D28145: [wayland] Recursively destroy WindowPixmap objects

zzag created this revision.
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REVISION SUMMARY
  We need to destroy the root WindowPixmap together with all of its
  children; otherwise, buffers that are attached to subsurfaces will
  not be released.

TEST PLAN
  weston-subsurfaces doesn't quit with an error message saying that
  all buffers are held by the compositor.

REPOSITORY
  R108 KWin

BRANCH
  destroy-child-window-pixmap-recursively

REVISION DETAIL
  https://phabricator.kde.org/D28145

AFFECTED FILES
  scene.cpp

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