From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sat, 3 Jul 2021 18:40:32 -0500
Subject: [PATCH] Store placer on Block when placed


diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index d644d02b039ca918391a32a04549f7a34386b3f9..42b259c3878bd34b8e7cb768887fd1456be8db35 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -503,6 +503,7 @@ public final class ItemStack implements DataComponentHolder {
                     world.isBlockPlaceCancelled = true; // Paper - prevent calling cleanup logic when undoing a block place upon a cancelled BlockPlaceEvent
                         for (BlockState blockstate : blocks) {
                             blockstate.update(true, false);
+                        ((CraftBlock) blockstate.getBlock()).getNMS().getBlock().forgetPlacer(); // Purpur
                         }
                     world.isBlockPlaceCancelled = false; // Paper - prevent calling cleanup logic when undoing a block place upon a cancelled BlockPlaceEvent
                         world.preventPoiUpdated = false;
@@ -535,6 +536,7 @@ public final class ItemStack implements DataComponentHolder {
                             if (!(block.getBlock() instanceof BaseEntityBlock)) { // Containers get placed automatically
                                 block.onPlace(world, newblockposition, oldBlock, true, context);
                             }
+                        block.getBlock().forgetPlacer(); // Purpur
 
                             world.notifyAndUpdatePhysics(newblockposition, null, oldBlock, block, world.getBlockState(newblockposition), updateFlag, 512); // send null chunk as chunk.k() returns false by this point
                         }
diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index fa19720fbb911842db42a4eb0ccf8406cb27c137..135e59e549cbcb3806574f964947b6ff3ea517d1 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -440,7 +440,17 @@ public class Block extends BlockBehaviour implements ItemLike {
         } // Paper - fix drops not preventing stats/food exhaustion
     }
 
-    public void setPlacedBy(Level world, BlockPos pos, BlockState state, @Nullable LivingEntity placer, ItemStack itemStack) {}
+    // Purpur start
+    @Nullable protected LivingEntity placer = null;
+
+    public void setPlacedBy(Level world, BlockPos pos, BlockState state, @Nullable LivingEntity placer, ItemStack itemStack) {
+        this.placer = placer;
+    }
+
+    public void forgetPlacer() {
+        this.placer = null;
+    }
+    // Purpur end
 
     public boolean isPossibleToRespawnInThis(BlockState state) {
         return !state.isSolid() && !state.liquid();