DarkLevi

instead of commenting out
'number' => (int) $_POST['limit'],
you can put the number of suggestions maximal shown

even not working cause every entry will be fetched over 30 times, so do this:

$user_search_results_multiple = get_users( $args );
		$user_search_results = array_unique($user_search_results_multiple, SORT_REGULAR);
		array_splice($user_search_results, 6(number of entries shown));
		if ( empty( $user_search_results ) ) {

did it:

$args = array(
			'count_total' => false,
			'number'      => (int) $_POST['limit'],
			'search'      => "{$search_query}*"
		);

to

$args = array(
			'count_total' => false,
			//'number'      => (int) $_POST['limit'],
			'search'      => "{$search_query}*"
		);

and

$user_search_results = get_users( $args );
		if ( empty( $user_search_results ) ) {

to

$user_search_results_multiple = get_users( $args );
		$user_search_results = array_unique($user_search_results_multiple, SORT_REGULAR);
		if ( empty( $user_search_results ) ) {

=)