(define-key map "-" 'notmuch-search-remove-tag)
(define-key map "+" 'notmuch-search-add-tag)
(define-key map (kbd "RET") 'notmuch-search-show-thread)
(define-key map "-" 'notmuch-search-remove-tag)
(define-key map "+" 'notmuch-search-add-tag)
(define-key map (kbd "RET") 'notmuch-search-show-thread)