+Starting from notmuch 0.12 use `notmuch-search-tag-thread` instead:
+
+ (define-key notmuch-search-mode-map "S"
+ (lambda ()
+ "mark messages in thread as spam"
+ (interactive)
+ (notmuch-show-tag-thread "+spam" "-inbox")))
+
+Starting from notmuch 0.13 use `notmuch-search-tag` -- it has a little
+different usage syntax:
+
+ (define-key notmuch-search-mode-map "S"
+ (lambda ()
+ "mark messages in thread as spam"
+ (interactive)
+ (notmuch-search-tag '("+spam" "-inbox"))))