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Comment by mitjak | Hacker News Reader

I don't have much to add to the thread except for:

    set undofile

which will allow for persistent undo, i.e. undoing changes even after closing a file.

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I also "set undodir=/tmp" so that it doesn't litter my working directory with persistent undo files.

I prefer a variant of that. You can specify more than one place (that is, first choice, second choice, etc.) with a comma-separated list. I do this:

    " Vim 7.3, now with persistent undo
    set undofile
    set undodir=$HOME/.vim_undo,/tmp

That way, if I've remembered to create a .vim_undo folder, they go there (best option). Otherwise, /tmp. (You can do the same thing when specifying places for swap and backup files.)

As the comment suggests, the undo feature is only 7.3 or better.

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