Set/clear autosave based on cookie. #2
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A more likely use case than a user accidentally closing a window and losing work is that we have a server error after the form has already been submitted. At the point the server error comes through, the autosave will already have been erased.
This change introduced a cookie that is set on the client side via javascript and then modified upon successful save. If the save succeeds, the autosave and the cookie are erased.