From 97ab3dbce9bd88f8593e8cb5f1f01a1c9866fd72 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 24 Jan 2018 20:06:39 -0500
Subject: [PATCH] MC-99321 - Dont check for blocked double chest for hoppers
 etc

This is a source of MAJOR lag for hoppers, as well as a gameplay bug.

This removes the necessity to disable the cat on chest behavior to improve performance.

now performance will be improved even if you have cat chest detection on.

diff --git a/src/main/java/net/minecraft/server/BlockChest.java b/src/main/java/net/minecraft/server/BlockChest.java
index 633c75ffe..68cdd3970 100644
--- a/src/main/java/net/minecraft/server/BlockChest.java
+++ b/src/main/java/net/minecraft/server/BlockChest.java
@@ -208,6 +208,7 @@ public class BlockChest extends BlockTileEntity implements IFluidSource, IFluidC
 
                     if (blockpropertychesttype1 != BlockPropertyChestType.SINGLE && blockpropertychesttype != blockpropertychesttype1 && iblockdata1.get(BlockChest.FACING) == iblockdata.get(BlockChest.FACING)) {
                         if (!flag && this.a(world, blockposition1)) {
+                        //if (!flag && this.e(world, blockposition1)) { // Paper - check for allowBlocked flag - MC-99321
                             return null;
                         }
 
-- 
2.18.0