Fix dupe with Eigencraft redstone implementation (#2864)

Spigot-Server-Patches/0331-Optimize-redstone-algorithm.patch

@@ -1,4 +1,4 @@
-From 9382064df0fb23829f26cfa668d948625c046239 Mon Sep 17 00:00:00 2001
+From 7300336b4ea331e4d37eabd94f391e90cdd03804 Mon Sep 17 00:00:00 2001
 From: theosib <millerti@172.16.221.1>
 Date: Thu, 27 Sep 2018 01:43:35 -0600
 Subject: [PATCH] Optimize redstone algorithm
@@ -39,10 +39,10 @@ index dd5e263d7..357c7cf1d 100644
  }
 diff --git a/src/main/java/com/destroystokyo/paper/util/RedstoneWireTurbo.java b/src/main/java/com/destroystokyo/paper/util/RedstoneWireTurbo.java
 new file mode 100644
-index 000000000..cf5661f1c
+index 000000000..b69803cbf
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/util/RedstoneWireTurbo.java
-@@ -0,0 +1,912 @@
+@@ -0,0 +1,915 @@
 +package com.destroystokyo.paper.util;
 +
 +import java.util.List;
@@ -938,8 +938,11 @@ index 000000000..cf5661f1c
 +            // and set it in the world.
 +            // Possible optimization:  Don't commit state changes to the world until they
 +            // need to be known by some nearby non-redstone-wire block.
-+            state = state.set(BlockRedstoneWire.POWER, Integer.valueOf(j));
-+            worldIn.setTypeAndData(upd.self, state, 2);
++            BlockPosition pos = new BlockPosition(upd.self.getX(), upd.self.getY(), upd.self.getZ());
++            if (wire.canPlace(null, worldIn, pos)) {
++                state = state.set(BlockRedstoneWire.POWER, Integer.valueOf(j));
++                worldIn.setTypeAndData(upd.self, state, 2);
++            }
 +        }
 +
 +        return state;