[ Reason ]

Fixes #1147212: A race condtion in KWin, that can make Plasma Desktop
crash. It is about, when KWin cycles through the available outputs. The
race can be triggered either by sleep/resume or an usb-c docking station
attach/deattach. If you are affected by it, it recurs reliably in normal
use.

#1147212: session crash in ColorManagementOutputV1 on output change.

[ Impact ]

The user see a crashing Plasma desktop, when they connect and disconnect
monitors and may loose documents.


[ Tests ]

I got feedback from three person that were affected by this bug that the
patch fixes the issue for them.


[ Risks ]

The patches come without modification from upstream, so a larger group
already tested the patches (they fixes the issue kde#504959). The patch
is very narrowed and easy to follow.

https://bugs.kde.org/show_bug.cgi?id=504959

Chris Halls found that the one patch was not enough and added a followup
for their setup, so the second patch was added (a one line patch, that
checks for a null pointer):

https://salsa.debian.org/qt-kde-team/kde/kwin/-/merge_requests/8

[ Checklist ]
  [x] *all* changes are documented in the d/changelog
  [x] I reviewed all changes and I approve them
  [x] attach debdiff against the package in (old)stable
  [x] the issue is verified as fixed in unstable

[ Changes ]
Added two upstream patches unmodified.
e1fd647b: https://invent.kde.org/plasma/kwin/-/commit/e1fd647b
172f8f2e: https://invent.kde.org/plasma/kwin/-/commit/172f8f2e

[ Other info ]

Additionally this pu seems to fixes issue that are reported in #1116619 too.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1147212&pow_referer=#27

#1116619: All opened app crash when disconnecting usb-c docking station
          on a multi-monitor setup