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 c3056e06a2dfb35ed8302af78525a3336433fa94..6196e3c7a6c3fb43402870b6b35d05404beee292 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -497,6 +497,7 @@ 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;
@@ -529,6 +530,7 @@ public final class ItemStack implements DataComponentHolder {
                         if (!(block.getBlock() instanceof BaseEntityBlock)) { // Containers get placed automatically
                             block.onPlace(world, newblockposition, oldBlock, true, context); // Paper - pass 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 45704653310efe9cb755a644674b54b8722c2c84..1ef3b68d71c33ffb248a4b88fcfdc98a0360c4aa 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -437,7 +437,17 @@ 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();