Moved and renamed MessageHistoryTextBox.cs for better fit.

osu.Game/Graphics/UserInterface/MessageHistoryTextBox.cs

@@ -3,12 +3,11 @@
 
 using System.Collections.Generic;
 using osu.Framework.Input.Events;
-using osu.Game.Graphics.UserInterface;
 using osuTK.Input;
 
-namespace osu.Game.Overlays.Chat
+namespace osu.Game.Graphics.UserInterface
 {
-    public class ChatRecentTextBox : FocusedTextBox
+    public class MessageHistoryTextBox : FocusedTextBox
     {
         private readonly List<string> messageHistory = new List<string>();
 
@@ -16,6 +15,15 @@ public class ChatRecentTextBox : FocusedTextBox
 
         private string originalMessage = string.Empty;
 
+        public MessageHistoryTextBox()
+        {
+            Current.ValueChanged += text =>
+            {
+                if (string.IsNullOrEmpty(text.NewValue))
+                    messageIndex = -1;
+            };
+        }
+
         protected override bool OnKeyDown(KeyDownEvent e)
         {
             /* Behavior:
@@ -53,12 +61,7 @@ protected override bool OnKeyDown(KeyDownEvent e)
                     return true;
             }
 
-            bool onKeyDown = base.OnKeyDown(e);
-
-            if (string.IsNullOrEmpty(Text))
-                messageIndex = -1;
-
-            return onKeyDown;
+            return base.OnKeyDown(e);
         }
 
         protected override void Commit()

osu.Game/Online/Chat/StandAloneChatDisplay.cs

@@ -12,6 +12,7 @@
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Input.Events;
 using osu.Game.Graphics;
+using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Chat;
 using osu.Game.Resources.Localisation.Web;
 using osuTK.Graphics;
@@ -119,7 +120,7 @@ private void channelChanged(ValueChangedEvent<Channel> e)
             AddInternal(drawableChannel);
         }
 
-        public class ChatTextBox : ChatRecentTextBox
+        public class ChatTextBox : MessageHistoryTextBox
         {
             protected override bool OnKeyDown(KeyDownEvent e)
             {

osu.Game/Overlays/Chat/ChatTextBox.cs

@@ -2,11 +2,12 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Bindables;
+using osu.Game.Graphics.UserInterface;
 using osu.Game.Resources.Localisation.Web;
 
 namespace osu.Game.Overlays.Chat
 {
-    public class ChatTextBox : ChatRecentTextBox
+    public class ChatTextBox : MessageHistoryTextBox
     {
         public readonly BindableBool ShowSearch = new BindableBool();