[okular] [Bug 434595] New: Documents always open in new window

[Julian]

https://bugs.kde.org/show_bug.cgi?id=434595

            Bug ID: 434595
           Summary: Documents always open in new window
           Product: okular
           Version: 20.12.3
          Platform: Snap
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: barg.julian at gmail.com
  Target Milestone: ---

SUMMARY
Thanks for finally rolling out the latest version of Okular to ubuntu/snap.
Unfortunately, right now the options "Open new files in tabs" and "Switch to
existing tab if file is already open" are disregarded. When launching Okular
from the console, the following error message is printed:
```Qt: Session management error: Could not open network socket```
and
```qt.xkb.compose: failed to create compose table```

The --unique flag does not change the result.

STEPS TO REPRODUCE
1. sudo snap install okular
2. okular file.pdf
3. okular otherfile.pdf
4. okular file.pdf

OBSERVED RESULT
Three Okular windows with file.pdf open twice

EXPECTED RESULT
One Okular window with two tabs

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 20.04
(available in About System)
Qt Version: 5.12.8

ADDITIONAL INFORMATION
Before the recent update, tabs used to work (but the "Switch to existing tab if
file is already open" option did not exist).

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