From 7baf538a7684cadffc012c2dc580ee52c84d552a Mon Sep 17 00:00:00 2001
From: NotMyWing <winwyv@gmail.com>
Date: Tue, 11 Mar 2025 19:11:08 +1100
Subject: [PATCH] Fix stack sizes underflowing when shift-clicking into
 oversized slots

Fixes #519
---
 src/main/java/appeng/container/AEBaseContainer.java | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/main/java/appeng/container/AEBaseContainer.java b/src/main/java/appeng/container/AEBaseContainer.java
index d3dd07e15..c097c05ad 100644
--- a/src/main/java/appeng/container/AEBaseContainer.java
+++ b/src/main/java/appeng/container/AEBaseContainer.java
@@ -399,9 +399,17 @@ public abstract class AEBaseContainer extends Container {
                                     return ItemStack.EMPTY; // don't insert duplicate encoded patterns to interfaces
                                 }
 
-                                int maxSize = Math.min(tis.getMaxStackSize(), d.getSlotStackLimit());
+                                final int maxSize;
+                                if (d instanceof SlotOversized slotOversized) {
+                                    maxSize = slotOversized.getSlotStackLimit();
+                                } else {
+                                    maxSize = Math.min(tis.getMaxStackSize(), d.getSlotStackLimit());
+                                }
 
                                 int placeAble = maxSize - t.getCount();
+                                if (placeAble <= 0) {
+                                    continue;
+                                }
 
                                 if (tis.getCount() < placeAble) {
                                     placeAble = tis.getCount();