[okular] [Bug 461873] New: files always open in new windows instead of tabs in the same window

[abubakar yagob]

https://bugs.kde.org/show_bug.cgi?id=461873

            Bug ID: 461873
           Summary: files always open in new windows instead of tabs in
                    the same window
    Classification: Applications
           Product: okular
           Version: 22.08.3
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: abubakaryagob at gmail.com
  Target Milestone: ---

SUMMARY
***
when opening files from dolphin or command line, opening another file lunches
another window instead of opening in another tab on the same window despite the
open new files in tabs option being enabled.

selecting multiple files and opening them or passing multiple files on the
command line does open the files in tabs under the same window.
***


STEPS TO REPRODUCE
1. open pdf file from dolphin or terminal.
2. open another pdf file from dolphin or terminal.

OBSERVED RESULT
each opened file launches a new okular window.

EXPECTED RESULT
all files will be on the same window under different tabs.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS
(available in About System)
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7

ADDITIONAL INFORMATION
I checked all okular related .desktop files in /usr/share/applications and none
has the `--unique` argument passed so that's not the issue (that was the case
on https://bugs.kde.org/show_bug.cgi?id=428923).
this issue (https://bugs.kde.org/show_bug.cgi?id=436774) seems to be the same
but on windows.

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