windowitem: properly handle sub-subsurfaces
The damage of the whole subsurface tree needs to be considered, not just the topmost subsurfaces of a window. BUG: 466747 (cherry picked from commit 43a9add5)
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The damage of the whole subsurface tree needs to be considered, not just the topmost subsurfaces of a window. BUG: 466747 (cherry picked from commit 43a9add5)