D24878: check pending release when mapping

[Siyuan Cao]

scao added a comment.


  I have write a simple qt demo with only one override-redirected window, and clicking the button will produce the effect.
  
  F7655916: test_unmap.tar <https://phabricator.kde.org/F7655916>

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D24878

To: scao, #kwin
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