Fix leaky FakeLevelData

Author: Nightenom

src/main/java/com/ldtteam/common/fakelevel/FakeLevel.java

@@ -130,7 +130,7 @@ public FakeLevel(final SOURCE levelSource,
         final boolean overrideBeLevel)
     {
         // we have to pass null in ctor, so realLevel can be used
-        super(new FakeLevelData(realLevel.getLevelData(), lightProvider),
+        super(new FakeLevelData(realLevel::getLevelData, lightProvider),
             realLevel.dimension(),
             realLevel.registryAccess(),
             realLevel.dimensionTypeRegistration(),
@@ -149,6 +149,7 @@ public FakeLevel(final SOURCE levelSource,
         this.lightEngine = new FakeLevelLightEngine(this);
 
         setRealLevel(realLevel); // intentionally due to init
+        ((FakeLevelData) getLevelData()).vanillaLevelData = () -> realLevel().getLevelData();
     }
 
     // ========================================
@@ -168,7 +169,6 @@ public void setRealLevel(final Level realLevel)
         }
 
         this.realLevel = realLevel;
-        ((FakeLevelData) this.getLevelData()).vanillaLevelData = realLevel == null ? null : realLevel.getLevelData();
     }
 
     public Level realLevel()

src/main/java/com/ldtteam/common/fakelevel/FakeLevelData.java

@@ -5,16 +5,17 @@
 import net.minecraft.world.level.GameRules;
 import net.minecraft.world.level.storage.LevelData;
 import net.minecraft.world.level.storage.WritableLevelData;
+import java.util.function.Supplier;
 
 /**
  * Porting: class is relatively small, just check super class manually (all of missing methods are/were just aliases)
  */
 public class FakeLevelData implements WritableLevelData
 {
-    protected LevelData vanillaLevelData;
+    protected Supplier<LevelData> vanillaLevelData;
     protected final IFakeLevelLightProvider lightProvider;
 
-    protected FakeLevelData(final LevelData vanillaLevelData, final IFakeLevelLightProvider lightProvider)
+    protected FakeLevelData(final Supplier<LevelData> vanillaLevelData, final IFakeLevelLightProvider lightProvider)
     {
         this.vanillaLevelData = vanillaLevelData;
         this.lightProvider = lightProvider;
@@ -35,13 +36,13 @@ public float getSpawnAngle()
     @Override
     public long getGameTime()
     {
-        return vanillaLevelData.getGameTime();
+        return vanillaLevelData.get().getGameTime();
     }
 
     @Override
     public long getDayTime()
     {
-        return lightProvider.forceOwnLightLevel() ? lightProvider.getDayTime() : vanillaLevelData.getDayTime();
+        return lightProvider.forceOwnLightLevel() ? lightProvider.getDayTime() : vanillaLevelData.get().getDayTime();
     }
 
     @Override
@@ -71,7 +72,7 @@ public boolean isHardcore()
     @Override
     public GameRules getGameRules()
     {
-        return vanillaLevelData.getGameRules();
+        return vanillaLevelData.get().getGameRules();
     }
 
     @Override