bug#44856: 27.1; huge CPU-load (almost-freezing) due to message--syntax-propertize in mu4e

[Lars Ingebrigtsen]

"Dr. Arne Babenhauserheide" <arne_bab@web.de> writes:

> After evaluating (defun message--syntax-propertize (beg end) nil) the
> freezing is gone, so I assume that this is the culprit. I do not know
> exactly what in message--syntax-propertize causes this high load.
>
> This is the code I see for message--syntax-propertize in message.el.gz:
>
> (defun message--syntax-propertize (beg end)
>   "Syntax-propertize certain message text specially."
>   (let ((citation-regexp (concat "^" message-cite-prefix-regexp ".*$"))
>         (smiley-regexp (regexp-opt message-smileys)))

This problem (with extremely slow font-locking with some contents)
should now be fixed in Emacs 28.

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