D28145: [wayland] Recursively destroy WindowPixmap objects

zzag added a comment.


  @davidedmundson Would it be okay if I push this patch to Plasma/5.18? My original intent was to fix https://bugzilla.mozilla.org/show_bug.cgi?id=1593478

REPOSITORY
  R108 KWin

BRANCH
  destroy-child-window-pixmap-recursively

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

To: zzag, #kwin, davidedmundson
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