PaperMC/patches/unapplied/server/0862-Fix-slot-desync.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 23 Aug 2023 13:22:09 -0700
Subject: [PATCH] Fix slot desync

General patch fixing slot desyncs between the server and client that
result from cancelled events/paper introduced logic.

Co-authored-by: Minecrell <minecrell@minecrell.net>
Co-authored-by: Newwind <support@newwindserver.com>

diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index df2c899988429cb68b0abbb829d378e6a2ed022b..0c5e67db809a9d741cb27d97d42dd9e71fda44eb 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -460,6 +460,7 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player {
 
     // Use method to resend items in hands in case of client desync, because the item use got cancelled.
     // For example, when cancelling the leash event
+    @Deprecated // Paper - this shouldn't be used, use the regular sendAllDataToRemote call to resync all
     public void resendItemInHands() {
         this.containerMenu.findSlot(this.getInventory(), this.getInventory().selected).ifPresent(s -> {
             this.containerSynchronizer.sendSlotChange(this.containerMenu, s, this.getMainHandItem());
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 38730e11118bf71d167a18b807e06c20ea0d63d0..5be7304c8417e2987837d1c6ce8b80231fd29c51 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2747,10 +2747,11 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                                 // Refresh the current entity metadata
                                 entity.refreshEntityData(ServerGamePacketListenerImpl.this.player);
                                 // SPIGOT-7136 - Allays
-                                if (entity instanceof Allay) {
+                                if (entity instanceof Allay || entity instanceof net.minecraft.world.entity.animal.horse.AbstractHorse) { // Paper - Fix horse armor desync
                                     ServerGamePacketListenerImpl.this.send(new ClientboundSetEquipmentPacket(entity.getId(), Arrays.stream(net.minecraft.world.entity.EquipmentSlot.values()).map((slot) -> Pair.of(slot, ((LivingEntity) entity).getItemBySlot(slot).copy())).collect(Collectors.toList())));
-                                    ServerGamePacketListenerImpl.this.player.containerMenu.sendAllDataToRemote();
                                 }
+
+                                ServerGamePacketListenerImpl.this.player.containerMenu.sendAllDataToRemote(); // Paper - fix slot desync - always refresh player inventory
                             }
 
                             if (event.isCancelled()) {
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index e2ca84fb27cff54eada6ca1c7a96a29d1dbbb4e5..2342892db8b2bb1994727e611abb820f8104e486 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2753,8 +2753,9 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
                 if (!this.level().isClientSide()) {
                     // CraftBukkit start - fire PlayerLeashEntityEvent
                     if (CraftEventFactory.callPlayerLeashEntityEvent(this, player, player, hand).isCancelled()) {
-                        ((ServerPlayer) player).resendItemInHands(); // SPIGOT-7615: Resend to fix client desync with used item
+                        // ((ServerPlayer) player).resendItemInHands(); // SPIGOT-7615: Resend to fix client desync with used item // Paper - Fix inventory desync
                         ((ServerPlayer) player).connection.send(new ClientboundSetEntityLinkPacket(this, leashable.getLeashHolder()));
+                        player.containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
                         return InteractionResult.PASS;
                     }
                     // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/entity/animal/Cow.java b/src/main/java/net/minecraft/world/entity/animal/Cow.java
index d99760f943846a1cfe5d0ec97313f453004feb98..3e00bbff266fc71b07014e7e047d77b7f809239f 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Cow.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Cow.java
@@ -101,6 +101,7 @@ public class Cow extends Animal {
             PlayerBucketFillEvent event = CraftEventFactory.callPlayerBucketFillEvent((ServerLevel) player.level(), player, this.blockPosition(), this.blockPosition(), null, itemstack, Items.MILK_BUCKET, hand);
 
