Fix ender dragon model leaking client world

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/common/mixin/bugfix/ender_dragon_leak/EnderDragonRendererMixin.java

@@ -0,0 +1,24 @@
+package org.embeddedt.modernfix.common.mixin.bugfix.ender_dragon_leak;
+
+import net.minecraft.client.renderer.entity.EnderDragonRenderer;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(EnderDragonRenderer.class)
+@ClientOnlyMixin
+public abstract class EnderDragonRendererMixin {
+    @Shadow @Final private EnderDragonRenderer.DragonModel model;
+
+    /**
+     * Prevent leaking the client world through the entity reference.
+     */
+    @Inject(method = "render(Lnet/minecraft/world/entity/boss/enderdragon/EnderDragon;FFLcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/MultiBufferSource;I)V", at = @At("RETURN"))
+    private void clearDragonEntityReference(CallbackInfo ci) {
+        this.model.entity = null;
+    }
+}

common/src/main/resources/modernfix.accesswidener

@@ -29,4 +29,5 @@ accessible field net/minecraft/client/renderer/block/model/BlockModel GSON Lcom/
 accessible field net/minecraft/server/MinecraftServer resources Lnet/minecraft/server/ServerResources;
 accessible field net/minecraft/client/renderer/RenderStateShard name Ljava/lang/String;
 accessible method net/minecraft/client/gui/screens/Screen addButton (Lnet/minecraft/client/gui/components/AbstractWidget;)Lnet/minecraft/client/gui/components/AbstractWidget;
-accessible field net/minecraft/server/packs/resources/SimpleReloadableResourceManager namespacedPacks Ljava/util/Map;
+accessible field net/minecraft/server/packs/resources/SimpleReloadableResourceManager namespacedPacks Ljava/util/Map;
+accessible field net/minecraft/client/renderer/entity/EnderDragonRenderer$DragonModel entity Lnet/minecraft/world/entity/boss/enderdragon/EnderDragon;