Paper/patches/server/0991-Allow-proper-checking-of-empty-item-stacks.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aeltumn <daniel@goossens.ch>
Date: Mon, 28 Aug 2023 13:44:09 +0200
Subject: [PATCH] Allow proper checking of empty item stacks


diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index d1604c52784c1bf94e797ca1f5d8146c19314c11..414a67096478ca57be54bd2ce565e7d50c8dd100 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -33,12 +33,19 @@ public final class CraftItemStack extends ItemStack {
     }
     // Paper end - MC Utils
 
+    // Paper start - override isEmpty to use vanilla's impl
+    @Override
+    public boolean isEmpty() {
+        return handle == null || handle.isEmpty();
+    }
+    // Paper end - override isEmpty to use vanilla's impl
+
     public static net.minecraft.world.item.ItemStack asNMSCopy(ItemStack original) {
         if (original instanceof CraftItemStack) {
             CraftItemStack stack = (CraftItemStack) original;
             return stack.handle == null ? net.minecraft.world.item.ItemStack.EMPTY : stack.handle.copy();
         }
-        if (original == null || original.getType() == Material.AIR) {
+        if (original == null || original.isEmpty()) { // Paper - override isEmpty to use vanilla's impl; use isEmpty
             return net.minecraft.world.item.ItemStack.EMPTY;
         }