(define-key map "-" 'notmuch-tree-remove-tag)
(define-key map "+" 'notmuch-tree-add-tag)
(define-key map "*" 'notmuch-tree-tag-thread)
(define-key map " " 'notmuch-tree-scroll-or-next)
(define-key map "-" 'notmuch-tree-remove-tag)
(define-key map "+" 'notmuch-tree-add-tag)
(define-key map "*" 'notmuch-tree-tag-thread)
(define-key map " " 'notmuch-tree-scroll-or-next)