WP_query 'orderby=none' Problem

Question

I have another database which stores post's IDs and I want do display them using WP_query to use the WP default pagination. I'm using orderby => none to preserve the original order, but the result reorders them by IDs.

$ids = array (60, 23, 78, 46, 105, 130)

$args = array (
    'posts_per_page' => -1,
    'post__in' => $ids,
    'orderby' => 'none'
);

$query = new WP_Query ( $args );

while ( have_posts() ) : the_post();
    echo '<li>';
    the_title();
    echo '</li>';
endwhile;

Could anyone help me?

Thanks, Romulo De Lazzari