update special folders

MediaBrowser.Server.Implementations/Devices/CameraUploadsFolder.cs

@@ -22,21 +22,7 @@ namespace MediaBrowser.Server.Implementations.Devices
                 return false;
             }
 
-            return GetChildren(user, true).Any() &&
+            return base.IsVisible(user) && HasChildren();
-                base.IsVisible(user);
-        }
-
-        public override bool IsHidden
-        {
-            get
-            {
-                return base.IsHidden || !Children.Any();
-            }
-        }
-
-        public override bool IsHiddenFromUser(User user)
-        {
-            return false;
         }
 
         public override string CollectionType
@@ -48,6 +34,23 @@ namespace MediaBrowser.Server.Implementations.Devices
         {
             return typeof(CollectionFolder).Name;
         }
+
+        private bool? _hasChildren;
+        private bool HasChildren()
+        {
+            if (!_hasChildren.HasValue)
+            {
+                _hasChildren = LibraryManager.GetItemIds(new InternalItemsQuery { ParentId = Id }).Count > 0;
+            }
+
+            return _hasChildren.Value;
+        }
+
+        protected override System.Threading.Tasks.Task ValidateChildrenInternal(IProgress<double> progress, System.Threading.CancellationToken cancellationToken, bool recursive, bool refreshChildMetadata, Controller.Providers.MetadataRefreshOptions refreshOptions, Controller.Providers.IDirectoryService directoryService)
+        {
+            _hasChildren = null;
+            return base.ValidateChildrenInternal(progress, cancellationToken, recursive, refreshChildMetadata, refreshOptions, directoryService);
+        }
     }
 
     public class CameraUploadsDynamicFolder : IVirtualFolderCreator

MediaBrowser.Server.Implementations/Playlists/ManualPlaylistsFolder.cs

@@ -34,11 +34,6 @@ namespace MediaBrowser.Server.Implementations.Playlists
             }
         }
 
-        public override bool IsHiddenFromUser(User user)
-        {
-            return false;
-        }
-
         public override string CollectionType
         {
             get { return Model.Entities.CollectionType.Playlists; }