GNU bug report logs - #78402
treesit after-change-functions

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From: Juri Linkov <juri <at> linkov.net>
To: 78402 <at> debbugs.gnu.org
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, Yuan Fu <casouri <at> gmail.com>
Subject: bug#78402: treesit after-change-functions
Date: Tue, 13 May 2025 09:27:45 +0300

This new request is the continuation from bug#77256 and
https://lists.gnu.org/archive/html/emacs-devel/2025-05/msg00300.html
about updating treesit ranges for after-change-functions,
particularly for outline--fix-buttons-after-change that uses ranges.

Hopefully Yuan could verify how implementable is this:

> BTW the fix should be fairly simple, AFAICT: the `treesit.c` code is
> told about the buffer change before `after-change-functions` runs, so it
> can record "ranges need to be updated" somewhere, and then lazily update
> the ranges next time some code uses treesit functions that depend on the
> ranges (e.g. outline's after-change function).  If the fully automatic
> lazy update is too eager, we can delay it to an explicit call to
> `treesit-ensure-ranges-are-uptodate` which outline's after-change
> function would have to call manually (same as all other current calls
> to `treesit-update-ranges`)

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