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When toggling `display: none` on an element, it can go from having a layout subtree to not having one. In the `none` case, we were previously leaving stale layout nodes hanging off DOM nodes in the subtree. These layout nodes could be queried for outdated information and probably other things that we shouldn't allow. Fix this by having TreeBuilder prune any old layout nodes hanging off nodes in a subtree after its subtree root doesn't produce a layout node.
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2 lines
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