GNU bug report logs - #56682
Fix the long lines font locking related slowdowns

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Message #29 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 56682 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Fri, 22 Jul 2022 19:25:47 -0400

Before using a blunt tool like the forced-narrowing now in
`feature/long-lines-and-font-locking`, I think we should try and figure
out *why* the recipe below is so slow.

For example, the behavior surprises me because I can't see why `M-x`
should cause any font-locking at all in the `long-line.xml` file.

[ Other side note: IIRC `nxml-mode` uses font-lock and syntax-propertize
  in somewhat unusual ways (it started doing all of that work "by hand"
  in its own way, and only later was it coerced to try and play along
  with that "standard" infrastructure), so the problem may be specific to
  nxml-mode.  ]


        Stefan

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