PaperMC/patches/server/0736-Make-hoppers-respect-inventory-max-stack-size.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 7 Jul 2021 16:30:17 -0700
Subject: [PATCH] Make hoppers respect inventory max stack size


diff --git a/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java
index 08c4a0996410a42418d4a5da3ed1f4db2f171dd2..d41851f9119c334cae3fc2c433d6450a3eed9096 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java
@@ -599,7 +599,7 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
                 stack = ItemStack.EMPTY;
                 flag = true;
             } else if (HopperBlockEntity.canMergeItems(itemstack1, stack)) {
-                int j = stack.getMaxStackSize() - itemstack1.getCount();
+                int j = Math.min(stack.getMaxStackSize(), to.getMaxStackSize()) - itemstack1.getCount(); // Paper
                 int k = Math.min(stack.getCount(), j);
 
                 stack.shrink(k);