From d8ba17b1464eb0fe35132f092a972c8b97adeeb1 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 15 Dec 2017 15:52:28 -0500
Subject: [PATCH] Fix cloning banner itemstacks

the banner meta would end up with a shared reference to the patterns

diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBanner.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBanner.java
index aa1a210a2..3ae4604f0 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBanner.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBanner.java
@@ -200,4 +200,14 @@ public class CraftMetaBanner extends CraftMetaItem implements BannerMeta {
     boolean applicableTo(Material type) {
         return type == Material.BANNER;
     }
+
+    // Paper start
+    @Override
+    public CraftMetaBanner clone() {
+        CraftMetaBanner clone = (CraftMetaBanner) super.clone();
+        clone.base = this.base;
+        clone.patterns = new ArrayList<>(this.patterns);
+        return clone;
+    }
+    // Paper end
 }
-- 
2.15.1