Subject: bug#1501: Emacs 22 loses undo buffer

From: Chong Yidong <[email-masked]>
Date: Sun, 07 Dec 2008 00:48:53 -0500

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?