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> but you're also not storing your data in a place the developers of the OS expected you to put important data.

So exactly the opposite of persistent undo?

The short-termism changes little here, losing weeks' worth of work just because you deleted it recently by mistake and then upgraded with the app deleting the undo, is also bad

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That's the point, though, undo (in most applications) is a fragile place to hold much work, regardless of whether it normally survives restarting the app. You could argue about whether it should be that way (infinite, robust, persistent undo is a nice safety net in general), but I would not assume that is the case unless it's very well documented otherwise (and the UI is adjusted accordingly: you really need an undo tree, else a large series of undos followed by an accidental edit will also wipe out a lot of data), and neovim's documentation does not say that it is intended to work that way.

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