Process NMS Data Conversion post ItemMeta on Copy

ItemMeta apply is a destructive process that expects to be the authority on
what the items NBT data is.

When CraftItemStack.asNMSCopy was called, the conversion ran, potentially setting
the converted data into the ItemStacks tag.

Then if that item had ItemMeta, it would completely undo that conversion by
erasing the NBT Tag.

On copy, run conversion post ItemMeta apply.

Spigot-Server-Patches/0174-Process-NMS-Data-Conversion-post-ItemMeta-on-Copy.patch

@@ -0,0 +1,65 @@
+From 1db407564fbdd4f31b348c62f11b15be0eb27c7c Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Wed, 4 May 2016 22:31:18 -0400
+Subject: [PATCH] Process NMS Data Conversion post ItemMeta on Copy
+
+ItemMeta apply is a destructive process that expects to be the authority on
+what the items NBT data is.
+
+When CraftItemStack.asNMSCopy was called, the conversion ran, potentially setting
+the converted data into the ItemStacks tag.
+
+Then if that item had ItemMeta, it would completely undo that conversion by
+erasing the NBT Tag.
+
+On copy, run conversion post ItemMeta apply.
+
+diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
+index d45a9ec..a8874d2 100644
+--- a/src/main/java/net/minecraft/server/ItemStack.java
++++ b/src/main/java/net/minecraft/server/ItemStack.java
+@@ -53,7 +53,12 @@ public final class ItemStack {
+         this(item, i, 0);
+     }
+ 
++    // Paper start
+     public ItemStack(Item item, int i, int j) {
++        this(item, i, j, true);
++    }
++    public ItemStack(Item item, int i, int j, boolean convert) {
++        // Paper end
+         this.item = item;
+         this.count = i;
+ 
+@@ -63,6 +68,11 @@ public final class ItemStack {
+         //if (this.damage < 0) {
+         //    this.damage = 0;
+         //}
++        // Paper start
++        if (convert) convertData();
++    }
++    public final void convertData() {
++        // Paper end
+         if (MinecraftServer.getServer() != null) {
+             NBTTagCompound savedStack = new NBTTagCompound();
+             this.save(savedStack);
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+index 88f0292..7f77d44 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+@@ -45,10 +45,11 @@ public final class CraftItemStack extends ItemStack {
+             return null;
+         }
+ 
+-        net.minecraft.server.ItemStack stack = new net.minecraft.server.ItemStack(item, original.getAmount(), original.getDurability());
++        net.minecraft.server.ItemStack stack = new net.minecraft.server.ItemStack(item, original.getAmount(), original.getDurability(), false); // Paper
+         if (original.hasItemMeta()) {
+             setItemMeta(stack, original.getItemMeta());
+         }
++        stack.convertData(); // Paper
+         return stack;
+     }
+ 
+-- 
+2.9.3
+