bug#59693: 29.0.50; treesitter in base buffer doesn't respond to modifications in indirect buffer correctly

[Yuan Fu]

> On Dec 6, 2022, at 4:17 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Mon, 5 Dec 2022 18:15:07 -0800
>> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
>> 59693@debbugs.gnu.org,
>> miha@kamnitnik.top
>> 
>> 1. Only allow base buffer to have parsers, no change is needed for insdel.c, 
>> treesit_record_change can find the base buffer and update its parsers. We 
>> can ask indirect buffers to use their base buffer’s parser. Unless the base 
>> buffer is narrowed, I think it will work fine. 
> 
> I think this is fine, but we need to document it.
> 
>> I remember that there were a discussion along the lines of user-narrow vs 
>> low-level narrow, what was the outcome of that discussion?
> 
> Nothing in particular, and I don't think it's relevant.  If some mode needs
> to widen, it can.
> 
> Thanks.

Here is a patch that does #1.

Yuan

indirect.patch
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