D16066: [ksmserver] Launch logout greeter with DBus methods

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  Removing this is part of preparations for ksmserver to become just an X
  session manager. See T9779 <https://phabricator.kde.org/T9779>.
  
  Instead of ksmserver opening the greeter with a tonne of args and then
  having a socket to watch for changes, the new mechanism is that we fire
  and forget the prompt. Then the logout prompt calls back into ksmserver
  with the request. Simplifies code greatly allows for moving.
  
  KSMserver's shutdown DBus method remain on ksmserver for compatibility,
  but ultimately spawning the prompt will move to libkworkspace and called
  from the session directly.
  
  QML API in the logout greeter remains mostly untouched.
  
  Behavioural changes are minor:
  There was a QML property "choose" exposed to the greeter if the default
  shutdown option is set to None. Though we don't allow this in the KCM
  and our default prompt doesn't use it.
  
  We no longer block a user from saving a session whilst a logout prompt
  is active.

TEST PLAN
  Logged out
  Shutdown
  
  Also ran with old ksmserver, still got a prompt

REPOSITORY
  R120 Plasma Workspace

BRANCH
  ksmserver_split

REVISION DETAIL
  https://phabricator.kde.org/D16066

AFFECTED FILES
  ksmserver/CMakeLists.txt
  ksmserver/org.kde.LogoutPrompt.xml
  ksmserver/server.cpp
  ksmserver/server.h
  ksmserver/shutdown.cpp
  logout-greeter/CMakeLists.txt
  logout-greeter/greeter.cpp
  logout-greeter/greeter.h
  logout-greeter/main.cpp
  logout-greeter/shutdowndlg.cpp
  logout-greeter/shutdowndlg.h

To: davidedmundson, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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