D17247: Cleanup virutal desktops in deleted

davidedmundson created this revision.
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REVISION SUMMARY
  virtual desktops can be destroyed, active clients update, but deleted
  keeps a cache.
  
  Someone needs to do cleanup to avoid dangly pointers.

TEST PLAN
  I couldn't find a case of someone calling desktops mid way through an
  animation, so it's only a hypothetical bug.

REPOSITORY
  R108 KWin

BRANCH
  origin-master (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D17247

AFFECTED FILES
  deleted.cpp

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