title: Vim undo: undo changes after file write
body: <p>In my code on vim, I did a lot of changes and then did a <code>ZZ</code> (save and exit). But then I realized I didn't need those changes. Is there a way I can get back to the state before doing those changes using from some buffer where that data still might be stored. I haven't made any changes after the save &amp; exit.</p>