Remove WordPress Posts Page Admin Notice

remove_posts_page_admin_notice.php

<?php

/**
 * Remove Posts Page Admin Notice
 *
 * Since WordPress 4.2, if you edit the page used as the Posts page
 * and there was no content saved for that page, the editor functionality
 * is removed and a message displayed instead.
 *
 * The following function re-enables the editor on this page.
 * Uncomment the remove_action line below if you want to remove
 * the admin message too.
 *
 * @param  WP_Post  $post  Post object
 */
function remove_posts_page_admin_notice( $post ) {

	if ( $post->ID == get_option( 'page_for_posts' ) ) {
		//remove_action( 'edit_form_after_title', '_wp_posts_page_notice' );
		add_post_type_support( get_post_type( $post ), 'editor' );
	}

}
add_action( 'add_meta_boxes_page', 'remove_posts_page_admin_notice' );

?>