From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: kickash32 <kickash32@gmail.com>
Date: Mon, 19 Aug 2019 19:42:35 +0500
Subject: [PATCH] Prevent consuming the wrong itemstack


diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 472b8db386dfb580734999900562d358e5ea146a..55ac5e8cad4c7eee3d8b165698200e9afcd44594 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3554,15 +3554,18 @@ public abstract class LivingEntity extends Entity {
         this.entityData.set(LivingEntity.DATA_LIVING_ENTITY_FLAGS, (byte) j);
     }
 
-    public void startUsingItem(InteractionHand hand) {
-        ItemStack itemstack = this.getItemInHand(hand);
+    // Paper start -- OBFHELPER and forwarder to method with forceUpdate parameter
+    public void startUsingItem(InteractionHand hand) { this.updateActiveItem(hand, false); }
+    public void updateActiveItem(InteractionHand enumhand, boolean forceUpdate) {
+    // Paper end
+        ItemStack itemstack = this.getItemInHand(enumhand);
 
-        if (!itemstack.isEmpty() && !this.isUsingItem()) {
+        if (!itemstack.isEmpty() && !this.isUsingItem() || forceUpdate) { // Paper use override flag
             this.useItem = itemstack;
             this.useItemRemaining = itemstack.getUseDuration();
             if (!this.level.isClientSide) {
                 this.setLivingEntityFlag(1, true);
-                this.setLivingEntityFlag(2, hand == InteractionHand.OFF_HAND);
+                this.setLivingEntityFlag(2, enumhand == InteractionHand.OFF_HAND);
             }
 
         }
@@ -3635,6 +3638,7 @@ public abstract class LivingEntity extends Entity {
             this.releaseUsingItem();
         } else {
             if (!this.useItem.isEmpty() && this.isUsingItem()) {
+                this.updateActiveItem(this.getUsedItemHand(), true); // Paper
                 this.triggerItemUseEffects(this.useItem, 16);
                 // CraftBukkit start - fire PlayerItemConsumeEvent
                 ItemStack itemstack;
@@ -3669,8 +3673,8 @@ public abstract class LivingEntity extends Entity {
                 }
 
                 this.stopUsingItem();
-                // Paper start - if the replacement is anything but the default, update the client inventory
-                if (this instanceof ServerPlayer && !com.google.common.base.Objects.equal(defaultReplacement, itemstack)) {
+                // Paper start
+                if (this instanceof ServerPlayer) {
                     ((ServerPlayer) this).getBukkitEntity().updateInventory();
                 }
                 // Paper end