one by one undo the undos

[Dan Jacobson]

We see:
 (C-_, C-x C-u)
              Incremental undo, separately remembered for each line.

Each line? Fancy. I'd trade it for a way to back out once one has
undone too much. Like real emacs, one can do e.g., ^F to break the
undo "habit" and then begin undoing the undos. With bash there is no
way but to continue undoing, continue the destruction. Other approach:
gimp has a redo key.

We see:
       revert-line (M-r)
              Undo all changes made to this line.  This is like executing  the
              undo  command  enough  times  to  return the line to its initial
              state.
Thanks but all I wanted to do was undo one undo...