Ticket #27880: exampleplugin.php

<?php
/*
 * Plugin Name: Disable Drag/Drop File Uploads via Edit Post
 * Plugin URI: http://wordpress.org/plugins/
 * Description: Disable the ability to drag and drop uploads directly into the WordPress Editor to allow older behavior of drag/drop text.
 * Author: Brandon Kraft
 * Version: 1.0
 * Author URI: http://brandonkraft.com
 * License: GPL2+
 */

function disable_dragdrop_wpeditor( $wp_editor_args ) {
        $wp_editor_args['drag_drop_upload'] = false;
        return $wp_editor_args;
}

/* Note this filter does not currently exist. */

add_filter( 'edit_form_editor_args', 'disable_dragdrop_wpeditor' );