From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 20 May 2021 22:16:37 -0700
Subject: [PATCH] Fix PlayerBucketEmptyEvent result itemstack

Fixes SPIGOT-2560: https://hub.spigotmc.org/jira/projects/SPIGOT/issues/SPIGOT-2560

diff --git a/src/main/java/net/minecraft/world/item/BucketItem.java b/src/main/java/net/minecraft/world/item/BucketItem.java
index d0e847e58483695d2af1c1410826bb25231cd6f6..08c00a084b2972420eae020e13480489b29aec64 100644
--- a/src/main/java/net/minecraft/world/item/BucketItem.java
+++ b/src/main/java/net/minecraft/world/item/BucketItem.java
@@ -116,6 +116,13 @@ public class BucketItem extends Item {
     }
 
     protected ItemStack getEmptySuccessItem(ItemStack stack, Player player) {
+        // Paper
+        if (itemLeftInHandAfterPlayerBucketEmptyEvent != null) {
+            ItemStack itemInHand = itemLeftInHandAfterPlayerBucketEmptyEvent;
+            itemLeftInHandAfterPlayerBucketEmptyEvent = null;
+            return itemInHand;
+        }
+        // Paper
         return !player.abilities.instabuild ? new ItemStack(Items.BUCKET) : stack;
     }
 
@@ -126,6 +133,7 @@ public class BucketItem extends Item {
         return a(player, world, pos, movingobjectpositionblock, null, null, null, null);
     }
 
+    private ItemStack itemLeftInHandAfterPlayerBucketEmptyEvent = null; // Paper
     public boolean a(Player entityhuman, Level world, BlockPos blockposition, @Nullable BlockHitResult movingobjectpositionblock, Direction enumdirection, BlockPos clicked, ItemStack itemstack, InteractionHand enumhand) {
         // Paper end
         // CraftBukkit end
@@ -146,6 +154,9 @@ public class BucketItem extends Item {
                     ((ServerPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-4541
                     return false;
                 }
+                // Paper start
+                itemLeftInHandAfterPlayerBucketEmptyEvent = event.getItemStack().equals(CraftItemStack.asNewCraftStack(net.minecraft.world.item.Items.BUCKET)) ? null : CraftItemStack.asNMSCopy(event.getItemStack());
+                // Paper end
             }
             // CraftBukkit end
             if (!flag1) {