D9195: fix wallpaper config and logout screen

[Marco Martin]

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

REVISION SUMMARY
  in the wallpaper config dialog
  there was custom code duplicating listing of kpackage, just wrong
  (if the same wallpaper was installed in more than one place, the
  config file qml was taken from the one with least priority)
  
  port the shutdown dialog to package::fileUrl

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9195

AFFECTED FILES
  ksmserver/logout-greeter/main.cpp
  ksmserver/shutdowndlg.cpp
  ksmserver/shutdowndlg.h
  shell/containmentconfigview.cpp

To: mart
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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