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 a7c0db6aebef3aec931513c726447091088cc546..5333488e606f2966271e1d25bacfa4196ca5145b 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 - Send block entities after destroy prediction
+    public boolean capturedBlockEntity = false; // Paper - Send block entities after destroy prediction
 
     public ServerPlayerGameMode(ServerPlayer player) {
         this.gameModeForPlayer = GameType.DEFAULT_MODE;
@@ -188,10 +190,7 @@ 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 entities after destroy prediction
                     // CraftBukkit end
                     return;
                 }
@@ -202,10 +201,7 @@ public class ServerPlayerGameMode {
                     // Let the client know the block still exists
                     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 entities after destroy prediction
                     return;
                 }
                 // CraftBukkit end
@@ -389,10 +385,12 @@ public class ServerPlayerGameMode {
                 }
 
                 // Update any tile entity data for this block
+                if (!captureSentBlockEntities) { // Paper - Send block entities after destroy prediction
                 BlockEntity tileentity = this.level.getBlockEntity(pos);
                 if (tileentity != null) {
                     this.player.connection.send(tileentity.getUpdatePacket());
                 }
+                } else {capturedBlockEntity = true;} // Paper - Send block entities after destroy prediction
                 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 d8f77bbf533b45e3964c8b0920396b9bed4b3b99..5cb69d9fbff2ee1e647c21e40a17b7244815f213 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1783,8 +1783,28 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                     return;
                 }
                 // Paper end - Don't allow digging in unloaded chunks
+                // Paper start - Send block entities after destroy prediction
+                this.player.gameMode.capturedBlockEntity = false;
+                this.player.gameMode.captureSentBlockEntities = true;
+                // Paper end - Send block entities after destroy 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 destroy 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 destroy prediction
                 return;
             default:
                 throw new IllegalArgumentException("Invalid player action");