[okular] [Bug 452260] New: Okular opens too many X clients So I cannot start any other applications

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=452260

            Bug ID: 452260
           Summary: Okular opens too many X clients So I cannot start any
                    other applications
           Product: okular
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: qcd at gmx.net
  Target Milestone: ---

SUMMARY
***
Okular opens too many X clients So I cannot start any other applications
***


STEPS TO REPRODUCE
1. open some document in okular, maybe using latexmk and work with it for a
while
2. start hit any GUI program like xterm on a terminal window opened earlier.
3. You will see an error like
Maximum number of clients reachedxterm: Xt error: Can't open display: :0.0


OBSERVED RESULT
Maximum number of clients reachedxterm: Xt error: Can't open display: :0.0
Started GUI program crashes

EXPECTED RESULT
Started GUI program starts

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.4 LTS
Release:        20.04
Codename:       focal

KDE Plasma Version: / (using xfce and i3)
KDE Frameworks Version: /
Qt Version: 
$ qtdiag
Qt 5.9.7 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC
7.3.0) on "xcb" 
OS: Ubuntu 20.04.4 LTS [linux version 5.4.0-105-generic]

Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 RTM HLE


ADDITIONAL INFORMATION

$ lsof -U | grep okular | wc -l
442

lsof -U +c 15 | cut -f1 -d' ' | sort | uniq -c | sort -rn | head -3
    442 okular
    310 dbus-daemon
    136 mattermost-desk

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