https://bugs.kde.org/show_bug.cgi?id=436682

            Bug ID: 436682
           Summary: Desktop windows shrink or disappear if an output is
                    unplugged
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Desktop Containment
          Assignee: notm...@gmail.com
          Reporter: vlad.zahorod...@kde.org
                CC: plasma-b...@kde.org
  Target Milestone: 1.0

Created attachment 138186
  --> https://bugs.kde.org/attachment.cgi?id=138186&action=edit
The desktop window on the left monitor was shrinked, and the desktop window on
the right monitor got invisible after unplugging one of my monitors

I have 3 monitors arranged as follows

  DP-3(scale: 1) DP-1(scale: 2) DP-2(scale: 3)

The monitors are listed from left to right, i.e. DP-3 is the leftmost monitor
and DP-2 is the rightmost monitor.

When the DP-2 monitor is unplugged, kscreen will re-arrange monitors as follows

  DP-1(scale: 2) DP-3(scale: 1)

Unfortunately, plasmashell doesn't handle that well. Typically desktop windows
will get shrinked or become invisible. The attached screenshot shows my setup
after DP-2 monitor has been unplugged.

This bug cannot be reproduced if all outputs have the same scale factor or when
using software qtquick renderer.

The compositor doesn't send any configure events that could potentially resize
desktop windows, all my outputs have 1920x1080 resolution.

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