client: combar moves not correctly when the scrollbar is used
Issue generated from Tuleap's migration script. Originally submitted by: Nicolas Jager (nicolasjager-sfl)
if the cursor is over an item, the combar is shown.
the combar is still shown when moving the cursor over the scrollbar.
using the scrollbar keeps the good row for the combar. But if the item isn't in the part of the smartlist rendered, the combar is shown on the wrong item. The combar should be hidden.