Help with a stack doubling problem

[kwpugh]

Hi all, I hope someone can help.

I have be trying to figure out why an error is happening.

I've updated my BackPack mod from 1.18.2 to 22w18a and noticed an odd behavior.

• shift-clicking a stack from inventory to backpack works fine
• BUT, shift-clicking a stack from backpack to inventory inserts double the amount, unless the result would equal a full stack

This is my main screen handler for the backpack: https://github.com/kwpugh/SimpleBackpack/blob/22w18a/src/main/java/com/kwpugh/simple_backpack/backpack/BackpackScreenHandler.java

My full mod can be found here: https://github.com/kwpugh/SimpleBackpack/tree/22w18a/src/main/java/com/kwpugh/simple_backpack

The logic for the transferSlot() method is unchanged from 1.18.2 and was largely based on the code from the vanilla ShulkerBoxScreenHandler class.

This has me stumped and any help would be wonderful.