7/24    Help.  I have an emacs session in which I made many edits without
        saving.  I played with undo and it goes on and on.  Now I want to
        return to the state before any undo and emacs does not seem to have
        a redo.  How can I undo the undo without reverting to the last
        autosave?  I haven't yet made any changes after the undo.   Thanks.
        \_ Move the cursor, then hit undo.