Paper/Spigot-Server-Patches/0165-Move-setBlock-tile-tile-transition-workaround-into-T.patch

From f957e361a8f39e1145bc6d53e21dc74c74a43577 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Sat, 25 Jun 2016 23:55:56 -0500
Subject: [PATCH] Move setBlock tile->tile transition workaround into TE
 removal code and out of setblock

Works around an issue in which running it in setBlock for all block changes could cause sign (and other?) data corruption.
Also tells CB's TE fixer to ignore removals, as it would end up in a state in which it'd set the block, then
call TE removal, which would get the TE to remove, then making CB's fixer run and get confused as to the current state of
the block, but we don't care because that's the whole reason we're removing it.

diff --git a/src/main/java/net/minecraft/server/BlockChest.java b/src/main/java/net/minecraft/server/BlockChest.java
index a5f2fc0..ef525ea 100644
--- a/src/main/java/net/minecraft/server/BlockChest.java
+++ b/src/main/java/net/minecraft/server/BlockChest.java
@@ -288,7 +288,7 @@ public class BlockChest extends BlockTileEntity {
     }
 
     public void remove(World world, BlockPosition blockposition, IBlockData iblockdata) {
-        TileEntity tileentity = world.getTileEntity(blockposition);
+        TileEntity tileentity = world.getTileEntity(blockposition, true); // Paper - This is being removed, don't fix
 
         if (tileentity instanceof IInventory) {
             InventoryUtils.dropInventory(world, blockposition, (IInventory) tileentity);
diff --git a/src/main/java/net/minecraft/server/BlockDispenser.java b/src/main/java/net/minecraft/server/BlockDispenser.java
index 024ce36..c423663 100644
--- a/src/main/java/net/minecraft/server/BlockDispenser.java
+++ b/src/main/java/net/minecraft/server/BlockDispenser.java
@@ -144,7 +144,7 @@ public class BlockDispenser extends BlockTileEntity {
     }
 
     public void remove(World world, BlockPosition blockposition, IBlockData iblockdata) {
-        TileEntity tileentity = world.getTileEntity(blockposition);
+        TileEntity tileentity = world.getTileEntity(blockposition, true); // Paper - This is being removed, don't fix
 
         if (tileentity instanceof TileEntityDispenser) {
             InventoryUtils.dropInventory(world, blockposition, (TileEntityDispenser) tileentity);
diff --git a/src/main/java/net/minecraft/server/BlockFurnace.java b/src/main/java/net/minecraft/server/BlockFurnace.java
index 25f7b4b..898be91 100644
--- a/src/main/java/net/minecraft/server/BlockFurnace.java
+++ b/src/main/java/net/minecraft/server/BlockFurnace.java
@@ -109,7 +109,7 @@ public class BlockFurnace extends BlockTileEntity {
 
     public void remove(World world, BlockPosition blockposition, IBlockData iblockdata) {
         if (!BlockFurnace.c) {
-            TileEntity tileentity = world.getTileEntity(blockposition);
+            TileEntity tileentity = world.getTileEntity(blockposition, true); // Paper - This is being removed, don't fix
 
             if (tileentity instanceof TileEntityFurnace) {
                 InventoryUtils.dropInventory(world, blockposition, (TileEntityFurnace) tileentity);
diff --git a/src/main/java/net/minecraft/server/BlockSkull.java b/src/main/java/net/minecraft/server/BlockSkull.java
index 404793a..0d4d29b 100644
--- a/src/main/java/net/minecraft/server/BlockSkull.java
+++ b/src/main/java/net/minecraft/server/BlockSkull.java
@@ -122,7 +122,7 @@ public class BlockSkull extends BlockTileEntity {
             // if (!((Boolean) iblockdata.get(BlockSkull.NODROP)).booleanValue()) {
             if (false) {
                 // CraftBukkit end
-                TileEntity tileentity = world.getTileEntity(blockposition);
+                TileEntity tileentity = world.getTileEntity(blockposition, true); // Paper - This is being removed, don't fix
 
                 if (tileentity instanceof TileEntitySkull) {
                     TileEntitySkull tileentityskull = (TileEntitySkull) tileentity;
diff --git a/src/main/java/net/minecraft/server/BlockTileEntity.java b/src/main/java/net/minecraft/server/BlockTileEntity.java
index dfddafb..25c21b4 100644
--- a/src/main/java/net/minecraft/server/BlockTileEntity.java
+++ b/src/main/java/net/minecraft/server/BlockTileEntity.java
@@ -26,6 +26,7 @@ public abstract class BlockTileEntity extends Block implements ITileEntity {
     public void remove(World world, BlockPosition blockposition, IBlockData iblockdata) {
         super.remove(world, blockposition, iblockdata);
         world.s(blockposition);
+        world.setTypeAndData(blockposition, Blocks.AIR.getBlockData(), 0); // Paper - SPIGOT-611 workaround moved from setBlock
     }
 
     public boolean a(IBlockData iblockdata, World world, BlockPosition blockposition, int i, int j) {
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index f7d9a7c..383eef2 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -2071,8 +2071,14 @@ public abstract class World implements IBlockAccess {
     }
 
     public Map<BlockPosition, TileEntity> capturedTileEntities = Maps.newHashMap();
+    // Paper start - Add additional param so we can ignore fixing on removals
     @Nullable
     public TileEntity getTileEntity(BlockPosition blockposition) {
+        return getTileEntity(blockposition, false);
+    }
+
+    public TileEntity getTileEntity(BlockPosition blockposition, boolean isRemoving) {
+        // Paper end
         if (blockposition.isInvalidYLocation()) { // Paper
             return null;
         } else {
@@ -2149,7 +2155,7 @@ public abstract class World implements IBlockAccess {
     }
 
     public void s(BlockPosition blockposition) {
-        TileEntity tileentity = this.getTileEntity(blockposition);
+        TileEntity tileentity = this.getTileEntity(blockposition, true); // Paper - This is being removed, don't fix
 
         if (tileentity != null && this.M) {
             tileentity.y();
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 3377f97..269ae39 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -123,8 +123,16 @@ public class WorldServer extends World implements IAsyncTaskHandler {
 
     // CraftBukkit start
     @Override
+    // Paper start - Add additional param so we can ignore fixing on removals
     public TileEntity getTileEntity(BlockPosition pos) {
-        TileEntity result = super.getTileEntity(pos);
+        return getTileEntity(pos, false);
+    }
+
+    @Override
+    public TileEntity getTileEntity(BlockPosition pos, boolean isRemoving) {
+        TileEntity result = super.getTileEntity(pos, isRemoving);
+        if (isRemoving) return result;
+        // Paper end
         Block type = getType(pos).getBlock();
 
         if (type == Blocks.CHEST || type == Blocks.TRAPPED_CHEST) { // Spigot
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
index ed7e76f..a31475a 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
@@ -136,10 +136,14 @@ public class CraftBlock implements Block {
         IBlockData blockData = getNMSBlock(type).fromLegacyData(data);
         BlockPosition position = new BlockPosition(x, y, z);
 
+        // Paper start - Moved to TileEntity removal
+        /*
         // SPIGOT-611: need to do this to prevent glitchiness. Easier to handle this here (like /setblock) than to fix weirdness in tile entity cleanup
         if (type != 0) {
             chunk.getHandle().getWorld().setTypeAndData(position, Blocks.AIR.getBlockData(), 0);
         }
+        */
+        // Paper end
 
         if (applyPhysics) {
             return chunk.getHandle().getWorld().setTypeAndData(position, blockData, 3);
-- 
2.9.0.windows.1