[PATCH v2] notmuch/emacs: Observe the charset of text/html parts, where known.

[Austin Clements]

Quoth David Edmondson on Jan 12 at  1:31 pm:
> Add the charset of text/html parts to the JSON output of 'notmuch
> -show' when it is known. Observe the encoding when rendering such
> parts in emacs.

This seems like a fine interim solution to me, though I'd like to see
a comment above the change in format_part_content_json explaining why
we include the content charset for text/html and not for anything
else.  Perhaps something like,

/* For non-HTML text/* parts, we include the content in the JSON.
 * Since JSON must be Unicode, we handle charset decoding here and do
 * not report a charset to the caller.  For text/html parts, we do not
 * include the content.  If a caller is interested in text/html parts,
 * it should retrieve them separately.  Since this makes charset
 * decoding the responsibility on the caller, we report the charset
 * for text/html parts. */