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59017ea918
This fixes an issue where the sidebar was scrolling incorrectly when clicking on chapters when a heading nav is currently in view. The problem was that it was storing the scrollTop of the sidebar, but it was not considering that when navigating to another chapter that the heading nav of the previous chapter would disappear. The solution is to keep of an offset instead so that it can make sure that the vertical position of the clicked chapter stays in the same relative position when the new page loads. Fixes https://github.com/rust-lang/mdBook/issues/2967