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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: chickeneer <emcchickeneer@gmail.com>
Date: Tue, 16 Feb 2021 21:37:51 -0600
Subject: [PATCH] Prevent grindstones from overstacking items


diff --git a/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java b/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
index 811d7415ae843347da374d73b4edfe89642d518a..24187a7ce812cb83a9a736bec8dce9e68ccc0798 100644
--- a/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
@@ -198,13 +198,13 @@ public class GrindstoneMenu extends AbstractContainerMenu {
                 i = Math.max(item.getMaxDamage() - l, 0);
                 itemstack2 = this.mergeEnchants(itemstack, itemstack1);
                 if (!itemstack2.isDamageableItem()) {
-                    if (!ItemStack.matches(itemstack, itemstack1)) {
+                    if (!ItemStack.matches(itemstack, itemstack1) || (itemstack2.getMaxStackSize() == 1 && !io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.allowGrindstoneOverstacking)) { // Paper - add max stack size check & config value
                         org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareGrindstoneEvent(this.getBukkitView(), ItemStack.EMPTY); // CraftBukkit
                         this.broadcastChanges();
                         return;
                     }
 
-                    b0 = 2;
+                    b0 = 2; // Paper - the problem line for above change, causing over-stacking
                 }
             } else {
                 boolean flag3 = !itemstack.isEmpty();