> I use "occur" on big (> 100 MB) text-files quite often. While doing the
> very nice filtering, emacs regularly, but not always, output a message
> about the undo-information that prompts me to give it a yes or no
> aswear. I cannot exactly remember the wording, but yes means "yes, go
> along and drop the ability to undo the changes in the *occur* buffer".
>
> Could this kind of behaviour be avoided? I can see no occasion when I
> would like to undo in an *occur*-buffer.
Emacs turns off undo data generation while computing the *occur* buffer:
(defun occur-engine (regexp buffers out-buf nlines case-fold-search
title-face prefix-face match-face keep-props)
(with-current-buffer out-buf
(let ((globalcount 0)
;; Don't generate undo entries for creation of the initial
contents.
(buffer-undo-list t)
(coding nil))
...
So why does it build up a lot of undo records?
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