[PATCH] emacs: add '?' to some prefix keymaps to describe its bindings

[David Bremner]

Mark Walters <markwalters1009 at gmail.com> writes:

> Added function notmuch-subkeymap-help to describe keybindings of a
> subkeymap (eg after . or c in notmuch-search and notmuch-show).
> ---

pushed to master

d