default charset for text/html selection in X11

[Robert Pluim]

Hi,

Iʼve been playing around with the `yank-media' stuff Lars added, and
Iʼve noticed that when yanking a selection with mime-type text/html
from Chromium, what Iʼm getting is a utf-8 encoded string, which makes
this:

(defun html-mode--html-yank-handler (_type html)
  (save-restriction
    (insert html)
    (ignore-errors
      (sgml-pretty-print (point-min) (point-max)))))

insert any codepoints > 127 as their constituent raw bytes
instead, eg U+A0 ends up as \xc2\xa0 in the buffer.

I *think* it should be OK to assume utf-8 here, and thus do:

(defun html-mode--html-yank-handler (_type html)
  (save-restriction
    (insert (decode-coding-string html 'utf-8 t))
    (ignore-errors
      (sgml-pretty-print (point-min) (point-max)))))

but I canʼt find a normative reference for that (if this was http, the
default charset would be iso-8859-1, but this isnʼt http).

Robert
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