Re: undo: changes outside of visible portion of buffer

[Eli Zaretskii]

> From: Eric Abrahamsen <eric@ericabrahamsen.net>
> Date: Sat, 19 Apr 2014 16:56:39 +0800
> 
> > I think "visible" here means the narrowed region, not visible on
> > display.  Do you have any kind of narrowing in that buffer?  If so,
> > try "M-x widen RET".
> 
> After I sent the message I had the same idea, and tried "widen", but it
> didn't do anything. It was an emacs-lisp buffer, other minor modes in
> effect were Magit auto revert, Paredit, ElDoc, Auto Complete, and Undo
> Tree. I don't ever use narrowing manually, and I don't think any of
> those minor modes would have done it automatically, so I don't know what
> was going on. I think you must be right, though, that the error was
> referring to narrowing.

Maybe you should look into those modes and see if they don't impose
narrowing behind your back.