[plasmashell] [Bug 364280] If a window has its content moved below the screen (but not its whole decoration), it disappears from taskbar

[Pierre Ducroquet via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364280

--- Comment #3 from Pierre Ducroquet  ---
I don't have enough time to build and test Plasma 5.7 right now, I'll wait for
the Debian sid packages or try to fix up a test machine with a second screen.
Sorry for the wrong category, I though it was kwin that exposed the list of
windows to the taskbar.

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[kwin] [Bug 364280] New: If a window has its content moved below the screen (but not its whole decoration), it disappears from taskbar

[Pierre Ducroquet via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364280

Bug ID: 364280
   Summary: If a window has its content moved below the screen
(but not its whole decoration), it disappears from
taskbar
   Product: kwin
   Version: 5.6.4
  Platform: Other
OS: Linux
Status: UNCONFIRMED
  Severity: normal
  Priority: NOR
 Component: multihead
  Assignee: kwin-bugs-n...@kde.org
  Reporter: pina...@pinaraf.info

When I hid a gift-shopping window, I moved it to the far bottom of the screen,
and when I searched it back later I had to use alt-tab to find it because it
disappeared from the plasma task bar.
My panels are on top of the screen, thus making this bug possible.

Reproducible: Always

Steps to Reproduce:
1. Move tasks bar to top
2. Move a window below the screen, leaving only a part of its decoration
visible
3. Look at the task bar

Actual Results:  
Window is no more accounted on the right screen

Expected Results:  
Window should be still counted on its screen…

I'm using two screens side by side with nVidia proprietary driver. I can't
reproduce the bug on a single-head system. The xrandr configuration does not
create «invisible» virtual screen space : both screens are 1920x1080 with no
offset.

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