feat: Bring back MusicManagerMixin

src/main/java/com/aetherteam/cumulus/mixin/mixins/client/MusicManagerMixin.java

@@ -0,0 +1,26 @@
+package com.aetherteam.cumulus.mixin.mixins.client;
+
+import com.aetherteam.cumulus.client.CumulusClient;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.sounds.MusicManager;
+import net.minecraft.sounds.Music;
+import net.minecraft.sounds.Musics;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.ModifyVariable;
+
+@Mixin(MusicManager.class)
+public class MusicManagerMixin {
+    /**
+     * This mixin modifies the return of {@link Minecraft#getSituationalMusic()} as it is given to the music variable in {@link MusicManager}.
+     * @param music The original {@link Music} variable.
+     * @return The modified {@link Music} variable.
+     */
+    @ModifyVariable(method = "tick()V", at = @At(value = "STORE"))
+    public Music injected(Music music) {
+        if (music == Musics.MENU && CumulusClient.MENU_HELPER.getActiveMusic() != null) {
+            return CumulusClient.MENU_HELPER.getActiveMusic();
+        }
+        return music;
+    }
+}

src/main/resources/cumulus_menus.mixins.json

@@ -10,6 +10,7 @@
     "defaultRequire": 1
   },
   "client": [
+    "client.MusicManagerMixin",
     "client.accessor.CreateWorldScreenAccessor",
     "client.accessor.RealmsPlayerScreenAccessor",
     "client.accessor.ScreenAccessor",