PaperMC/nms-patches/ItemArmor.patch

--- a/net/minecraft/server/ItemArmor.java
+++ b/net/minecraft/server/ItemArmor.java
@@ -3,6 +3,11 @@
 import com.google.common.base.Predicates;
 import java.util.List;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.block.BlockDispenseEvent;
+// CraftBukkit end
+
 public class ItemArmor extends Item {
 
     private static final int[] k = new int[] { 11, 16, 15, 13};
@@ -20,7 +25,34 @@
                 EntityLiving entityliving = (EntityLiving) list.get(0);
                 int l = entityliving instanceof EntityHuman ? 1 : 0;
                 int i1 = EntityInsentient.c(itemstack);
-                ItemStack itemstack1 = itemstack.cloneItemStack();
+
+                // CraftBukkit start
+                ItemStack itemstack1 = itemstack.cloneAndSubtract(1);
+                World world = isourceblock.getWorld();
+                org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockPosition().getX(), isourceblock.getBlockPosition().getY(), isourceblock.getBlockPosition().getZ());
+                CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
+
+                BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(0, 0, 0));
+                if (!BlockDispenser.eventFired) {
+                    world.getServer().getPluginManager().callEvent(event);
+                }
+
+                if (event.isCancelled()) {
+                    itemstack.count++;
+                    return itemstack;
+                }
+
+                if (!event.getItem().equals(craftItem)) {
+                    itemstack.count++;
+                    // Chain to handler for new item
+                    ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
+                    IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.REGISTRY.get(eventStack.getItem());
+                    if (idispensebehavior != IDispenseBehavior.NONE && idispensebehavior != this) {
+                        idispensebehavior.a(isourceblock, eventStack);
+                        return itemstack;
+                    }
+                }
+                // CraftBukkit end
 
                 itemstack1.count = 1;
                 entityliving.setEquipment(i1 - l, itemstack1);
@@ -28,7 +60,7 @@
                     ((EntityInsentient) entityliving).a(i1, 2.0F);
                 }
 
-                --itemstack.count;
+                // --itemstack.count; // CraftBukkit - handled above
                 return itemstack;
             } else {
                 return super.b(isourceblock, itemstack);