From 9df0a1beae6afe76606eb96db443a735faf77eba Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 12 May 2016 01:55:17 -0400
Subject: [PATCH] Do not mark chunks as active for neighbor updates

Fixes chunk unload issues

diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 8ee8e80..1bc001d 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -197,7 +197,7 @@ public class ChunkProviderServer implements IChunkProvider {
                         continue;
                     }
 
-                    Chunk neighbor = this.getLoadedChunkAt(chunk.locX + x, chunk.locZ + z);
+                    Chunk neighbor = MCUtil.getLoadedChunkWithoutMarkingActive(this, chunk.locX + x, chunk.locZ + z); // Paper
                     if (neighbor != null) {
                         neighbor.setNeighborLoaded(-x, -z);
                         chunk.setNeighborLoaded(x, z);
@@ -318,7 +318,7 @@ public class ChunkProviderServer implements IChunkProvider {
                                     continue;
                                 }
 
-                                Chunk neighbor = this.chunks.get(ChunkCoordIntPair.a(chunk.locX + x, chunk.locZ + z));
+                                Chunk neighbor = MCUtil.getLoadedChunkWithoutMarkingActive(this, chunk.locX + x, chunk.locZ + z); // Paper
                                 if (neighbor != null) {
                                     neighbor.setNeighborUnloaded(-x, -z);
                                     chunk.setNeighborUnloaded(x, z);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 1adfc03..b1a7435 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -241,7 +241,7 @@ public class CraftWorld implements World {
                     continue;
                 }
 
-                net.minecraft.server.Chunk neighbor = world.getChunkProviderServer().getLoadedChunkAt(chunk.locX + x, chunk.locZ + z);
+                net.minecraft.server.Chunk neighbor = net.minecraft.server.MCUtil.getLoadedChunkWithoutMarkingActive(world, chunk.locX + x, chunk.locZ + z); // Paper
                 if (neighbor != null) {
                     neighbor.setNeighborUnloaded(-xx, -zz);
                     chunk.setNeighborUnloaded(xx, zz);
@@ -328,7 +328,7 @@ public class CraftWorld implements World {
                         continue;
                     }
 
-                    net.minecraft.server.Chunk neighbor = world.getChunkProviderServer().getLoadedChunkAt(chunk.locX + x, chunk.locZ + z);
+                    net.minecraft.server.Chunk neighbor = net.minecraft.server.MCUtil.getLoadedChunkWithoutMarkingActive(world, chunk.locX + x, chunk.locZ + z); // Paper
                     if (neighbor != null) {
                         neighbor.setNeighborLoaded(-x, -z);
                         chunk.setNeighborLoaded(x, z);
diff --git a/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java b/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
index 7b61b14..7752b50 100644
--- a/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
+++ b/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
@@ -5,7 +5,6 @@ import net.minecraft.server.Chunk;
 import net.minecraft.server.ChunkCoordIntPair;
 import net.minecraft.server.ChunkRegionLoader;
 import net.minecraft.server.NBTTagCompound;
-
 import org.bukkit.Server;
 import org.bukkit.craftbukkit.util.AsynchronousExecutor;
 
@@ -62,7 +61,7 @@ class ChunkIOProvider implements AsynchronousExecutor.CallBackProvider<QueuedChu
                     continue;
                 }
 
-                Chunk neighbor = queuedChunk.provider.getLoadedChunkAt(chunk.locX + x, chunk.locZ + z);
+                Chunk neighbor = net.minecraft.server.MCUtil.getLoadedChunkWithoutMarkingActive(queuedChunk.provider, chunk.locX + x, chunk.locZ + z); // Paper
                 if (neighbor != null) {
                     neighbor.setNeighborLoaded(-x, -z);
                     chunk.setNeighborLoaded(x, z);
-- 
2.8.2