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Re: Reliable after-change-functions (via: Using incremental parsing in E

From: Stephen Leake
Subject: Re: Reliable after-change-functions (via: Using incremental parsing in Emacs)
Date: Tue, 31 Mar 2020 16:57:53 -0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (windows-nt)

Eli Zaretskii <address@hidden> writes:

>> Is it really a bug of dired-mode? Dired-mode probably has a good
>> reason to bind `inhibit-modification-hooks` to t. And if we provide
>> such feature (disabling after-change-functions), we should expect
>> people using it. Maybe there should be a reliable way to be informed
>> of buffer changes (that cannot be silenced).
> I agree with Stefan: it's a bug.  All dired-readin needs to do is call
> the modification hooks after it's done reading in the directory.  It's
> just an optimization that it inhibits the hooks while it runs: read
> the comments there and you will see why it is done.
> IMO, inhibit-modification-hooks is for when some code makes a
> temporary change, or a change that no one is supposed to care about,
> like changing faces.  Any other case is a bug.

ada-mode occasionally binds wisi-inhibit-parse for a similar reason; it
is writing Ada source, so it is about to make several changes, during
which the buffer will be syntactically incorrect, but it will be correct
when done. The wisi after-change-functions still record changed
regions, but the parser is not called until all the changes are done.

Perhaps tree-sitter and eglot could use a similar approach.

-- Stephe

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