Use different icon style on hold note heads

osu.Game.Rulesets.Mania/Skinning/Argon/ArgonHoldNoteHeadPiece.cs

@@ -0,0 +1,19 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Shapes;
+using osuTK;
+
+namespace osu.Game.Rulesets.Mania.Skinning.Argon
+{
+    internal partial class ArgonHoldNoteHeadPiece : ArgonNotePiece
+    {
+        protected override Drawable CreateIcon() => new Circle
+        {
+            Anchor = Anchor.Centre,
+            Origin = Anchor.Centre,
+            Size = new Vector2(20, 5),
+        };
+    }
+}

osu.Game.Rulesets.Mania/Skinning/Argon/ArgonNotePiece.cs

@@ -36,7 +36,7 @@ namespace osu.Game.Rulesets.Mania.Skinning.Argon
             CornerRadius = CORNER_RADIUS;
             Masking = true;
 
-            InternalChildren = new Drawable[]
+            InternalChildren = new[]
             {
                 shadow = new Box
                 {
@@ -65,18 +65,22 @@ namespace osu.Game.Rulesets.Mania.Skinning.Argon
                     RelativeSizeAxes = Axes.X,
                     Height = CORNER_RADIUS * 2,
                 },
-                new SpriteIcon
-                {
-                    Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
-                    Y = 4,
-                    Icon = FontAwesome.Solid.AngleDown,
-                    Size = new Vector2(20),
-                    Scale = new Vector2(1, 0.7f)
-                }
+                CreateIcon(),
             };
         }
 
+        protected virtual Drawable CreateIcon() => new SpriteIcon
+        {
+            Anchor = Anchor.Centre,
+            Origin = Anchor.Centre,
+            Y = 4,
+            // TODO: replace with a non-squashed version.
+            // The 0.7f height scale should be removed.
+            Icon = FontAwesome.Solid.AngleDown,
+            Size = new Vector2(20),
+            Scale = new Vector2(1, 0.7f)
+        };
+
         [BackgroundDependencyLoader(true)]
         private void load(IScrollingInfo scrollingInfo, DrawableHitObject? drawableObject)
         {

osu.Game.Rulesets.Mania/Skinning/Argon/ManiaArgonSkinTransformer.cs

@@ -50,6 +50,8 @@ namespace osu.Game.Rulesets.Mania.Skinning.Argon
                             return new ArgonHoldNoteTailPiece();
 
                         case ManiaSkinComponents.HoldNoteHead:
+                            return new ArgonHoldNoteHeadPiece();
+
                         case ManiaSkinComponents.Note:
                             return new ArgonNotePiece();