[display] support Dynamic on typeDefinition

closes #7295

src/context/display/displayEmitter.ml

@@ -181,6 +181,7 @@ let raise_position_of_type t =
 				| TMono r -> (match !r with None -> raise_position [null_pos] | Some t -> follow_null t)
 				| TLazy f -> follow_null (lazy_type f)
 				| TAbstract({a_path = [],"Null"},[t]) -> follow_null t
+				| TDynamic _ -> !t_dynamic_def
 				| _ -> t
 		in
 		try