SPIGOT-844: Use actual block when deciding to send visual updates for burning furnaces.

nms-patches/TileEntityFurnace.patch

@@ -1,5 +1,5 @@
---- /home/matt/mc-dev-private//net/minecraft/server/TileEntityFurnace.java	2015-02-26 22:40:23.143608133 +0000
-+++ src/main/java/net/minecraft/server/TileEntityFurnace.java	2015-02-26 22:40:23.143608133 +0000
+--- ../work/decompile-c2c33c10/net/minecraft/server/TileEntityFurnace.java	2015-05-21 17:23:15.279886524 +1000
++++ src/main/java/net/minecraft/server/TileEntityFurnace.java	2015-05-21 17:23:15.283886599 +1000
 @@ -1,17 +1,53 @@
  package net.minecraft.server;
  
@@ -65,8 +65,12 @@
      }
  
      public boolean isBurning() {
-@@ -143,8 +179,26 @@
-         boolean flag = this.isBurning();
+@@ -140,11 +176,29 @@
+     }
+ 
+     public void c() {
+-        boolean flag = this.isBurning();
++        boolean flag = (this.w() == Blocks.LIT_FURNACE); // CraftBukkit - SPIGOT-844 - Check if furnace block is lit using the block instead of burn time
          boolean flag1 = false;
  
 +        // CraftBukkit start - Use wall time instead of ticks for cooking