D24864: [effects] Add effect to hold the desktop window static after plasmashell quitsWhen a plasma session quits, the order of plasmashell and clients quittingis undetermined. This looks bad as our desktop background disappears quite early.Rather...

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REVISION SUMMARY
  ...than changing the real order, we can have kwin reference the 
  last pixmap of any desktop and hold on to it.
  
  Lasting till the compositor quits means it stays on the X frontbuffer 
  till X quits and the experience is seamless.

TEST PLAN
  Logged out (with relevant other ksmserver patches)

REPOSITORY
  R108 KWin

BRANCH
  kwin_set_state

REVISION DETAIL
  https://phabricator.kde.org/D24864

AFFECTED FILES
  autotests/mock_effectshandler.h
  effects.cpp
  effects.h
  effects/CMakeLists.txt
  effects/sessionquit/package/contents/code/main.js
  effects/sessionquit/package/metadata.desktop
  libkwineffects/kwineffects.cpp
  libkwineffects/kwineffects.h
  libkwineffects/kwinglobals.h
  scripting/scriptedeffect.cpp
  scripting/scriptedeffect.h

To: davidedmundson, #kwin
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