bug#45041: 27.1; Emacs hangs if the cited message contains some specific text

[Lars Ingebrigtsen]

Pratyush Yadav <me@yadavpratyush.com> writes:

> If I open any buffer and run this snippet, it returns nil almost 
> instantly. If I add (gnus-article-mode) after (goto-char (point-min)) it 
> freezes up.

So the following, in Emacs 27.1, with "emacs -Q" hangs?  I'm unable to
reproduce this.

(with-temp-buffer
  (require 'gnus-art)
  (insert ">
___________________________________________________________________________\n")
  (goto-char (point-min))
  (gnus-article-mode)
  (looking-at "^\\(\\([ ]*\\(\\w\\|[_.]\\)+>+\\|[ ]*[>|]\\)+\\)?
*>>>>> +\"\\([^\" ]+\\)\" +=="))


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   bloggy blog: http://lars.ingebrigtsen.no