PaperMC/patches/server/0852-EntityPickupItemEvent-fixes.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Mon, 4 Jul 2022 21:45:36 -0700
Subject: [PATCH] EntityPickupItemEvent fixes

Fixes double firing of the event in PiglinAi

Fixes cancelling the event for piglins still triggering the
advancement trigger

Fires the event when a Raider tries to pick up a raid banner
to become raid leader.

diff --git a/src/main/java/net/minecraft/world/entity/monster/piglin/Piglin.java b/src/main/java/net/minecraft/world/entity/monster/piglin/Piglin.java
index 1c42425b9211bea7cb189e967e566ad80fd278c2..6407ddef8442fce4f310ac4babf3e3de0dd5fc9a 100644
--- a/src/main/java/net/minecraft/world/entity/monster/piglin/Piglin.java
+++ b/src/main/java/net/minecraft/world/entity/monster/piglin/Piglin.java
@@ -424,7 +424,7 @@ public class Piglin extends AbstractPiglin implements CrossbowAttackMob, Invento
 
     @Override
     protected void pickUpItem(ItemEntity item) {
-        this.onItemPickup(item);
+        // this.onItemPickup(item); // Paper - call in PiglinAi#pickUpItem after EntityPickupItemEvent is fired
         PiglinAi.pickUpItem(this, item);
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/monster/piglin/PiglinAi.java b/src/main/java/net/minecraft/world/entity/monster/piglin/PiglinAi.java
index f0059bd69705ecc7964867b103c93e1df9985803..372d084609216d5437b92ee60810a9efbb0b6f31 100644
--- a/src/main/java/net/minecraft/world/entity/monster/piglin/PiglinAi.java
+++ b/src/main/java/net/minecraft/world/entity/monster/piglin/PiglinAi.java
@@ -241,11 +241,16 @@ public class PiglinAi {
         ItemStack itemstack;
 
         // CraftBukkit start
-        if (drop.getItem().is(Items.GOLD_NUGGET) && !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(piglin, drop, 0, false).isCancelled()) {
+        // Paper start - fix event firing twice
+        if (drop.getItem().is(Items.GOLD_NUGGET) /* && !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(piglin, drop, 0, false).isCancelled() */) {
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(piglin, drop, 0, false).isCancelled()) return;
+            piglin.onItemPickup(drop); // Paper - moved from Piglin#pickUpItem - call prior to item entity modification
+            // Paper end
             piglin.take(drop, drop.getItem().getCount());
             itemstack = drop.getItem();
             drop.discard();
         } else if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(piglin, drop, drop.getItem().getCount() - 1, false).isCancelled()) {
+            piglin.onItemPickup(drop); // Paper - moved from Piglin#pickUpItem - call prior to item entity modification
             piglin.take(drop, 1);
             itemstack = PiglinAi.removeOneItemFromItemEntity(drop);
         } else {
diff --git a/src/main/java/net/minecraft/world/entity/raid/Raider.java b/src/main/java/net/minecraft/world/entity/raid/Raider.java
index 5538f7a9024d8708b70de836aa78a4015656a828..cdbc925ef61b8b439415f0a89368227890bcecb2 100644
--- a/src/main/java/net/minecraft/world/entity/raid/Raider.java
+++ b/src/main/java/net/minecraft/world/entity/raid/Raider.java
@@ -245,6 +245,11 @@ public abstract class Raider extends PatrollingMonster {
         boolean flag = this.hasActiveRaid() && this.getCurrentRaid().getLeader(this.getWave()) != null;
 
         if (this.hasActiveRaid() && !flag && ItemStack.matches(itemstack, Raid.getLeaderBannerInstance())) {
+            // Paper start
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(this, item, 0, false).isCancelled()) {
+                return;
+            }
+            // Paper end
             EquipmentSlot enumitemslot = EquipmentSlot.HEAD;
             ItemStack itemstack1 = this.getItemBySlot(enumitemslot);
             double d0 = (double) this.getEquipmentDropChance(enumitemslot);