Request: Note when a save state is used

[ReyVGM]

When in windowed mode, it's easy to see when a save state is being used because the status bar on the bottom shows you. But when in full screen mode, there's no way to tell if the save slot you selected is used or not.

So, if possible, I request for the messages to say something like "Slot 1 Selected (Used)" or "Slot 1 Selected (Full)" when picking a save slot.

Thanks in advance.