From: Eli Zaretskii <eliz@gnu.org>
To: Dmitry Gutov <dgutov@yandex.ru>
Cc: 57245@debbugs.gnu.org, monnier@iro.umontreal.ca
Subject: bug#57245: 29.0.50; M-> in a large XML file (without long lines) is slow
Date: Wed, 17 Aug 2022 15:20:56 +0300 [thread overview]
Message-ID: <83v8qrcb87.fsf@gnu.org> (raw)
In-Reply-To: <eec6d170-af87-5d8f-18dd-e60a89c574c3@yandex.ru> (message from Dmitry Gutov on Wed, 17 Aug 2022 15:14:07 +0300)
> Date: Wed, 17 Aug 2022 15:14:07 +0300
> Cc: 57245@debbugs.gnu.org, monnier@iro.umontreal.ca
> From: Dmitry Gutov <dgutov@yandex.ru>
>
> >> Which seems to be exactly the behavior the "font-lock narrowing" was
> >> supposed to guard from?
> >
> > No. It wasn't supposed to fix modes that foolishly scan the buffer
> > from BOB to point.
>
> You might want to choose words better.
I did.
> > It was supposed to fix modes which scan from the
> > beginning of line, and that is (a) only a problem when lines are very
> > long, and (b) much harder to solve in the mode itself, because
> > font-lock very frequently uses anchored regexps and otherwise likes to
> > start from BOL, and syntax processing also likes starting from BOL.
>
> syntax-wholelines-max handles that problem.
Only for syntax-related stuff. And we have yet to see whether it's a
good enough job: that feature is too young to be sure.
next prev parent reply other threads:[~2022-08-17 12:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-16 14:33 bug#57245: 29.0.50; M-> in a large XML file (without long lines) is slow Dmitry Gutov
2022-08-16 16:54 ` Eli Zaretskii
2022-08-16 18:40 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-08-16 18:59 ` Eli Zaretskii
2022-08-16 19:32 ` Dmitry Gutov
2022-08-16 20:22 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-08-16 20:49 ` Dmitry Gutov
2022-08-16 21:45 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-08-16 22:20 ` Dmitry Gutov
2022-08-17 11:36 ` Eli Zaretskii
2022-08-17 11:46 ` Dmitry Gutov
2022-08-17 12:16 ` Eli Zaretskii
2022-08-17 12:30 ` Dmitry Gutov
2022-08-17 12:33 ` Eli Zaretskii
2022-08-17 12:46 ` Dmitry Gutov
2022-08-17 11:24 ` Eli Zaretskii
2022-08-17 12:14 ` Dmitry Gutov
2022-08-17 12:20 ` Eli Zaretskii [this message]
2022-08-17 12:40 ` Dmitry Gutov
2022-08-17 13:20 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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