Don't adjust the position of transitioning list items.

Adjusting the position of list items only makes sense for items that
belongs to the layout.

Task-number: QTBUG-38229
Change-Id: I7a05f7a3591620cce3cd9ab84cfecbe325e5e93c
Reviewed-by: Bea Lam <bea.lam@jollamobile.com>
Support smooth for AnimatedSprite

Task-number: QTBUG-38923
Change-Id: I1cb9ac434aa729ee390e17deced9ed470895549d
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>