+(defun notmuch-tree-matching-message (&optional prev)
+ "Move to the next or previous matching message"
+ (interactive "P")
+ (forward-line (if prev -1 nil))
+ (notmuch-tree-goto-matching-message prev)
+ (when (window-live-p notmuch-tree-message-window)
+ (notmuch-tree-show-message-in)))
+