https://bugs.kde.org/show_bug.cgi?id=493427

            Bug ID: 493427
           Summary: Inconsistent behavior and crash when trying to reorder
                    windows in application group in icon-only task manager
    Classification: Plasma
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Task Manager and Icons-Only Task Manager
          Assignee: plasma-b...@kde.org
          Reporter: a...@ariasuni.eu
                CC: qydwhotm...@gmail.com
  Target Milestone: 1.0

Created attachment 173930
  --> https://bugs.kde.org/attachment.cgi?id=173930&action=edit
`coredumpctl info` of the latest plasmashell crash

SUMMARY
I have an icon-only task manager set to group by program name. If I have more
than one window of a program open at a time and that I try to reorder them,
first it works very badly (the window isn’t dragged at the correct place, or
isn’t moved at all), and secondly it tends to crash plasmashell under obscure
conditions but guaranteed to happen after trying a few reorders (< 10) or when
closing the window list afterwards.

Since I tend to like to have my two or three Firefox windows in the same order
and that Plasma doesn’t remember them, I try to reorder them everyday before
starting to use my computer and very frequently hit this bug.

STEPS TO REPRODUCE
1. Set up a panel with an icon-only task manager
2. Open several windows of the same application
3. Click on the application icon in the task manager, and try to reorder the
windows until it crashes

OBSERVED RESULT
Reordering of windows behaves weirdly, doesn’t work every time and often crash
Plasma.

EXPECTED RESULT
Reordering of windows behaves correctly, consistently and doesn’t crash Plasma.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Graphics Platform: Wayland

ADDITIONAL INFORMATION
I don’t remember when it started but it started somewhere around the beginning
of Plasma 6 or when I switched to Wayland.

I have coredumps but they’re too large to upload here (~20M).

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