GNU bug report logs - #63622
lisp/progmodes/python.el: performance regression introduced by multiline font-lock

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Message #26 received at 63622 <at> debbugs.gnu.org (full text, mbox):

From: kobarity <kobarity <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Tom Gillespie <tgbugs <at> gmail.com>, Eli Zaretskii <eliz <at> gnu.org>,
 63622 <at> debbugs.gnu.org
Subject: Re: bug#63622: lisp/progmodes/python.el: performance regression
 introduced by multiline font-lock
Date: Mon, 22 May 2023 23:58:37 +0900

[Message part 1 (text/plain, inline)]

Stefan Monnier wrote:
> FWIW, I recommend against using
> `font-lock-extend-after-change-region-function`.
> 
> You can use `font-lock-extend-region-functions` instead (which performs
> the region-extension right before fontifying a chunk) to avoid this problem.
> [ It won't help with the current performance issue, tho.  ]

Thank you for your advice.  Does the attached patch seem reasonable?

[0001-Use-font-lock-extend-region-functions-in-python-mode.patch (application/octet-stream, attachment)]

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