Disable chat for the first 5s (configurable) after joining a server.

OpenRA.Game/Network/UnitOrders.cs

@@ -34,6 +34,21 @@ namespace OpenRA.Network
 					TextNotificationsManager.AddSystemLine(order.TargetString);
 					break;
 
+				case "DisableChatEntry":
+					{
+						// Order must originate from the server
+						if (clientId != 0)
+							break;
+
+						// Server may send MaxValue to indicate that it is disabled until further notice
+						if (order.ExtraData == uint.MaxValue)
+							TextNotificationsManager.ChatDisabledUntil = uint.MaxValue;
+						else
+							TextNotificationsManager.ChatDisabledUntil = Game.RunTime + order.ExtraData;
+
+						break;
+					}
+
 				case "Chat":
 					{
 						var client = orderManager.LobbyInfo.ClientWithIndex(clientId);