Add new virtual float for username to timestamp padding

osu.Game.Tests/Visual/Online/TestSceneStandAloneChatDisplay.cs

@@ -32,6 +32,12 @@ public class TestSceneStandAloneChatDisplay : OsuTestScene
             Id = 4,
         };
 
+        private readonly User longUsernameUser = new User
+        {
+            Username = "Very Long Long Username",
+            Id = 5,
+        };
+
         [Cached]
         private ChannelManager channelManager = new ChannelManager();
 
@@ -99,6 +105,12 @@ protected override void LoadComplete()
                 Sender = admin,
                 Content = "Okay okay, calm down guys. Let's do this!"
             }));
+
+            AddStep("message from long username", () => testChannel.AddNewMessages(new Message(sequence++)
+            {
+                Sender = longUsernameUser,
+                Content = "Hi guys, my new username is lit!"
+            }));
         }
     }
 }

osu.Game/Online/Chat/StandAloneChatDisplay.cs

@@ -146,6 +146,7 @@ protected class StandAloneMessage : ChatLine
 
             protected override float HorizontalPadding => 10;
             protected override float MessagePadding => 120;
+            protected override float TimestampPadding => 130;
 
             public StandAloneMessage(Message message)
                 : base(message)

osu.Game/Overlays/Chat/ChatLine.cs

@@ -31,7 +31,9 @@ public class ChatLine : CompositeDrawable
 
         protected virtual float MessagePadding => default_message_padding;
 
-        private const float timestamp_padding = 65;
+        private const float default_timestamp_padding = 65;
+
+        protected virtual float TimestampPadding => default_timestamp_padding;
 
         private const float default_horizontal_padding = 15;
 
@@ -94,7 +96,7 @@ private void load(OsuColour colours)
                 Font = OsuFont.GetFont(size: TextSize, weight: FontWeight.Bold, italics: true),
                 Anchor = Anchor.TopRight,
                 Origin = Anchor.TopRight,
-                MaxWidth = default_message_padding - timestamp_padding
+                MaxWidth = default_message_padding - TimestampPadding
             };
 
             if (hasBackground)
@@ -149,7 +151,7 @@ private void load(OsuColour colours)
                         new MessageSender(message.Sender)
                         {
                             AutoSizeAxes = Axes.Both,
-                            Padding = new MarginPadding { Left = timestamp_padding },
+                            Padding = new MarginPadding { Left = TimestampPadding },
                             Origin = Anchor.TopRight,
                             Anchor = Anchor.TopRight,
                             Child = effectedUsername,