D17373: Fix heap-use-after-free

zzag created this revision.
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REVISION SUMMARY
  After Scene::Window::updateShadow is called, `this` is a dangling
  pointer. So, we have to capture m_topLevel instead.

TEST PLAN
  It should make CI a little bit happier.

REPOSITORY
  R108 KWin

BRANCH
  fix-heap-use-after-free

REVISION DETAIL
  https://phabricator.kde.org/D17373

AFFECTED FILES
  shadow.cpp

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