Re: undo: changes outside of visible portion of buffer

[Eli Zaretskii]

> From: Eric Abrahamsen <eric@ericabrahamsen.net>
> Date: Sat, 19 Apr 2014 16:07:26 +0800
> 
> I'm trying to undo a fairly large chunk of text deletion, and emacs is
> telling me:
> 
> undo-more: Changes to be undone are outside visible portion of buffer
> 
> I get this no matter where I scroll in the buffer -- it's only about
> three screenfuls. I had undo-tree-mode active when I did the deletion,
> but I get the same error whether it's active or no.
> 
> I'd like this text back, and I don't care if it's not visible! I can't
> find any switches that might allow me to circumvent the error -- what
> options do I have here?

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".