SPIGOT-4493: Allow burnt out furnaces to remain lit like Vanilla whilst retaining SPIGOT-844 API

nms-patches/TileEntityFurnace.patch

@@ -48,15 +48,6 @@
      public TileEntityFurnace() {
          super(TileEntityTypes.FURNACE);
          this.items = NonNullList.a(3, ItemStack.a);
-@@ -219,7 +253,7 @@
-     }
- 
-     public void tick() {
--        boolean flag = this.isBurning();
-+        boolean flag = this.getBlock().get(BlockFurnace.LIT); // CraftBukkit - SPIGOT-844 - Check if furnace block is lit using the block instead of burn time
-         boolean flag1 = false;
- 
-         if (this.isBurning()) {
 @@ -237,9 +271,20 @@
                  IRecipe irecipe = this.world.getCraftingManager().b(this, this.world);
  
@@ -80,15 +71,7 @@
                          flag1 = true;
                          if (!itemstack.isEmpty()) {
                              Item item = itemstack.getItem();
-@@ -270,6 +315,7 @@
+@@ -280,7 +325,7 @@
-             if (flag != this.isBurning()) {
-                 flag1 = true;
-                 this.world.setTypeAndData(this.position, (IBlockData) this.world.getType(this.position).set(BlockFurnace.LIT, this.isBurning()), 3);
-+                this.invalidateBlockCache(); // CraftBukkit - Invalidate tile entity's cached block type
-             }
-         }
- 
-@@ -280,7 +326,7 @@
      }
  
      private int s() {
@@ -97,7 +80,7 @@
  
          return furnacerecipe != null ? furnacerecipe.h() : 200;
      }
-@@ -307,11 +353,38 @@
+@@ -307,11 +352,38 @@
              ItemStack itemstack1 = irecipe.d();
              ItemStack itemstack2 = (ItemStack) this.items.get(2);
  

src/main/java/org/bukkit/craftbukkit/block/CraftFurnace.java

@@ -1,5 +1,6 @@
 package org.bukkit.craftbukkit.block;
 
+import net.minecraft.server.BlockFurnace;
 import net.minecraft.server.TileEntityFurnace;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
@@ -40,6 +41,8 @@ public class CraftFurnace extends CraftContainer<TileEntityFurnace> implements F
     @Override
     public void setBurnTime(short burnTime) {
         this.getSnapshot().setProperty(0, burnTime);
+        // SPIGOT-844: Allow lighting and relighting using this API
+        this.data = this.data.set(BlockFurnace.LIT, burnTime > 0);
     }
 
     @Override