[kde] [Bug 460831] New: Sometimes apps run under plasma clutter process list indefinitely instead of closing normal way

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https://bugs.kde.org/show_bug.cgi?id=460831

            Bug ID: 460831
           Summary: Sometimes apps run under plasma clutter process list
                    indefinitely instead of closing normal way
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: blood990 at gmail.com
  Target Milestone: ---

Created attachment 153104
  --> https://bugs.kde.org/attachment.cgi?id=153104&action=edit
Video showing expected behavior few times, then bugged behavior on last
spectacle close

I noticed situation that looks like bug, where sometimes GUI apps leave process
without standard way to kill it other than terminating process. Applications
that I caught behaving like that so far regularly: discover, spectacle
It's I swapped to linux full-time few days ago so I do not have much data, but
I managed to get redundant steam and lutris application instances as well while
using PC. I managed to find reliable reproduction for spectacle for now:

STEPS TO REPRODUCE
1. Press print screen button to get result in spectacle
2. Make sure checkbox that closes spectacle after copying to clipboard or
manual save is checked
3. Press "copy to clipboard" button at the bottom of spectacle, so spectacle
window shuts down

OBSERVED RESULT
Spectacle process doesn't end and stays indefinitely in system monitor, any
further attempts to call spectacle window and close it via X button don't
terminate its process. Killing spectacle process manually makes it behave
normally again on closing X button

EXPECTED RESULT
Spectacle is removed from process list on close - it usually happens when
closing spectacle via X button without triggering the bug before

SOFTWARE/OS VERSIONS
Linux: Kubuntu 22.04.1
KDE Plasma Version: 5.24.6
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
May need to tweak some spectacle settings so it behaves like in attached video.
I definitely managed to get discover app stuck in same state somehow so it may
be not spectacle-specific bug

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