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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: emacs-tree-sitter and Emacs
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In-Reply-To: <y2tdefeet5oo67.fsf@lx-birch.ad.sei.cmu.edu> (message from
 Michael Welsh Duggan on Thu, 02 Apr 2020 12:19:44 -0400)
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> From: Michael Welsh Duggan <mwd@cert.org>
> Cc: <mwd@md5i.com>, <stephen_leake@stephe-leake.org>, <emacs-devel@gnu.org>
> Date: Thu, 02 Apr 2020 12:19:44 -0400
> 
> >> > Each buffer always knows which part of it remains unchanged.  When
> >> > fontification is invoked, it should start from that place.  So there's
> >> > no need to parse _all_ prior context.
> >> 
> >> Why not?  Won't it miss that hypothetical opening comment delimiter, for
> >> example?
> >
> > No, because that was already taken care of when that comment delimiter
> > was inserted.
> 
> In which case it's covered by the paragraph you omitted.

I don't think it is, because you were talking about parsing the full
buffer, whereas I'm talking about parsing only what affects the
display in the window.