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nvrl
fc2be66b0c
Every write of a document's text keeps the text it replaces, in the same transaction. Autosave writes every few seconds, so an ordinary save keeps one at most every ten minutes; `:w!`, a save over the SFTP mount and a restore always keep one, because each may undo something. A rename alone, or a document that was empty, keeps nothing. `gh` or `:history` lists the open document's earlier versions, the newest first, and shows the highlighted one as a line diff against the text as it is now. Enter brings it back, and what it replaces becomes a version of its own, so a restore is undone the same way. The daily sweep forgets versions older than WORKSPACE_REVISION_DAYS (90) but never the newest 20 of a document, and keeps an upload as long as a version still embeds it. Versions stay out of the export, the mount and the readable mirror; a document in the trash shows none.