GNU bug report logs - #1501
Emacs 22 loses undo buffer

Previous Next

Full log

Message #44 received at 1501 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Emerick Rogul" <emerick <at> gmail.com>
To: "Chong Yidong" <cyd <at> stupidchicken.com>
Cc: 1501 <at> debbugs.gnu.org
Subject: Re: Emacs 22 loses undo buffer
Date: Sun, 7 Dec 2008 07:36:01 -0500

No, I didn't enable any other major or minor modes before testing.  I
also ran emacs with -q --no-site-file.

Your theory about it being related to font-lock-mode appears to be
correct, however!  I started emacs, loaded the header file, disabled
font-lock-mode, and ran my test again and it behaved as expected
(i.e., it retained all of my undo records).  Is font-lock-mode using
up more records (or more record space) than expected?  I wonder if
it's also Windows-specific in some way?

On Sun, Dec 7, 2008 at 12:48 AM, Chong Yidong <cyd <at> stupidchicken.com> wrote:
> Actually, I went back and tried again.  Using the file you supplied, I
> had to do C-/ about 100 times before Emacs reached its undo-limit.  That
> implies 200 bytes per undo limit, which is about right.
>
> So there does seem to be something strange about the behavior you're
> seeing, where Emacs keeps only 20 or so undo records.
>
> Did you enable any other major or minor modes before testing this?
>
> Also, does turning font-lock-mode off change anything?
>

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.