autoSelectFirst and groupBy visual highlight of first item not correct

[voodoocode]

Hi,
when setting
autoSelectFirst: true, groupBy: 'category'

the behaviour of the visual selecting isn't as I would expect.

The item with the group's name will be highlighted (gets the selected class), instead it should be correctly highlight the first suggestion in that group (the second list item).

However on pressing Enter the first suggestion of the first group is written to the input correctly.

(tested this with the current master's NBA/NHL example, by adding autoSelectFirst)