+(defun notmuch-tree-filter (query)
+ "Filter or LIMIT the current search results based on an additional query string.
+
+Runs a new tree search matching only messages that match both the
+current search results AND the additional query string provided."
+ (interactive (list (notmuch-read-query "Filter search: ")))
+ (let ((notmuch-show-process-crypto (notmuch-tree--message-process-crypto))
+ (grouped-query (notmuch-group-disjunctive-query-string query))
+ (grouped-original-query (notmuch-group-disjunctive-query-string
+ (notmuch-tree-get-query))))
+ (notmuch-tree-close-message-window)
+ (notmuch-tree (if (string= grouped-original-query "*")
+ grouped-query
+ (concat grouped-original-query " and " grouped-query)))))
+