CkCommentReplyActionBuilder<T> typedef
CkCommentReplyActionBuilder<T> =
Widget Function(T item, int depth, VoidCallback expandReplies)
Builds the "reply" affordance for item. expandReplies is supplied by
the sheet — call it from your widget's tap handler (in addition to any
app-specific logic, like focusing a composer) to reveal item's replies.
Implementation
typedef CkCommentReplyActionBuilder<T> =
Widget Function(T item, int depth, VoidCallback expandReplies);