testimonials_widget_query_args.php

add_filter( 'tw_query_args', array( &$this, 'query_args' ), 10, 2 );
public function query_args( $args, $atts ) {
	global $wpdb;

	$args['post_type'] = $atts['post_type'];

	$no_cache = $atts['no_cache'];

	if ( $no_cache ) {
		$args['no_cache'] = 1;
	}

	if ( empty( $args['post__in'] ) ) {
		$post__in = array();
	} else {
		$post__in = $args['post__in'];
	}

	if ( ! empty( $post__in ) ) {
		$post__in         = array_unique( $post__in );
		$args['post__in'] = $post__in;
	}

	return $args;
}