Paper/patches/server/0921-Send-block-entities-after-destroy-prediction.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sat, 25 Jun 2022 19:45:20 -0400
Subject: [PATCH] Send block entities after destroy prediction

Minecraft's prediction system does not handle block entities, so if we are manually sending block entities during
block breaking we need to set it after the prediction is finished. This fixes block entities not showing when cancelling the BlockBreakEvent.

diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
index 9378e83a67a70dbb1fb4f05b33f1e553d008e62b..5a60f5dc202c44b06ca34e9a19d45cb715f74fd3 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -62,6 +62,8 @@ public class ServerPlayerGameMode {
     private BlockPos delayedDestroyPos;
     private int delayedTickStart;
     private int lastSentState;
+    public boolean captureSentBlockEntities = false; // Paper
+    public boolean capturedBlockEntity = false; // Paper
 
     public ServerPlayerGameMode(ServerPlayer player) {
         this.gameModeForPlayer = GameType.DEFAULT_MODE;
@@ -187,10 +189,7 @@ public class ServerPlayerGameMode {
                     this.player.connection.send(new ClientboundBlockUpdatePacket(pos, this.level.getBlockState(pos)));
                     this.debugLogging(pos, false, sequence, "may not interact");
                     // Update any tile entity data for this block
-                    BlockEntity tileentity = this.level.getBlockEntity(pos);
-                    if (tileentity != null) {
-                        this.player.connection.send(tileentity.getUpdatePacket());
-                    }
+                    capturedBlockEntity = true; // Paper - send block entity after predicting
                     // CraftBukkit end
                     return;
                 }
@@ -206,10 +205,7 @@ public class ServerPlayerGameMode {
                     // Paper end
                     this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
                     // Update any tile entity data for this block
-                    BlockEntity tileentity = this.level.getBlockEntity(pos);
-                    if (tileentity != null) {
-                        this.player.connection.send(tileentity.getUpdatePacket());
-                    }
+                    capturedBlockEntity = true; // Paper - send block entity after predicting
                     return;
                 }
                 // CraftBukkit end
@@ -385,10 +381,12 @@ public class ServerPlayerGameMode {
                 }
 
                 // Update any tile entity data for this block
+                if (!captureSentBlockEntities) { // Paper - Toggle this location for capturing as this is used for api
                 BlockEntity tileentity = this.level.getBlockEntity(pos);
                 if (tileentity != null) {
                     this.player.connection.send(tileentity.getUpdatePacket());
                 }
+                } else {capturedBlockEntity = true;} // Paper end
                 return false;
             }
         }
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 92617a19fb328320e17b58956cf0276d5a08325b..e88c82aac6d9947c7205f865c18146e7a5756b40 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1874,8 +1874,28 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
                     return;
                 }
                 // Paper end - Don't allow digging in unloaded chunks
+                // Paper start - send block entities after prediction
+                this.player.gameMode.capturedBlockEntity = false;
+                this.player.gameMode.captureSentBlockEntities = true;
+                // Paper end - send block entities after prediction
                 this.player.gameMode.handleBlockBreakAction(blockposition, packetplayinblockdig_enumplayerdigtype, packet.getDirection(), this.player.level.getMaxBuildHeight(), packet.getSequence());
                 this.player.connection.ackBlockChangesUpTo(packet.getSequence());
+                // Paper start - send block entities after prediction
+                this.player.gameMode.captureSentBlockEntities = false;
+                // If a block entity was modified speedup the block change ack to avoid the block entity
+                // being overriden.
+                if (this.player.gameMode.capturedBlockEntity) {
+                    // manually tick
+                    this.send(new ClientboundBlockChangedAckPacket(this.ackBlockChangesUpTo));
+                    this.player.connection.ackBlockChangesUpTo = -1;
+
+                    this.player.gameMode.capturedBlockEntity = false;
+                    BlockEntity tileentity = this.player.level.getBlockEntity(blockposition);
+                    if (tileentity != null) {
+                        this.player.connection.send(tileentity.getUpdatePacket());
+                    }
+                }
+                // Paper end - send block entities after prediction
                 return;
             default:
                 throw new IllegalArgumentException("Invalid player action");