Commerce routing fix

Global.asax.cs

public class Global : EPiServer.Global
{
    protected override void RegisterRoutes(RouteCollection routes)
    {
        base.RegisterRoutes(routes);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
    }    
}

RouteConfig.cs

public static class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        // Move commerceeditpageroot route right before editpageroot route 
        // to fix issue with block preview and languages. Why?!
        MoveCommerceEditPageRootRoute(routes);
    }

    private static void MoveCommerceEditPageRootRoute(RouteCollection routes)
    {
        var editPageRootRoutePos = GetEPiServerEditPageRootRouteIndex(routes);

        if (editPageRootRoutePos > -1)
        {
            var commerceEditPageRootRoute = GetCommerceEditPageRootRoute(routes);

            if (commerceEditPageRootRoute != null)
            {
                routes.Remove(commerceEditPageRootRoute);
                routes.Insert(editPageRootRoutePos - 1, commerceEditPageRootRoute);
            }
        }
    }
    
    private static int GetEPiServerEditPageRootRouteIndex(RouteCollection routes)
    {
        var editPageRootRoute = routes["editpageroot"];

        if (editPageRootRoute != null)
        {
            return routes.IndexOf(editPageRootRoute);
        }

        return -1;
    }

    private static RouteBase GetCommerceEditPageRootRoute(RouteCollection routes)
    {
        return routes["commerceeditpageroot"];
    }
}