GNU bug report logs - #41522
26.3; Narrowing can prevent syntax propertization

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Message #16 received at 41522-done <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Ikumi Keita <ikumi <at> ikumi.que.jp>
Cc: 41522-done <at> debbugs.gnu.org
Subject: Re: bug#41522: 26.3; Narrowing can prevent syntax propertization
Date: Tue, 26 May 2020 01:12:49 +0300

On 25.05.2020 20:02, Ikumi Keita wrote:
> I suppose that this means that the code should call syntax-ppss (or
> something like it) "before" narrowing is done, right?

Or call (syntax-ppss-flush-cache (point-min)) afterward.

> Hmm, then elisp programmers have to check whether each function used 
in the code uses narrowing+syntactic functions inside it if this kind of
problem happens. I feel it a bit troublesome but at the same time I 
understand it is very difficult to solve this problem cleanly.

One has to be careful with narrowing. It's an old problem.

> OK, I try to be aware of this matter afterwards. Thanks for your
advice!

Welcome!

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