From 40c1a13e6e107f3e86878c30efc65f75fd71c8a4 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/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index ffd2a26..bb8fe9c 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -967,25 +967,25 @@ public class Chunk {
 
     public void loadNearby(IChunkProvider ichunkprovider, ChunkGenerator chunkgenerator) {
         world.timings.syncChunkLoadPostTimer.startTiming(); // Spigot
-        Chunk chunk = ichunkprovider.getLoadedChunkAt(this.locX, this.locZ - 1);
-        Chunk chunk1 = ichunkprovider.getLoadedChunkAt(this.locX + 1, this.locZ);
-        Chunk chunk2 = ichunkprovider.getLoadedChunkAt(this.locX, this.locZ + 1);
-        Chunk chunk3 = ichunkprovider.getLoadedChunkAt(this.locX - 1, this.locZ);
+        Chunk chunk = MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX, this.locZ - 1); // Paper
+        Chunk chunk1 = MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX + 1, this.locZ); // Paper
+        Chunk chunk2 = MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX, this.locZ + 1); // Paper
+        Chunk chunk3 = MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX - 1, this.locZ); // Paper
 
-        if (chunk1 != null && chunk2 != null && ichunkprovider.getLoadedChunkAt(this.locX + 1, this.locZ + 1) != null) {
+        if (chunk1 != null && chunk2 != null && MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX + 1, this.locZ + 1) != null) { // Paper
             this.a(chunkgenerator);
         }
 
-        if (chunk3 != null && chunk2 != null && ichunkprovider.getLoadedChunkAt(this.locX - 1, this.locZ + 1) != null) {
+        if (chunk3 != null && chunk2 != null && MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX - 1, this.locZ + 1) != null) { // Paper
             chunk3.a(chunkgenerator);
         }
 
-        if (chunk != null && chunk1 != null && ichunkprovider.getLoadedChunkAt(this.locX + 1, this.locZ - 1) != null) {
+        if (chunk != null && chunk1 != null && MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX + 1, this.locZ - 1) != null) { // Paper
             chunk.a(chunkgenerator);
         }
 
         if (chunk != null && chunk3 != null) {
-            Chunk chunk4 = ichunkprovider.getLoadedChunkAt(this.locX - 1, this.locZ - 1);
+            Chunk chunk4 = MCUtil.getLoadedChunkWithoutMarkingActive(ichunkprovider,this.locX - 1, this.locZ - 1); // Paper
 
             if (chunk4 != null) {
                 chunk4.a(chunkgenerator);
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index f8905b4..6d1b98b 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -203,7 +203,7 @@ public class ChunkProviderServer implements IChunkProvider {
                         continue;
                     }
 
-                    Chunk neighbor = this.getChunkIfLoaded(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);
@@ -324,7 +324,7 @@ public class ChunkProviderServer implements IChunkProvider {
                                     continue;
                                 }
 
-                                Chunk neighbor = this.getChunkIfLoaded(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 d822cb1..9335cef 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().getChunkIfLoaded(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);
-- 
2.8.3