(define-key map "z" 'notmuch-tree-to-tree)
(define-key map "n" 'notmuch-tree-next-matching-message)
(define-key map "p" 'notmuch-tree-prev-matching-message)
(define-key map "z" 'notmuch-tree-to-tree)
(define-key map "n" 'notmuch-tree-next-matching-message)
(define-key map "p" 'notmuch-tree-prev-matching-message)