Paper/patches/server/0918-Fix-CraftMetaItem-getAttributeModifier-duplication-c.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: hyper1423 <backup8822@gmail.com>
Date: Sun, 3 Dec 2023 07:38:09 +0900
Subject: [PATCH] Fix CraftMetaItem#getAttributeModifier duplication check


diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index 24ebc5841ed16129c0e9305da6cf1d8fb67d42ec..529e20fcbf0e7ba22a3f0e7a60ae540c21fed424 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -1405,7 +1405,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         Preconditions.checkNotNull(modifier, "AttributeModifier cannot be null");
         this.checkAttributeList();
         for (Map.Entry<Attribute, AttributeModifier> entry : this.attributeModifiers.entries()) {
-            Preconditions.checkArgument(!entry.getValue().getKey().equals(modifier.getKey()), "Cannot register AttributeModifier. Modifier is already applied! %s", modifier);
+            Preconditions.checkArgument(!entry.getValue().getKey().equals(modifier.getKey()) && entry.getKey() == attribute, "Cannot register AttributeModifier. Modifier is already applied! %s", modifier); // Paper - attribute modifiers with same namespaced key but on different attributes are fine
         }
         return this.attributeModifiers.put(attribute, modifier);
     }