Prints friendly message when user has its voice revoked and tries to send a message.

resources/languages/resources.properties

@@ -119,6 +119,7 @@ service.gui.CHAT_ROOM_USER_JOINED=has joined {0}
 service.gui.CHAT_ROOM_USER_LEFT=has left {0}
 service.gui.CHAT_ROOM_USER_KICKED=has been kicked from {0}
 service.gui.CHAT_ROOM_USER_QUIT=has quit {0}
+service.gui.CHAT_ROOM_SEND_MSG_FORBIDDEN=Message sending is forbidden (voice revoked)
 service.gui.CHAT_ROOM_SAVE_BUTTON_TOOLTIP=Saves the chat room for future use
 service.gui.CHAT_ROOM_REMOVE_BUTTON_TOOLTIP=Removes the selected room from the list of saved rooms
 service.gui.CHAT_ROOM_NAME=Chat room name

src/net/java/sip/communicator/impl/gui/main/chat/conference/ConferenceChatManager.java

@@ -362,6 +362,12 @@ else if (evt.getErrorCode()
             errorMsg = GuiActivator.getResources().getI18NString(
                 "service.gui.MSG_DELIVERY_INTERNAL_ERROR");
         }
+        else if (evt.getErrorCode()
+            == ChatRoomMessageDeliveryFailedEvent.FORBIDDEN)
+        {
+            errorMsg = GuiActivator.getResources().getI18NString(
+                "service.gui.CHAT_ROOM_SEND_MSG_FORBIDDEN");
+        }
         else
         {
             errorMsg = GuiActivator.getResources().getI18NString(

src/net/java/sip/communicator/impl/protocol/jabber/OperationSetBasicInstantMessagingJabberImpl.java

@@ -936,6 +936,13 @@ public void processPacket(Packet packet)
                         XMPPError error = packet.getError();
                         int errorResultCode
                             = ChatRoomMessageDeliveryFailedEvent.UNKNOWN_ERROR;
+
+                        if(error != null && error.getCode() == 403)
+                        {
+                            errorResultCode
+                                = ChatRoomMessageDeliveryFailedEvent.FORBIDDEN;
+                        }
+
                         String errorReason = error.getMessage();
 
                         ChatRoomMessageDeliveryFailedEvent evt =

src/net/java/sip/communicator/service/protocol/event/ChatRoomMessageDeliveryFailedEvent.java

@@ -59,6 +59,12 @@ public class ChatRoomMessageDeliveryFailedEvent
       */
      public static final int OFFLINE_MESSAGES_NOT_SUPPORTED = 5;
 
+     /**
+      * Set when delivery fails because we're trying to send a message to a
+      * a room where we are not allowed to send messages.
+      */
+     public static final int FORBIDDEN = 6;
+
      /**
       * An error code indicating the reason for the failure of this delivery.
       */