Mouse hover disturbs keyboard select

[fritx]

Mouse hover on the at-panel disturbs keyboard select.

If the mouse remains at the 3rd item on the list, when we press the up/down keys, the list scrolls, but the 3rd place would keep getting selected unexpectedly.

A workaround to avoid this if you care much about it, is to disable the hover-selecting feature:

<at :hover-select="false"></at>

Fixing this bug with hover-select turned on (by default), is also under development.