D5157: Add support for emergency message show on Wayland

[Martin Gräßlin]

graesslin created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  When playing with the lockscreen I noticed that the emergency show does
  not work on Wayland and one only gets a black screen if the system fails.
  
  This change adds a property to the QWindow (in ksld), so that KWin can
  read this and now that this is a window to be shown on the lock screen.
  In addition the geometry of the background window gets adjusted correctly
  on Wayland.
  
  The change needs a small part also in KWin.

REPOSITORY
  R133 KScreenLocker

BRANCH
  emergency-show-wayland

REVISION DETAIL
  https://phabricator.kde.org/D5157

AFFECTED FILES
  abstractlocker.cpp
  waylandlocker.cpp
  waylandlocker.h

To: graesslin, #kwin, #plasma
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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