feat!: rename and reorganize

Extras/SortByInternalDifficulty/MU3/patch_UISortButton.cs

@@ -0,0 +1,31 @@
+using MU3.CustomUI;
+using System.Reflection;
+using UnityEngine;
+
+namespace MU3;
+
+class patch_UISortButton: UISortButton {
+    private MU3UIImageChanger _selectPreviewImageChanger;
+
+    protected override void Awake() {
+        base.Awake();
+
+        var spritesFi = typeof(MU3UIImageChanger).GetField("_sprites", BindingFlags.Instance | BindingFlags.NonPublic);
+        var changer = _selectPreviewImageChanger;
+
+        var oldSprites = (Sprite[])spritesFi.GetValue(changer);
+        var n = oldSprites.Length;
+        var newSprites = new Sprite[n + 1];
+
+        for(int i = 0; i < n; ++i) {
+            newSprites[i] = oldSprites[i];
+        }
+
+        Texture2D tex = new Texture2D(2, 2);
+        tex.LoadImage(InternalSortPreview.Bytes);
+
+        newSprites[n] = Sprite.Create(tex, new Rect(0, 0, 254, 121), newSprites[0].pivot);
+
+        spritesFi.SetValue(changer, newSprites);
+    }
+}