bug#35383: 27.0.50; Complete process of decoding Gnus group names

[Eric Abrahamsen <eric@ericabrahamsen.net>]

On 04/30/19 20:11 PM, Eli Zaretskii wrote:
>> From: Eric Abrahamsen <eric@ericabrahamsen.net>
>> Cc: yamaoka@jpl.org,  35383@debbugs.gnu.org
>> Date: Tue, 30 Apr 2019 10:03:46 -0700
>> 
>> I think that's sufficient. I'm really only looking at two variables:
>> `gnus-agent-file-coding-system', which I'm 100% sure is only used
>> internally by Gnus/Emacs, and `nnmail-active-file-coding-system', which
>> I'm 99% sure is only used internally.
>
> It sounds like utf-8-emacs is TRT in both cases.
>
>> > What other checks and guarantees did you consider?  (Sorry, I didn't
>> > read the entire thread, so maybe just point me to the message where
>> > you described this.)
>> 
>> That's where the encoding cookie idea came from -- if there's no cookie,
>> read as 'raw-text, otherwise honor the cookie. But as Katsumi Yamaoka
>> pointed out, the way Gnus reads the file will ignore any encoding
>> cookie, so that's no good.
>
> You could give up the cookie.  It is only important if the file is
> visited by "C-x C-f" etc., which will be rare.  So having a cookie is
> a nicety, not a requirement.

Right, I think that was the conclusion. But do you have any other advice
about making sure that files previously written as 'raw-text are read
correctly by the updated code? It works on my machine™, but is that just
because my locale is unicode?