Paper/patches/unapplied/server/0873-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 7270b6fa96bae937663c0fea77887e21fbd0eb57..530728cd4b258444f6efe064903b521f4b23cd04 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -400,6 +400,7 @@ 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 be0ce72bb493593a3d2eb7d7c37e3a650b7cc34b..0ffa95542a0ed49a3f83700841f7c76c0717ae22 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2729,10 +2729,11 @@ 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 84d283cd637b5c84a8682acec503b0e3831d1684..bd0e205c760414784ae483452fd02292939dcb5c 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2638,8 +2638,9 @@ 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 5a7b1be351834a6b8889b1380cede1be025cb302..e336934f37075a827843e4b1bb2b6b660d2c60c9 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 02e49c7ae5e120302b6479cf3e3934b9217eebf0..376bcbc189008464f4d518c1e07643431ba96306 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
@@ -234,6 +234,7 @@ 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 1634a7d5ff06583408cf2f02f2b5f90931b1e02a..066a6e5ed2632a55324ec0d10f2f8a6bf3f30a0f 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 fc7d978f9e57814a933b9cb725c3af1e7d403795..96fb69ec6db2e7c8c728435f0c537b076259b2fb 100644
--- a/src/main/java/net/minecraft/world/item/BlockItem.java
+++ b/src/main/java/net/minecraft/world/item/BlockItem.java
@@ -114,7 +114,7 @@ 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 f9a940cdff3983d9d4de46bd5ddc1905f9254dcf..273bb38f14b8af08d123e02742d365fb5d91cdf5 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 66074445d3908b9bb1c8d70e1e27d057720ec8e5..d524fcc191cb95d6ec7f12ae7fceeb8077bb08fc 100644
--- a/src/main/java/net/minecraft/world/item/MinecartItem.java
+++ b/src/main/java/net/minecraft/world/item/MinecartItem.java
@@ -137,6 +137,7 @@ 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