(let ((search-id-string (mapconcat 'identity (notmuch-search-find-thread-id-region beg end) " or ")))
(notmuch-call-notmuch-process "tag" (concat "+" tag) search-id-string)
(save-excursion
(let ((search-id-string (mapconcat 'identity (notmuch-search-find-thread-id-region beg end) " or ")))
(notmuch-call-notmuch-process "tag" (concat "+" tag) search-id-string)
(save-excursion