Re: master 9e9bc2af514: Correct documentation of selection-coding-system

[Stefan Kangas <stefankangas@gmail.com>]

Po Lu via Mailing list for Emacs changes <emacs-diffs@gnu.org> writes:

> diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
> index 9f969603023..56e4fe419e3 100644
> --- a/doc/lispref/frames.texi
> +++ b/doc/lispref/frames.texi
> @@ -4053,10 +4053,20 @@ under X, and @xref{Other Selections} for those elsewhere.
>  @end defun
>
>  @defopt selection-coding-system
> -This variable specifies the coding system to use when reading and
> -writing selections or the clipboard.  @xref{Coding
> -Systems}.  The default is @code{compound-text-with-extensions}, which
> -converts to the text representation that X11 normally uses.
> +This variable provides a coding system (@pxref{Coding Systems}) which
> +is used to encode selection data, and takes effect on MS-DOS,
> +MS-Windows and X@.
> +
> +Under MS-DOS and MS-Windows, it is the coding system by which all
> +clipboard text will be encoded and decoded, whereas on X it merely
> +supplies the EOL format of the selection text sent in response to a
> +request for text encoded by a matching coding system; which is to say
> +that if its value is @code{utf-8-dos}, it will influence requests for
> +@code{UTF8_STRING} data, but not those for @code{STRING}.
> +
> +Its default value is the system code page under MS-Windows 95, 98 or
> +Me, @code{utf-16le-dos} under NT/W2K/XP, @code{iso-latin-1-dos} on
> +MS-DOS, and @code{nil} elsewhere.
>  @end defopt

Could we please shift this around so that we mention free operating
systems before non-free ones (i.e. X before MS-Windows) and current
operating systems before obsolete ones (i.e. MS-Windows before XP and
MS-DOS)?

For example:

    Its default value is @code{nil}.  On old versions of MS-Windows ...

And so on for the other paragraphs.

Maybe the MS-DOS stuff could be moved to a footnote, or to some separate
file where we document that port.

Thanks in advance.