This is an initial draft of a patch to allow the emacs frontend to
"widen" the reply: i.e., change the headers to reply-to-all after a
reply-to-sender has been started.

The reply cli json output is modified to always output the
reply-to-all headers.

Emacs message mode already as a key binding for widening reply (C-c
C-f w) so we use that.

There are some things that need to be worked out: do we want to allow
narrowing the reply (ie going from reply-to-all back to
reply-to-sender)? I did not implement this as it was slightly easier
not to, message-mode doesn't have this by default, and it's easy for a
user to remove recipients.

I have not updated tests (the reply json test fails) or the
schemata. I thought it was worth deciding what format we wanted for
the json first.

Finally, I am not sure I have got the overriding of
message-widen-reply keybinding right. It does seem to work.

Best wishes

Mark



Mark Walters (3):
  cli: show: separate out the printing of recipient headers
  cli: reply: additionally output reply-to-all headers to allow widen
    reply
  emacs: mua: allow the user to widen the reply

 emacs/notmuch-mua.el |   22 +++++++++++++++++++++-
 notmuch-client.h     |    3 +++
 notmuch-reply.c      |   18 +++++++++++++++++-
 notmuch-show.c       |   35 +++++++++++++++++++++--------------
 4 files changed, 62 insertions(+), 16 deletions(-)

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1.7.9.1