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PhilGoetz comments on Tool ideology - Less Wrong
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Wait - vim undo is a tree? So I can get back the revisions that I lost by undoing the last 100 operations and then carelessly inserting a character? HOW?
Wow! It is? I had no idea!
From the looks of it this script might be a helpful way to use the feature.
Well, now that you new that it is there, you could just type :help undo-tree. Basically, it is about g+/g-.
And the next chapter of undo.txt tells you about saving undo history.