<?php

/* Revolution Slider - display sticky posts first - by Arkanite */
function revslider_sticky_posts_first($query, $slider_id) {
    // only apply the special filter for slider with "x" ID
    // http://prntscr.com/r3ovyu
	
	// create du duplication of the query that looks for sticky posts only
	$query_sticky = $query;
	$query_sticky['post__in'] = get_option('sticky_posts');
	$query_sticky['fields'] = 'ids';
	$query_sticky = new WP_Query($query_sticky);
	
	// create du duplication of the query that looks for non-sticky posts only
	$query_others = $query;
	$query_others['post__not_in'] = get_option('sticky_posts');
	$query_others['fields'] = 'ids';
	$query_others = new WP_Query($query_others);
	
	// merge the post ids of these two queries' retults, starting with the sticky ones
	$idz = array_merge($query_sticky->posts,$query_others->posts);
	
	// order the original query to look for these ids in this specific order
	$query['post__in'] = $idz;
	$query['orderby'] = 'post__in';
	$query['order'] = 'ASC';
	$query['ignore_sticky_posts'] = 0;
	$query['tax_query'] = false;
	
    return $query;
}
add_filter('revslider_get_posts', 'revslider_sticky_posts_first', 10, 2);