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

[Eli Zaretskii]

> Cc: 55870@debbugs.gnu.org
> Date: Wed, 13 Jul 2022 11:01:55 +0800
> From:  Bruce via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
>  > Can you reproduce the problem in a more recent version of Emacs?  26.3
>  > is several years old.
> 
> I reproduce the problem in emacs 28.1. Please refer to the attachments.

After you visit the file, what does Emacs say if you type

  M-: buffer-file-coding-system RET

Also, the image you show says in the mode line

  Top of 219k (1,0)        10:32xxx 0.92

which is not what I'd expect from "emacs -Q".  So I think there are
some local changes or customizations in your Emacs that perhaps are
part of the issue somehow.  Please tell more about this build of Emacs
and how you invoke it.