where KEY is a key binding, LABEL is a string label to display in
the buffer, and ACTION is a nullary function to call. LABEL may
be null, in which case the action will still be bound, but will
-not appear in the pop-up buffer.
-"
+not appear in the pop-up buffer."
(let* ((items (notmuch-jump--format-actions action-map))
;; Format the table of bindings and the full prompt