bug#63750: 30.0.50; tree-sitter: `treesit-language-source-alist' is not customisable

[Yuan Fu]

> On May 27, 2023, at 10:32 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Sat, 27 May 2023 16:12:18 -0700
>> Cc: Mickey Petersen <mickey@masteringemacs.org>,
>> 63750@debbugs.gnu.org
>> 
>>> However, I think we decided to make it so that each installation
>>> should update the value of the variable with the data of the grammar
>>> just installed.  I see that we don't actually do that -- Yuan, am I
>>> misremembering this?  If not, would you please add code to add to the
>>> variable's value the data of every grammar that is installed?
>> 
>> Sure. Does it need to be preserved across sessions (ie, use custom)? Or just 
>> add for the current session?
> 
> Only for the current session.  Users who want it preserved should do
> it themselves (I will add that to the doc string when the code which
> updates the variable is installed).

Done.

Yuan