The 'add' field gets a hidden GUID which, on preview, is used to upsert a row recording the most recent "preview" for each such session. When you post, the new node_id gets recorded in the preview row. Posting when a node_id is already in the preview row either updates the linked node or perhaps offers to.
Preview rows from a week ago get purged. One day users can reclaim unposted previews.
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Re^4: RFC: Edit your posts in a separate page, rather than at the top of a thread. (cached previews)
by Anonymous Monk on Mar 10, 2016 at 01:28 UTC