From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Etil <81570777+etil2jz@users.noreply.github.com>
Date: Mon, 13 Dec 2021 19:08:49 +0100
Subject: [PATCH] World Instance Flag

Original code by Cryptite, licensed under MIT
You can find the original code on https://github.com/Cryptite/Slice

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index c7229e120d601619d2ea869d7aa506fb3b78cde4..6fd345bfb43818e23d63bfe14328f0a54d212c5c 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -211,6 +211,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
     public final UUID uuid;
     public boolean hasPhysicsEvent = true; // Paper
     public boolean hasEntityMoveEvent = false; // Paper
+    public boolean instance; // Slice
     public static Throwable getAddToWorldStackTrace(Entity entity) {
         return new Throwable(entity + " Added to world at " + new java.util.Date());
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 5520b78f182e9e3281b12d6a2f93ce171e4b1151..b3347c4a80816b7c1910c50577d7a05bfd5835ea 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1200,6 +1200,18 @@ public class CraftWorld extends CraftRegionAccessor implements World {
         world.noSave = !value;
     }
 
+    // Slice start
+    @Override
+    public boolean isInstance() {
+        return world.instance;
+    }
+
+    @Override
+    public void setInstance(boolean value) {
+        world.instance = value;
+    }
+    // Slice end
+
     @Override
     public void setDifficulty(Difficulty difficulty) {
         this.getHandle().serverLevelData.setDifficulty(net.minecraft.world.Difficulty.byId(difficulty.getValue()));