Added immediate TP failure message for TPs to regions that aren't there,

instead of the 130s timeout somewhere. Additionally, mark the map-tile as
offline. This partly fixes the TP problems of Mantis 2332; the rest is a viewer
problem (just relogin).

OpenSim/Region/Environment/Modules/World/WorldMap/WorldMapModule.cs

@@ -248,9 +248,43 @@ namespace OpenSim.Region.Environment.Modules.World.WorldMap
         public virtual void RequestMapBlocks(IClientAPI remoteClient, int minX, int minY, int maxX, int maxY, uint flag)
         {
             List<MapBlockData> mapBlocks;
-            mapBlocks = m_scene.SceneGridService.RequestNeighbourMapBlocks(minX - 4, minY - 4, minX + 4, minY + 4);
+            if ((flag & 0x10000) != 0)  // user clicked on the map a tile that isn't visible
+            {
+                List<MapBlockData> response = new List<MapBlockData>();
+                
+                // this should return one mapblock at most. But make sure: Look whether the one we requested is in there
+                mapBlocks = m_scene.SceneGridService.RequestNeighbourMapBlocks(minX, minY, maxX, maxY);
+                if (mapBlocks != null)
+                {
+                    foreach (MapBlockData block in mapBlocks)
+                    {
+                        if (block.X == minX && block.Y == minY)
+                        {
+                            // found it => add it to response
+                            response.Add(block);
+                            break;
+                        }
+                    }
+                }
+                
+                if (response.Count == 0)
+                {
+                    // response still empty => couldn't find the map-tile the user clicked on => tell the client
+                    MapBlockData block = new MapBlockData();
+                    block.X = (ushort)minX;
+                    block.Y = (ushort)minY;
+                    block.Access = 254; // == not there
+                    response.Add(block);
+                }
+                remoteClient.SendMapBlock(response, 0);
+            }
+            else
+            {
+                // normal mapblock request. Use the provided values
+                mapBlocks = m_scene.SceneGridService.RequestNeighbourMapBlocks(minX - 4, minY - 4, maxX + 4, maxY + 4);
                 remoteClient.SendMapBlock(mapBlocks, flag);
             }
+        }
 
         public Hashtable OnHTTPGetMapImage(Hashtable keysvals)
         {

OpenSim/Region/Environment/Scenes/SceneCommunicationService.cs

@@ -736,6 +736,25 @@ namespace OpenSim.Region.Environment.Scenes
                         avatar.ControllingClient.SendTeleportFailed("Remote Region appears to be down");
                     }
                 }
+                else
+                {
+                    // TP to a place that doesn't exist (anymore)
+                    // Inform the viewer about that
+                    avatar.ControllingClient.SendTeleportFailed("The region you tried to teleport to doesn't exist anymore");
+                    
+                    // and set the map-tile to '(Offline)'
+                    uint regX, regY;
+                    Helpers.LongToUInts(regionHandle, out regX, out regY);
+                    
+                    MapBlockData block = new MapBlockData();
+                    block.X = (ushort)(regX / Constants.RegionSize);
+                    block.Y = (ushort)(regY / Constants.RegionSize);
+                    block.Access = 254; // == not there
+                    
+                    List<MapBlockData> blocks = new List<MapBlockData>();
+                    blocks.Add(block);
+                    avatar.ControllingClient.SendMapBlock(blocks, 0);
+                }
             }
         }