bug#65299: 29.1; ZIP archived WEBP images can not be displayed correctly

[Eli Zaretskii]

> From: awrhygty@outlook.com
> Cc: 65299@debbugs.gnu.org
> Date: Tue, 15 Aug 2023 22:05:36 +0900
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > You need to say
> >
> >   C-x RET c no-conversion RET RET
> >
> > to open such files from a zip archive.
> >
> > Determining the right coding system when opening files from ZIP
> > archives is a tricky issue, and frequently needs forcing a certain
> > encoding manually.  I don't know how to do better in general, what
> > with all the possible sources of the files and their encodings.  A Zip
> > archive can include files from Unix systems or from Windows, and we
> > unzip by running the 'unzip' program.  So the usual defaults for
> > guessing the encoding don't really work.
> 
> At least modifying 'auto-coding-alist takes effect.

OK, but that cannot be done by default, since the right encoding is
not known in advance.