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

[Lars Ingebrigtsen]

Pratyush Yadav <me@yadavpratyush.com> writes:

> FWIW, I am using Doom Emacs [0]. Could it have anything to do with this? 
> I don't think they touch Gnus all that much but maybe some other plugin 
> or setting is causing a side effect.

I don't think Doom should be influencing this, because the test case
seems straight-forward -- you said that just that looking-at, in itself,
was hanging?  That is, does eval-in the following hang for you?

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

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