From 5c23262f159f3c7a927299be0f26df11486e2ac2 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Sat, 9 Apr 2016 12:57:19 +1000
Subject: [PATCH] Update physics on attached block when setting data of
 attachable blocks

---
 .../bukkit/craftbukkit/block/CraftBlockState.java | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java
index 7da6218b7c..3261f24961 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockState.java
@@ -3,6 +3,7 @@ package org.bukkit.craftbukkit.block;
 import net.minecraft.server.BlockPosition;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
 import org.bukkit.Chunk;
 import org.bukkit.Material;
 import org.bukkit.World;
@@ -10,11 +11,14 @@ import org.bukkit.block.BlockState;
 import org.bukkit.craftbukkit.CraftChunk;
 import org.bukkit.craftbukkit.CraftWorld;
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.material.Attachable;
 import org.bukkit.material.MaterialData;
 import org.bukkit.metadata.MetadataValue;
 import org.bukkit.plugin.Plugin;
 
 import java.util.List;
+import net.minecraft.server.EnumDirection;
+import net.minecraft.server.IBlockData;
 import net.minecraft.server.TileEntity;
 
 public class CraftBlockState implements BlockState {
@@ -159,14 +163,21 @@ public class CraftBlockState implements BlockState {
             }
         }
 
+        BlockPosition pos = new BlockPosition(x, y, z);
+        IBlockData newBlock = CraftMagicNumbers.getBlock(getType()).fromLegacyData(getRawData());
         block.setTypeIdAndData(getTypeId(), getRawData(), applyPhysics);
         world.getHandle().notify(
-                new BlockPosition(x, y, z),
+                pos,
                 CraftMagicNumbers.getBlock(block).fromLegacyData(block.getData()),
-                CraftMagicNumbers.getBlock(getType()).fromLegacyData(getRawData()),
+                newBlock,
                 3
         );
 
+        // Update levers etc
+        if (applyPhysics && getData() instanceof Attachable) {
+            world.getHandle().applyPhysics(pos.shift(CraftBlock.blockFaceToNotch(((Attachable) getData()).getAttachedFace())), newBlock.getBlock());
+        }
+
         return true;
     }