D24878: check pending release when mapping

[Siyuan Cao]

scao created this revision.
scao added a reviewer: KWin.
scao added a project: KWin.
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scao requested review of this revision.

REVISION SUMMARY
  when unmap notify is followed by a map, the old Unmanaged will get released and never be managed again. by checking if there is a pending release operation, we can safely re-manage the window again.
  
  related bug: https://bugs.kde.org/show_bug.cgi?id=413350

REPOSITORY
  R108 KWin

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

AFFECTED FILES
  events.cpp
  unmanaged.cpp
  unmanaged.h

To: scao, #kwin
Cc: kwin, scao, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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