elm:list: Avoiding two items be focused at same action

elm:list: Avoiding two items be focused at same action

On a list that have not received focus yet a mouse down gives the focus
for the list (that gives the focus for the first item) and the mouse
up the item is selected and receive the focus.

The problem:  if the list is scrolled the focus given for the
first item makes the list scroll to the top and not for the item
selected by the user.