support multi key pattern matching

internal/model/chatroom_v4.go

@@ -20,17 +20,9 @@ func (c *ChatRoomV4) Wrap() *ChatRoom {
 		users = ParseRoomData(c.ExtBuffer)
 	}
 
-	user2DisplayName := make(map[string]string, len(users))
-	for _, user := range users {
-		if user.DisplayName != "" {
-			user2DisplayName[user.UserName] = user.DisplayName
-		}
-	}
-
 	return &ChatRoom{
-		Name:             c.UserName,
-		Owner:            c.Owner,
-		Users:            users,
-		User2DisplayName: user2DisplayName,
+		Name:  c.UserName,
+		Owner: c.Owner,
+		Users: users,
 	}
 }