Re: X11 Compound Text vs ISO 2022

[David De La Harpe Golden]

On 07/07/10 00:38, David De La Harpe Golden wrote:
>  > A number of characters are output in '^[$-1'; such as:
>  > (encode-coding-string "ℜ" 'compound-text) ; U+211C BLACK-LETTER
> CAPITAL R
>  > "^[$-1\365\334^[-A"
>  > (encode-coding-string "ʻ" 'compound-text) ; U+02BB MODIFIER LETTER
> TURNED COMMA
>  > "^[$-1\244\333^[-A"
>
>  > That is encoded in mule-unicode-0100-24ff, essentially unknown outside
>  > Emacs.
>
> But actually I think emacs should be using using coding system
> compound-text-with-extensions by default, not coding system
> compound-text? At least if you haven't customized
> selection-coding-system.



Well, that probably "solves" one thing, but what about the use of JIS X 0213

The definition of coding systems compound-text and 
compound-text-with-extensions say (around line 1445 of 
lisp/international/mule-conf.el):

:charset-list 'iso-2022

Which accoding to define-coding-system doc means it thinks compound-text 
supports "all iso-2022 charsets"...

So maybe it could/should be trimmed to only those iso-2022 charsets in 
the compound text spec, though I'm not sure that naively adjusting 
:charset-list will work right, especially for 
compound-text-with-extensions  (I just managed to segfault emacs playing 
with it).