How to use a Must-Use plugin to hide a regular one and to hide itself?

Apparently, there’s no way to remove one plugin from the Must-Use list…

But then, found a filter that does even better:
show_advanced_plugins will completely hide the sight of the Must-Use plugins.

After all, if you’re trying to hide something of this nature, then hide it all…

It’s inside the class WP_Plugins_List_Table and takes two arguments: a boolean and the plugin type (mustuse and dropins).

Check this article for a reference of MU and specially Drop-ins. But, for the sake of the wiki, I’ll post the DI table at the end of this answer.

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Update:
– mu-plugin updated to multiple users and multiple hide plugins ^{was string now it’s array}

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The Drop-in plugin

For testing this procedure we need one of those. Create a file named db.php at the root of your wp-content folder and copy this:

<?php
/*
    Plugin Name: Just for testing Drop-ins
    Version: 0.1
    Author: WPSE-53866
    Author URI: http://wordpress.stackexchange.com/
*/

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The Must-use plugin

Then, this one inside the mu-plugins folder, and set the parameters of the class.

<?php
/*
Plugin Name: Hide Must-Use and Drop-ins from the Plugins listing
Plugin URI: http://wordpress.stackexchange.com/questions/53866
Description: Used to hide the Must-Use and Drop-ins plugins from all users except one. Also can hide a selected plugin from the regular list, be it active or not.
Version: 1.1
Author: brasofilo
AuthorURI: http://wordpress.stackexchange.com/users/12615/
*/

/**
 * Parameters of the class - sorry for the non-standard documentation
 *
 * @super_admin     : array   (required)    : the users which are able to see everything
 * @can_see_mustuse : boolean (required)    : can other users see the Must-Use list?
 * @can_see_dropins : boolean (required)    : can other users see the Drop-ins list?
 * @hide_this_one   : array   (optional)    : plugins to hide in the regular listing
 *
 * Reference article for Must-Use and Drop-ins
 * http://hakre.wordpress.com/2010/05/01/must-use-and-drop-ins-plugins/
 */

add_action('admin_init', 'wpse_53866_fire_plugin');

function wpse_53866_fire_plugin() 
{
    global $pagenow;
    if( 'plugins.php' != $pagenow) 
        return;

    $wpse53866_HideAdvancedPlugins_instance = new Wpse53866_HideAdvancedPlugins(
        array(
            'super_admin'       => array('Rodolfo','roda'),
            'can_see_mustuse'   => false,
            'can_see_dropins'   => true,
            'hide_this_ones'    => array( 'set-user-locale.php', 'akismet/akismet.php' )
        )
    );
}

class Wpse53866_HideAdvancedPlugins
{
    public function __construct($data)
    {       
        $this->user     = $data['super_admin'];
        $this->mustuse  = $data['can_see_mustuse'];
        $this->dropins  = $data['can_see_dropins'];
        $this->hide     = isset( $data['hide_this_ones'] ) ? $data['hide_this_ones'] : false;

        if($this->hide)
            add_filter( 'all_plugins', array(&$this, 'on_list_plugins' ) );

        add_filter( 'show_advanced_plugins', array(&$this, 'on_list_advanced' ), 10, 2 );
    }

    public function on_list_plugins($plugins)
    {
            global $current_user;

            if( ! in_array( $current_user->user_login, $this->user ) )
            {
                foreach( $this->hide as $plug )
                    unset( $plugins[$plug] );               
            }

           return $plugins;
    }

    public function on_list_advanced($show, $type)
    {
            global $current_user;

            if( ! in_array( $current_user->user_login, $this->user ) ) 
            {
                if( 'mustuse' == $type ) 
                    return $this->mustuse;

                if( 'dropins' == $type ) 
                    return $this->dropins;
            }

           return true;
    }
}

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Reference

by hakre on wordpress