D28067: check for window existence

[Marco Martin]

mart created this revision.
mart added a reviewer: Kirigami.
Herald added a project: Kirigami.
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mart requested review of this revision.

REVISION SUMMARY
  not always after componentcompleted a window is already there.
  if is not there, do the same check whenthe item eventually gets a window

TEST PLAN
  doesn't crash

REPOSITORY
  R169 Kirigami

BRANCH
  phab/nocrash

REVISION DETAIL
  https://phabricator.kde.org/D28067

AFFECTED FILES
  src/shadowedrectangle.cpp
  src/shadowedrectangle.h

To: mart, #kirigami
Cc: plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, ahiemstra, davidedmundson, mart
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