Well I'm not sure.
The leakage is at the very bottom of the display, so you may not even see it when working on photos, because you will be using area higher up on the display. On the other hand, it's also possible that you still may see it. There's really no way of finding out until you physically test it out.
I think the best way to judge for yourself would be to go to your local computer store that carries the M40 and simply check it out for yourself.