Add display property on leave or unpublish event (#3426)

src/plugins/janus_videoroom.c

@@ -1013,7 +1013,8 @@ room-<unique room ID>: {
 {
 	"videoroom" : "event",
 	"room" : <room ID>,
-	"leaving : <unique ID of the participant who left>
+	"leaving : <unique ID of the participant who left>,
+	"display" : "<display name of the leaving participant, if any>"
 }
 \endverbatim
  *
@@ -4410,6 +4411,8 @@ static void janus_videoroom_leave_or_unpublish(janus_videoroom_publisher *partic
 	json_t *event = json_object();
 	json_object_set_new(event, "videoroom", json_string("event"));
 	json_object_set_new(event, "room", string_ids ? json_string(participant->room_id_str) : json_integer(participant->room_id));
+	if(participant->display)
+		json_object_set_new(event, "display", json_string(participant->display));
 	json_object_set_new(event, is_leaving ? (kicked ? "kicked" : "leaving") : "unpublished",
 		string_ids ? json_string(participant->user_id_str) : json_integer(participant->user_id));
 	janus_videoroom_notify_participants(participant, event, FALSE);
@@ -4419,6 +4422,8 @@ static void janus_videoroom_leave_or_unpublish(janus_videoroom_publisher *partic
 		json_object_set_new(info, "event", json_string(is_leaving ? (kicked ? "kicked" : "leaving") : "unpublished"));
 		json_object_set_new(info, "room", string_ids ? json_string(participant->room_id_str) : json_integer(participant->room_id));
 		json_object_set_new(info, "id", string_ids ? json_string(participant->user_id_str) : json_integer(participant->user_id));
+		if(participant->display)
+			json_object_set_new(info, "display", json_string(participant->display));
 		gateway->notify_event(&janus_videoroom_plugin, NULL, info);
 	}
 	if(is_leaving) {