[PATCH v2] emacs: Improve notmuch-message-mode initialization

[David Bremner]

Michal Sojka <sojkam1 at fel.cvut.cz> writes:

> Recent addition of notmuch-message-mode introduced several problems:
>
> 1. When message-setup-hook is used to set buffer local variables,
>    these settings are not effective, because all buffer local
>    variables are immediately erased by notmuch-message-mode
>    initialization.
>
> 2. message-mode-hook gets invoked twice - first when message-mail
>    invokes message-mode and second when notmuch-mua-mail invokes
>    notmuch-message-mode.
>
> This commit fixes these problems by replacing a call to message-mail
> with notmuch-specific code that is (hopefully) equivalent to
> message-mail functionality before introduction of
> notmuch-message-mode.
>
> We first initialize notmuch-message-mode with
> notmuch-mua-pop-to-buffer, which is a modified version of
> message-pop-to-buffer and then call message-setup-1, which is the only
> functionality of message-mail that is needed for notmuch.

This doesn't break anything for me, and looks fairly sane. I'm not sure
if the indirectrion of notmuch-mua-get-switch-function is still needed,
but that can wait for an optional followup patch.