List of all available inventory slots in the preferred search order.
        Does not include the additional slots from the open window.

        1. active slot
        2. remainder of the hotbar
        3. remainder of the persistent inventory

def inv_slots_preferred(self):
        """
        List of all available inventory slots in the preferred search order.
        Does not include the additional slots from the open window.

        1. active slot
        2. remainder of the hotbar
        3. remainder of the persistent inventory
        """
        slots = [self.active_slot]
        slots.extend(slot for slot in self.window.hotbar_slots
                     if slot != self.active_slot)
        slots.extend(self.window.inventory_slots)
        return slots