[wip] forge-topics-filter-milestone: New command

Author: tarsius

lisp/forge-topics.el

@@ -386,6 +386,11 @@ then display the respective menu, otherwise display no menu."
   :formatter (lambda (labels)
                (mapconcat #'identity (forge--format-labels labels) " ")))
 
+(transient-define-suffix forge-topics-filter-milestone ()
+  :class 'forge--topics-filter-command
+  :slot 'milestone
+  :reader #'forge-read-topic-milestone)
+
 ;;;; Display
 
 (transient-define-suffix forge-topics-set-order (order)