Item Repair Duplicating Item

Basically when you put any two items in your crafting window to repair them you eg: 2 stone picks in the 2x2 crafting window, you get a repaired item that you can take and place in your inventory over and over. When you take the repaired item, it doesn't clear the crafting table, so you can keep taking the repaired item, and you can take back your broken items as well.