Paper/patches/server/0875-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 7ef04ef7995b093eef022b397cda8c27c8faede0..27d9145693a772cd1b5d171da303c934101f3be8 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
@@ -429,7 +429,7 @@ 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 5f2bb0160c49d404a06551880e08c589a5b2a0a7..d98c526676202741e628d5e317b8cdd3f4d3be0a 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
@@ -241,7 +241,10 @@ 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;
+            // Paper end
             piglin.take(drop, drop.getItem().getCount());
             itemstack = drop.getItem();
             drop.discard();
@@ -251,6 +254,7 @@ public class PiglinAi {
         } else {
             return;
         }
+        piglin.onItemPickup(drop); // Paper - moved from Piglin#pickUpItem
         // CraftBukkit end
 
         if (PiglinAi.isLovedItem(itemstack, piglin)) { // CraftBukkit - Changes to allow for custom payment in bartering
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 9948085f51659f9b896622251739343d658dd0b2..57fdcdaf54fd1c92a6e51a3a81789029096e5abe 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);