Editing state

// Register Custom Status
function Editing_() {

	$args = array(
		'label'                     => _x( 'Editing', 'Status General Name', 'text_domain' ),
		'label_count'               => _n_noop( 'Editing (%s)',  'Editing (%s)', 'text_domain' ), 
		'public'                    => false,
		'show_in_admin_all_list'    => true,
		'show_in_admin_status_list' => true,
		'exclude_from_search'       => false,
	);
	register_post_status( 'editing', $args );

}
add_action( 'init', 'Editing_', 0 );