(define-key map "=" 'notmuch-refresh-this-buffer)
(define-key map (kbd "M-=") 'notmuch-refresh-all-buffers)
(define-key map "G" 'notmuch-poll-and-refresh-this-buffer)
(define-key map "=" 'notmuch-refresh-this-buffer)
(define-key map (kbd "M-=") 'notmuch-refresh-all-buffers)
(define-key map "G" 'notmuch-poll-and-refresh-this-buffer)