bug#55870: GNU Emacs 26.3, Select All(C-x h) does not work

[Bruce]

buffer-file-coding-system is a variable defined in ‘C source code’.
Its value is ‘chinese-gbk-unix’
Local in buffer chinese-book.txt; global value is utf-8-unix

On 2022/7/14 下午6:13, Eli Zaretskii wrote:
> > Cc: Eli Zaretskii <eliz@gnu.org>, 55870@debbugs.gnu.org
> > From: Bruce <brucelam1982pi@anche.no>
> > Date: Thu, 14 Jul 2022 18:09:45 +0800
> >
> > Both options reproduce the problem in my GNU/Linux.
> What about the question I asked:
>
> > After you visit the file, what does Emacs say if you type
> >
> >     M-: buffer-file-coding-system RET