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From: MAP@LCS.MIT.EDU (Michael A. Patton)
Newsgroups: gnu.emacs.help,comp.emacs
Subject: How to re-do undo's ...
Message-ID: <9010202153.AA29646@gaak.LCS.MIT.EDU>
Date: 20 Oct 90 21:53:41 GMT
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   From: slcpi!dev07123!chan@uunet.uu.net (Milo Chan)
   Date: Thu, 18 Oct 90 10:36:54 EDT

   QUESTION: Is there any way to reverse the direction of the undo without
   going 'all the way back' to the end of the change history first?  

If you type some command other than undo---I tend to use C-A---that
breaks the chain of undos.  Now if you type undo (C-_) again, it
undoes the last change.  In this case the last change is the last undo
from the previous sequence.  In effect this redoes the original change.
Watch out, if you redo several then make some other changes and decide
to use undo to get back to some other intermediate state you may
confuse yourself, I've occasionally done this so much my brain started
hurting :-).