The command notmuch-interesting-buffer has got out of date -- it
doesn't mention notmuch-tree, and it still refers to message-mode not
notmuch-message-mode. Update both of these.
This fixes the bug that notmuch-cycle-notmuch-buffers does not include
notmuch-tree or notmuch-message-mode buffers in its cycling.
   (with-current-buffer b
     (memq major-mode '(notmuch-show-mode
                       notmuch-search-mode
+                      notmuch-tree-mode
                       notmuch-hello-mode
-                      message-mode))))
+                      notmuch-message-mode))))
 
 ;;;###autoload
 (defun notmuch-cycle-notmuch-buffers ()