Tooltips erratic/off-by-one when supporting both mouseenter and focus

[bkardell]

Test case demonstrated here
http://plnkr.co/edit/xj8TFBBc5NyJoRUp4Ypx?p=preview - if you use both keyboard and mouse to move back and forth you will see incorrect behavior where it doesn't show or shows when it shouldn't.

[wesleycho]

Note that this occurs because more than one is being used - the component is only currently designed to support one option right now.

[wesleycho]

Just adding, this appears to work fine if one used focus, as can be seen here.

[bkardell]

@wesleycho yeah, but this is of course just a simple demonstration of a failure case. Either way, it looks like it got added now, so great.