[HKEY_CLASSES_ROOT\AppXhptkdxysnj90q56w5z3sx7d7a55gse06\Shell\open] with value
'--unique "%1"'

OBSERVED RESULT

Each new file gets opened in a new window (with a new process).
Passing the --unique argument show a dialog every time saying something like
'Another unique instance is running, this won't be the unique instance...'
although there are no Okular processes running on the system.


EXPECTED RESULT

Open all (PDF) files in tabs of a single program instance.

SOFTWARE/OS VERSIONS
Windows: 10 build 2004
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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