bug#58507: Emacs does not preserve the coding system

[Juhana Sadeharju]

Hello. I have now tested this with versions 24.3, 25.3 and latest 28.2. All have this problem.

First I create a new file with c-x c-f. By default, it has coding system iso-latin-9-dos.

I change the coding system to utf-8 via the buffer's bottombar. Char "0" changes to "U".

Then I write "äöäöäö" and quit emacs.

When I rerun the emacs and open the text, the "öä" looks wrong and coding system is back at iso-latin-9-dos.

I use Total Commander's View to verify the file is ok. The file goes wrong only if I now save the buffer.

What helps is c-x ret r which asks the coding system -- I type utf-8.

Also helps when I add ";;; -*- coding: utf-8-dos; -*-" to the top of file. I will use this method as solution, but this is too advanced for regular users -- please check what is the problem.

Windows 11 Home, ver 22H2, installed 11.10.2022, HP Pavilion Gaming Desktop TG01-2xxx

pe 14. lokak. 2022 klo 13.42 Eli Zaretskii <eliz@gnu.org> kirjoitti:

> From: Juhana Sadeharju <johanrainhill@gmail.com>
> Date: Fri, 14 Oct 2022 09:02:25 +0300
>
> Hello. I did set the coding system to utf-8 but at quit/restart the file goes to iso-latin-dos and chars such as ä
> and ö becomes unreadable. Windows 11. Both the latest Emacs and older version 25.3 has this same
> problem.

Please tell the details: how did you set coding system to utf-8, and
how did you see that the file goes to iso-latin-dos.  We need these
details to investigate the problem.

Thanks.