Tooltip occasionally won't hide when using a hide delay

Created by: cerlestes

JS Fiddle

http://jsfiddle.net/d45cc0rs/

Problem

After setting a hide delay on the tooltip component, when moving the cursor away from the element during the transition/animation, the tooltip will be stuck and won't hide anymore until you move over it again and wait for the animation to finish completely.

This leads to multiple and really nasty stuck tooltips across the webpage:

Reproducability

This bug is reproducable in all browsers, starting with commit 1b63d0b9 from #13782.