(define-key map (kbd "M-TAB") (notmuch-tree-to-message-pane #'notmuch-show-previous-button))
(define-key map (kbd "<backtab>") (notmuch-tree-to-message-pane #'notmuch-show-previous-button))
(define-key map (kbd "TAB") (notmuch-tree-to-message-pane #'notmuch-show-next-button))
- (define-key map "e" (notmuch-tree-to-message-pane #'notmuch-tree-button-activate))
(define-key map "$" (notmuch-tree-to-message-pane #'notmuch-show-toggle-process-crypto))
;; bindings from show (or elsewhere) but we close the message pane first.