Paper/patches/server/0794-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 ea0902b4ba68a89b1f51281b10c1dfd1bfb42833..a9813da7f2b248f98f22e0ad2e7842915025ec12 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 - EntityPickupItemEvent fixes; 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 2a3bdf7cd8207732983d033c1301fa051df5b126..4f4f557b7f4232ec3b90dda43c6bed30521318ba 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
@@ -242,11 +242,16 @@ 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 - EntityPickupItemEvent fixes; 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 - EntityPickupItemEvent fixes
             piglin.take(drop, drop.getItem().getCount());
             itemstack = drop.getItem();
             drop.discard(EntityRemoveEvent.Cause.PICKUP); // CraftBukkit - add Bukkit remove cause
         } else if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(piglin, drop, drop.getItem().getCount() - 1, false).isCancelled()) {
+            piglin.onItemPickup(drop); // Paper - EntityPickupItemEvent fixes; 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 d783b4d561e252af8928e4b1ea13c4e61598f8bf..93bbf7556f9599e9dd90761085a57d78bd521867 100644
--- a/src/main/java/net/minecraft/world/entity/raid/Raider.java
+++ b/src/main/java/net/minecraft/world/entity/raid/Raider.java
@@ -248,6 +248,11 @@ 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 - EntityPickupItemEvent fixes
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPickupItemEvent(this, item, 0, false).isCancelled()) {
+                return;
+            }
+            // Paper end - EntityPickupItemEvent fixes
             EquipmentSlot enumitemslot = EquipmentSlot.HEAD;
             ItemStack itemstack1 = this.getItemBySlot(enumitemslot);
             double d0 = (double) this.getEquipmentDropChance(enumitemslot);