D16103: [effects/fadedesktop] Properly check whether given window is on a particular virtual desktop

zzag created this revision.
zzag added a reviewer: KWin.
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REVISION SUMMARY
  In order to check whether a window is on some particular virtual
  desktop, one has to use isOnDesktop.
  
  Also, this change adds implicit support for the new virtual desktop protocol.

TEST PLAN
  Switched between virtual desktops with a Konsole window being on all
  desktops.

REPOSITORY
  R108 KWin

BRANCH
  effects-fadedesktop-dont-animate-moving-windows

REVISION DETAIL
  https://phabricator.kde.org/D16103

AFFECTED FILES
  effects/fadedesktop/package/contents/code/main.js
  libkwineffects/kwineffects.h

To: zzag, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart