Core/Grid:

- Simplified CellArea calculation (Original author: SilverIce)

- Removed unused code in Cell class (Original author: SilverIce)

- Improve some Visit functions.

src/server/game/Chat/Chat.cpp

@@ -1224,7 +1224,7 @@ GameObject* ChatHandler::GetNearbyGameObject()
     GameObject* obj = NULL;
     Trinity::NearestGameObjectCheck check(*pl);
     Trinity::GameObjectLastSearcher<Trinity::NearestGameObjectCheck> searcher(pl, obj, check);
-    pl->VisitNearbyGridObject(999, searcher);
+    pl->VisitNearbyGridObject(SIZE_OF_GRIDS, searcher);
     return obj;
 }
 
@@ -1242,13 +1242,12 @@ GameObject* ChatHandler::GetObjectGlobalyWithGuidOrNearWithDbGuid(uint32 lowguid
         // search near player then
         CellCoord p(Trinity::ComputeCellCoord(pl->GetPositionX(), pl->GetPositionY()));
         Cell cell(p);
-        cell.data.Part.reserved = ALL_DISTRICT;
 
         Trinity::GameObjectWithDbGUIDCheck go_check(*pl, lowguid);
         Trinity::GameObjectSearcher<Trinity::GameObjectWithDbGUIDCheck> checker(pl, obj, go_check);
 
         TypeContainerVisitor<Trinity::GameObjectSearcher<Trinity::GameObjectWithDbGUIDCheck>, GridTypeMapContainer > object_checker(checker);
-        cell.Visit(p, object_checker, *pl->GetMap());
+        cell.Visit(p, object_checker, *pl->GetMap(), *pl, pl->GetGridActivationRange());
     }
 
     return obj;