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 5c3e5c348e6fececccd8097355f423b9e7ad982b..064a7a3e1c4d192010e072a5e985a54135748d87 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -61,6 +61,8 @@ 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;
@@ -191,10 +193,7 @@ 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;
                 }
@@ -205,10 +204,7 @@ 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
@@ -393,10 +389,12 @@ 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 8bf268094c6034d8b90b0e4d1a5269cce9216cdc..196026e7f0689270d9c7320109c9f4fbe697f3d0 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1779,8 +1779,28 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                         return;
                     }
                     // Paper end - Don't allow digging into 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().getMaxY(), 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");