move the mouse over a choice should update the current selection

[dalf]

Right now, if :

• the user the keyboard to change the selection, but doesn't validate
• move the mouse over the choices
  There are two highlights choices.

It would be less confusing to update the selection when the user moves the mouse over the choices.

[ScherlOMatic]

this would also fix my problem when selecting a value with the keyboard and pressing enter, the form get's submitted but the autocomplete value is missing.

[baptistedonaux]

I looked your MR #48. Its seems good but I'm not sure that everybody want this comportment.

Could you add another variable (OverSelection) to enable/disable this comportement according to user workflow ?