Using select_next_item() and select_previous_item()

scenes/ui/quick_slots.gd

@@ -48,9 +48,9 @@ func _unhandled_input(event: InputEvent) -> void:
 	elif event.is_action_pressed("quickslot10"):
 		select_quick_slot(9)
 	elif event.is_action_pressed("quickslot_next"):
-		select_quick_slot((_selected_item + 1))
+		select_next_item()
 	elif event.is_action_pressed("quickslot_previous"):
-		select_quick_slot((_selected_item - 1))
+		select_previous_item()
 
 
 func get_quickslot_index() -> int: