https://bugs.kde.org/show_bug.cgi?id=406203

            Bug ID: 406203
           Summary: Task Manager displays wrong windows on dual-monitor
                    setup after random time.
           Product: plasmashell
           Version: 5.15.4
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Task Manager
          Assignee: h...@kde.org
          Reporter: aaronbotte...@gmail.com
                CC: plasma-b...@kde.org
  Target Milestone: 1.0

SUMMARY


STEPS TO REPRODUCE
1. Use dual monitors, configed to show only current screen and current desktop
windows.

2. Eventually, task manager will match the other monitor. Is random for how
long it takes, usually.

OBSERVED RESULT
Task manager on desktop will show windows for opposite monitor.

EXPECTED RESULT
Task manager only shows windows in that monitor and virtual desktop.

Sometimes, I always notice it when the desktop crashes. Messing with widget and
such often leads to crashes and KDE restarting, but I do believe this is a
different issue as this issue will not always be followed by a plasma crash or
instability, and happens without editing widgets, panels, etc.

Has happened rarely for a few versions, finally got tired of it to submit this
report. This issue is not new to this version, but sadly can't remember when
this started exactly. Also do not believe it to be GPU-driver related, either.
It happened on Mesa 18, also.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.15.4
KDE Frameworks Version: 5.56.0
Qt Version: 5.12.2
Kernel Version: 5.0.4-1-ck
OS Type: 64-bit
Processors: 16 × AMD Ryzen 7 1700 Eight-Core Processor
Memory: 31.4 GiB of RAM

$glxinfo | grep OpenGL
OpenGL vendor string: X.Org                                                     
OpenGL renderer string: Radeon RX 580 Series (POLARIS10, DRM 3.27.0,
5.0.4-1-ck, LLVM 8.0.0)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 19.1.0-devel
(git-d4e0fbc92f)
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 4.5 (Compatibility Profile) Mesa 19.1.0-devel
(git-d4e0fbc92f)
OpenGL shading language version string: 4.50
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 19.1.0-devel
(git-d4e0fbc92f)
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:

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