> internally. The latter produces a sexp with
> :headers (:Subject "" :From "" :To "" :Reply-To "" :Date "")
> even when the message has many more headers.
Yes, you are correct that currently format_headers_sprinter in
notmuch-show.c only outputs a fixed set of headers. Unlike indexing new
headers, I don't think there's any hidden complexity here, if someone is
looking for a project.