Paper/Spigot-Server-Patches/0436-Clear-containers-when-block-place-is-cancelled.patch

From 86d1c4ec47db13ba21b98d644aee08f792fc20dd Mon Sep 17 00:00:00 2001
From: Zach Brown <zach@zachbr.io>
Date: Sat, 6 Apr 2019 00:30:32 -0400
Subject: [PATCH] Clear containers when block place is cancelled

Fixes GH-1831

diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
index d8ebcf0a3..0ef928a2b 100644
--- a/src/main/java/net/minecraft/server/ItemStack.java
+++ b/src/main/java/net/minecraft/server/ItemStack.java
@@ -246,6 +246,11 @@ public final class ItemStack {
                     for (Map.Entry<BlockPosition, TileEntity> e : world.capturedTileEntities.entrySet()) {
                         if (e.getValue() instanceof TileEntityLootable) {
                             ((TileEntityLootable) e.getValue()).setLootTable(null);
+
+                            // Clear containers before updating their blockstate below - Fixes GH-1831
+                            if (e.getValue() instanceof TileEntityContainer) {
+                                ((TileEntityContainer) e.getValue()).clear();
+                            }
                         }
                     }
                     // Paper end
-- 
2.21.0