void RenderLayerModelObject::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
    if (RenderStyle* oldStyle = style()) {
        if (parent() && diff.needsPaintInvalidationLayer()) {
            if (oldStyle->hasAutoClip() != newStyle.hasAutoClip()
                || oldStyle->clip() != newStyle.clip())
                layer()->clipper().clearClipRectsIncludingDescendants();
        }
    }

    RenderObject::styleWillChange(diff, newStyle);
}