Fix some namespaces.

osu.Game/Beatmaps/Drawables/BeatmapGroup.cs

@@ -4,18 +4,11 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
 using osu.Framework;
-using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Primitives;
 using osu.Game.Database;
-using OpenTK;
-using osu.Framework.Allocation;
-
-namespace osu.Game.Beatmaps.Drawable
+
+namespace osu.Game.Beatmaps.Drawables
 {
     class BeatmapGroup : IStateful<BeatmapGroupState>
     {

osu.Game/Beatmaps/Drawables/BeatmapPanel.cs

@@ -3,6 +3,7 @@
 
 using System;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
 using osu.Framework.Graphics.Sprites;
@@ -11,9 +12,8 @@ using osu.Game.Graphics;
 using osu.Game.Graphics.UserInterface;
 using OpenTK;
 using OpenTK.Graphics;
-using osu.Framework.Graphics.Colour;
 
-namespace osu.Game.Beatmaps.Drawable
+namespace osu.Game.Beatmaps.Drawables
 {
     class BeatmapPanel : Panel
     {

osu.Game/Beatmaps/Drawables/BeatmapSetHeader.cs

@@ -2,21 +2,19 @@
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
+using osu.Framework.Allocation;
+using osu.Framework.Configuration;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
 using osu.Framework.Graphics.Sprites;
-using osu.Game.Database;
+using osu.Game.Configuration;
 using osu.Game.Graphics;
 using OpenTK;
 using OpenTK.Graphics;
-using osu.Framework.Allocation;
-using osu.Framework.Configuration;
-using osu.Game.Configuration;
-using osu.Framework.Graphics.Colour;
-using osu.Framework;
-
-namespace osu.Game.Beatmaps.Drawable
+
+namespace osu.Game.Beatmaps.Drawables
 {
     class BeatmapSetHeader : Panel
     {
@@ -31,7 +29,7 @@ namespace osu.Game.Beatmaps.Drawable
             this.beatmap = beatmap;
             Hidden = false;
 
-            Children = new Framework.Graphics.Drawable[]
+            Children = new Drawable[]
             {
                 new PanelBackground(beatmap)
                 {
@@ -158,7 +156,6 @@ namespace osu.Game.Beatmaps.Drawable
             [BackgroundDependencyLoader]
             private void load(OsuGameBase game)
             {
-                //todo: masking check
                 new BeatmapBackground(working)
                 {
                     Anchor = Anchor.Centre,

osu.Game/Beatmaps/Drawables/DifficultyIcon.cs

@@ -1,13 +1,13 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Game.Graphics;
-using OpenTK;
-using OpenTK.Graphics;
-
-namespace osu.Game.Beatmaps.Drawable
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Graphics;
+using OpenTK;
+using OpenTK.Graphics;
+
+namespace osu.Game.Beatmaps.Drawables
 {
     class DifficultyIcon : Container
     {

osu.Game/Beatmaps/Drawables/Panel.cs

@@ -8,7 +8,7 @@ using osu.Framework.Input;
 using OpenTK;
 using OpenTK.Graphics;
 
-namespace osu.Game.Beatmaps.Drawable
+namespace osu.Game.Beatmaps.Drawables
 {
     class Panel : Container, IStateful<PanelSelectedState>
     {
@@ -17,9 +17,9 @@ namespace osu.Game.Beatmaps.Drawable
         public bool Hidden = true;
         private Container nestedContainer;
 
-        protected override Container<Framework.Graphics.Drawable> Content => nestedContainer;
+        protected override Container<Drawable> Content => nestedContainer;
 
-        public Panel()
+        protected Panel()
         {
             Height = MAX_HEIGHT;
             RelativeSizeAxes = Axes.X;