sync updates

MediaBrowser.Controller/Entities/CollectionFolder.cs

@@ -66,6 +66,22 @@ namespace MediaBrowser.Controller.Entities
             return CreateResolveArgs(directoryService).FileSystemChildren;
         }
 
+        internal override bool IsValidFromResolver(BaseItem newItem)
+        {
+            var newCollectionFolder = newItem as CollectionFolder;
+
+            if (newCollectionFolder != null)
+            {
+                if (!string.Equals(CollectionType, newCollectionFolder.CollectionType, StringComparison.OrdinalIgnoreCase))
+                {
+                    return false;
+                }
+            }
+
+
+            return base.IsValidFromResolver(newItem);
+        }
+
         private ItemResolveArgs CreateResolveArgs(IDirectoryService directoryService)
         {
             var path = ContainingFolderPath;

MediaBrowser.Controller/Sync/ISyncProvider.cs

@@ -25,4 +25,9 @@ namespace MediaBrowser.Controller.Sync
         /// <returns>DeviceProfile.</returns>
         DeviceProfile GetDeviceProfile(SyncTarget target);
     }
+
+    public interface IHasUniqueTargetIds
+    {
+        
+    }
 }