Shift click deletes item

If you shift click an item from your inventory with a full hotbar, the item gets deleted

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. open inventory
2. ...fill all spaces in the hotbar
3. ...shift click a item from the top of your inventory while your hot bar s full
4...the item gets deleted