PaperMC/Spigot-Server-Patches/0751-Reset-villager-inventory-on-cancelled-pickup-event.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <blake.galbreath@gmail.com>
Date: Fri, 28 May 2021 06:48:48 -0500
Subject: [PATCH] Reset villager inventory on cancelled pickup event


diff --git a/src/main/java/net/minecraft/world/InventorySubcontainer.java b/src/main/java/net/minecraft/world/InventorySubcontainer.java
index 760e61167a053b9df73823600561ddb0cf3ff2c7..4a30630ca7596f95c9dd871e5bc1e2e1ea8abc08 100644
--- a/src/main/java/net/minecraft/world/InventorySubcontainer.java
+++ b/src/main/java/net/minecraft/world/InventorySubcontainer.java
@@ -34,6 +34,16 @@ public class InventorySubcontainer implements IInventory, AutoRecipeOutput {
         return this.items;
     }
 
+    // Paper start
+    public void setContents(List<ItemStack> items) {
+        this.items.clear();
+        for(int i = 0; i < items.size(); i++) {
+            this.items.set(i, items.get(i));
+        }
+        this.update();
+    }
+    // Paper end
+
     public void onOpen(CraftHumanEntity who) {
         transaction.add(who);
     }
diff --git a/src/main/java/net/minecraft/world/entity/npc/EntityVillager.java b/src/main/java/net/minecraft/world/entity/npc/EntityVillager.java
index 3f081177814dc874047e35e294ed18609f082d76..9278b8546a57f21051a65d59c2c01d39afaa68cc 100644
--- a/src/main/java/net/minecraft/world/entity/npc/EntityVillager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/EntityVillager.java
@@ -845,8 +845,10 @@ public class EntityVillager extends EntityVillagerAbstract implements Reputation
             }
 
             // CraftBukkit start
+            List<ItemStack> contentsSnapshot = new java.util.ArrayList<>(inventorysubcontainer.getContents()); // Paper
             ItemStack itemstack1 = inventorysubcontainer.a(itemstack);
             if (CraftEventFactory.callEntityPickupItemEvent(this, entityitem, itemstack1.getCount(), false).isCancelled()) {
+                inventorysubcontainer.setContents(contentsSnapshot); // Paper
                 return;
             }
             // CraftBukkit end