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04f10fbf64
The root cause of the crash was threefold: - you can't enumerate enums, in dart; you have to enumerate their values. - RenderNodeWrapper was trying to call remove(child.root) on its root, but that's not something that all RenderNodes have - when a RenderNode was deparented, its relayoutSubtreeRoot wasn't removed, so the node ended up in an inconsistent state regarding its parent tree R=abarth@chromium.org Review URL: https://codereview.chromium.org/1151573020