+ (when (and unfound
+ topic
+ (not (gnus-topic-goto-missing-topic topic)))
+ (gnus-topic-display-missing-topic topic)))))
+
+(defun gnus-topic-display-missing-topic (topic)
+ "Insert topic lines recursively for missing topics."
+ (let ((parent (gnus-topic-find-topology
+ (gnus-topic-parent-topic topic))))
+ (when (and parent
+ (not (gnus-topic-goto-missing-topic (caadr parent))))
+ (gnus-topic-display-missing-topic (caadr parent))))
+ (gnus-topic-goto-missing-topic topic)
+ ;; Skip past all groups in the topic we're in.
+ (while (gnus-group-group-name)
+ (forward-line 1))
+ (let* ((top (gnus-topic-find-topology topic))
+ (children (cddr top))
+ (type (cadr top))
+ (unread 0)
+ (entries (gnus-topic-find-groups
+ (car type) (car gnus-group-list-mode)
+ (cdr gnus-group-list-mode)))
+ entry)
+ (while children
+ (incf unread (gnus-topic-unread (caar (pop children)))))
+ (while (setq entry (pop entries))
+ (when (numberp (car entry))
+ (incf unread (car entry))))
+ (gnus-topic-insert-topic-line
+ topic t t (car (gnus-topic-find-topology topic)) nil unread)))
+
+(defun gnus-topic-goto-missing-topic (topic)
+ (if (gnus-topic-goto-topic topic)
+ (forward-line 1)
+ ;; Topic not displayed.
+ (let* ((top (gnus-topic-find-topology
+ (gnus-topic-parent-topic topic)))
+ (tp (reverse (cddr top))))
+ (if (not top)
+ (gnus-topic-insert-topic-line
+ topic t t (car (gnus-topic-find-topology topic)) nil 0)
+ (while (not (equal (caaar tp) topic))
+ (setq tp (cdr tp)))
+ (pop tp)
+ (while (and tp
+ (not (gnus-topic-goto-topic (caaar tp))))
+ (pop tp))
+ (if tp
+ (gnus-topic-forward-topic 1)
+ (gnus-topic-goto-missing-topic (caadr top)))))
+ nil))