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Add thumbnail support for a post type without stomping old types.
$thumbnails = get_theme_support('post-thumbnails');
if (is_array($thumbnails)) {
add_theme_support('post-thumbnails', array_merge($thumbnails[0], array(self::$post_type)));
else if (!$thumbnails) {
add_theme_support('post-thumbnails', array(self::$post_type));
// else already enabled for all post types
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