Fiddlesticks W range indicator bug

If you spam your drain (w) like when running at a target or whatever, after the drain begins to channel, the range indicator for the spell shows until you queue up another spell or left click. Left clicking during the drain doesn't seem to cancel the drain. If you press W just once the spell will cast without showing the indicator. Oh, and this is with smart cast on. Not the biggest deal but just a little annoying especially early on just jungling while you spam your w in preparation for the cooldown to come back up.