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Re: How to add pseudo vector types

From: Eli Zaretskii
Subject: Re: How to add pseudo vector types
Date: Sat, 24 Jul 2021 09:02:34 +0300

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: casouri@gmail.com,  cpitclaudel@gmail.com,  emacs-devel@gnu.org
> Date: Fri, 23 Jul 2021 16:28:16 -0400
> >> > But that's how the current font-lock and indentation work: they never
> >> > look beyond the narrowing limits.
> >> Not quite: that's true for indentation, but for font-lock we have
> >> `font-lock-dont-widen` (i.e. by default, font-lock widens temporarily
> >> while it does its job).
> > jit-lock never requests fontifications outside of the accessible
> > portion, because redisplay doesn't look there.
> But font-lock may look (and fontify) beyond the narrowing, and
> when it calls `syntax-ppss` it will usually parse from 1 rather than
> from `point-min`.

Yes, and that's why I said that callers should call 'widen' if they
need to do so.

The question is what should TS reading do _by_default_.

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