Fix for expanding size policy
Fix for expanding size policy

We need to set the stretch factor when the size policy is expanding.

Reviewed-by: adriano

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