             if (event.isCancelled()) {
+                player.containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
                 return InteractionResult.PASS;
             }
             // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/entity/animal/goat/Goat.java b/src/main/java/net/minecraft/world/entity/animal/goat/Goat.java
index 4c6dc427b90012b0945e073dd905dc7e8d1bec82..76aca47d8638d5c37c57d3a59fa7f8ceaa5a53b4 100644
--- a/src/main/java/net/minecraft/world/entity/animal/goat/Goat.java
+++ b/src/main/java/net/minecraft/world/entity/animal/goat/Goat.java
@@ -238,6 +238,7 @@ public class Goat extends Animal {
             PlayerBucketFillEvent event = CraftEventFactory.callPlayerBucketFillEvent((ServerLevel) player.level(), player, this.blockPosition(), this.blockPosition(), null, itemstack, Items.MILK_BUCKET, hand);
 
             if (event.isCancelled()) {
+                player.containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
                 return InteractionResult.PASS;
             }
             // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/item/ArmorStandItem.java b/src/main/java/net/minecraft/world/item/ArmorStandItem.java
index 15c7c2417db1661c77c35455b59a77b1d1055858..cb4baebe22eeab17aed67a5ecc506b932fe2230b 100644
--- a/src/main/java/net/minecraft/world/item/ArmorStandItem.java
+++ b/src/main/java/net/minecraft/world/item/ArmorStandItem.java
@@ -55,6 +55,7 @@ public class ArmorStandItem extends Item {
                     entityarmorstand.moveTo(entityarmorstand.getX(), entityarmorstand.getY(), entityarmorstand.getZ(), f, 0.0F);
                     // CraftBukkit start
                     if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPlaceEvent(context, entityarmorstand).isCancelled()) {
+                        if (context.getPlayer() != null) context.getPlayer().containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
                         return InteractionResult.FAIL;
                     }
                     // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/item/BlockItem.java b/src/main/java/net/minecraft/world/item/BlockItem.java
index 986b14a7b7c98641201ece649df09e4b8279a36c..c816c935ecc74a811ffdffbe6ded73c06e92324a 100644
--- a/src/main/java/net/minecraft/world/item/BlockItem.java
+++ b/src/main/java/net/minecraft/world/item/BlockItem.java
@@ -108,7 +108,7 @@ public class BlockItem extends Item {
                             if (placeEvent != null && (placeEvent.isCancelled() || !placeEvent.canBuild())) {
                                 blockstate.update(true, false);
 
-                                if (this instanceof SolidBucketItem) {
+                                if (true) { // Paper - if the event is called here, the inventory should be updated
                                     ((ServerPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-4541
                                 }
                                 return InteractionResult.FAIL;
diff --git a/src/main/java/net/minecraft/world/item/EndCrystalItem.java b/src/main/java/net/minecraft/world/item/EndCrystalItem.java
index 5311e653dceb085fcebb8ac5090d84e97e573e62..48317c7436445a7acff9103bac1de558c42f31cc 100644
--- a/src/main/java/net/minecraft/world/item/EndCrystalItem.java
+++ b/src/main/java/net/minecraft/world/item/EndCrystalItem.java
@@ -49,6 +49,7 @@ public class EndCrystalItem extends Item {
                         entityendercrystal.setShowBottom(false);
                         // CraftBukkit start
                         if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPlaceEvent(context, entityendercrystal).isCancelled()) {
+                            if (context.getPlayer() != null) context.getPlayer().containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
                             return InteractionResult.FAIL;
                         }
                         // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/item/MinecartItem.java b/src/main/java/net/minecraft/world/item/MinecartItem.java
index 04eb25b05681a72968917b0b59c030d6629776fa..7153d9ed12276a0f2d8b8a17c79734aa25ed1fa5 100644
--- a/src/main/java/net/minecraft/world/item/MinecartItem.java
+++ b/src/main/java/net/minecraft/world/item/MinecartItem.java
@@ -69,6 +69,7 @@ public class MinecartItem extends Item {
 
                     // CraftBukkit start
                     if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPlaceEvent(context, entityminecartabstract).isCancelled()) {
+                    if (context.getPlayer() != null) context.getPlayer().containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
                         return InteractionResult.FAIL;
                     }
                     // CraftBukkit end