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We put this in `scroll_util` to make it more likely we will eventually unify this with other scrolling logic. (A big piece to move is ui.get_scroll_element, but that's for another PR.) And then the other tactical advantage is that we get 100% line coverage on it. I changed the warning to an error, since I don't think we ever expect scrolling at the `body` level, and I don't bother with the preview node.