Menu: Make key navigation to submenu faster
Menu: Make key navigation to submenu faster

Change-Id: I4423f29d9c678d3432732ddf612042446e196869
Reviewed-by: Jens Bache-Wiig <9cea9d70b08f8210134ec5959114f72bad51ed1d@digia.com>

drgvond/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,kobolabs/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,jfaust/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,jfaust/qtquickcontrols