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

[Eli Zaretskii]

> Cc: larsi@gnus.org, 55870@debbugs.gnu.org
> From: Bruce <brucelam1982pi@anche.no>
> Date: Fri, 15 Jul 2022 20:44:59 +0800
> 
> 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

OK, thanks.

And is this a GUI session or a text-mode session?  That is, what is
the value of the variable window-system?

Also, what is the value of the variable selection-coding-system?