Re: [Emacs-diffs] emacs-26 0feb673: Display raw bytes as belonging to 'eight-bit' charset

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Date: Fri, 27 Jul 2018 15:03:48 -0400
> 
> > In the Thai language environment, that just might make sense.
> 
> I don't see why it would ever make sense.

because users of the Thai language environment most probably know and
understand what this charset is for.

> Actually, I don't understand why
> 
>     (char-charset (unibyte-char-to-multibyte #x90))
> 
> should return `tis620-2533`, since the tis620.2533 standard defines
> a coding-system similar to those of iso8859 and the corresponding chars
> all exist in the BMP of Unicode (the "Thai block" U+0E01 through
> U+0E7F), so I can't see any obvious reason why they should affect the
> 3x3fffxx private space used by Emacs for "eight-bit chars".

You are asking why we have this charset in the first place?

> Could it be just a bug?

No, it definitely isn't, look at how this charset is defined in
mule-conf.el.  Whether we still need it in modern Emacs is a separate
question; I don't know the answer to that, but maybe Handa-san does.