From c560723f16f4031e744c72e218e20b0153c35e3f Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sun, 11 Feb 2018 10:43:46 +0000
Subject: [PATCH] Extend Player Interact cancellation to GUIs

GUIs are opened on the client, meaning that the server cannot block them from opening,
However, it is possible to close these GUIs from the server.

diff --git a/src/main/java/net/minecraft/server/PlayerInteractManager.java b/src/main/java/net/minecraft/server/PlayerInteractManager.java
index 5ec7f5819..b1cdb2154 100644
--- a/src/main/java/net/minecraft/server/PlayerInteractManager.java
+++ b/src/main/java/net/minecraft/server/PlayerInteractManager.java
@@ -468,6 +468,12 @@ public class PlayerInteractManager {
                     ((EntityPlayer) entityhuman).playerConnection.sendPacket(new PacketPlayOutBlockChange(world, bottom ? blockposition.up() : blockposition.down()));
                 } else if (blockdata.getBlock() instanceof BlockCake) {
                     ((EntityPlayer) entityhuman).getBukkitEntity().sendHealthUpdate(); // SPIGOT-1341 - reset health for cake
+                // Paper start - extend Player Interact cancellation to GUIs
+                } else if (blockdata.getBlock() instanceof BlockStructure) {
+                    ((EntityPlayer) entityhuman).playerConnection.sendPacket(new PacketPlayOutCloseWindow());
+                } else if (blockdata.getBlock() instanceof BlockCommand) {
+                    ((EntityPlayer) entityhuman).playerConnection.sendPacket(new PacketPlayOutCloseWindow());
+                // Paper end - extend Player Interact cancellation to GUIs
                 }
                 ((EntityPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-2867
                 enuminteractionresult = (event.useItemInHand() != Event.Result.ALLOW) ? EnumInteractionResult.SUCCESS : EnumInteractionResult.PASS;
-- 
2.18.0