Must-Use Plugin Not Available for String Scanning in Theme and Plugins Localization

Overview of the issue

Must-Use (MU) plugins are not available for string scanning under WPML > Theme and Plugins Localization page.

Workaround

Please, make sure of having a full backup of your site before proceeding.

• Open …/wp-content/plugins/wpml-string-translation/classes/menus/theme-plugin-localization-ui/class-st-plugin-localization-ui-utils.php file.
• Look for line 6.
• Replace:

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  /** @return array */ public function get_plugins() {     $plugins    = get_plugins();     $mu_plugins = wp_get_mu_plugins();       if ( $mu_plugins ) {         foreach ( $mu_plugins as $p ) {             $plugin_file             = basename( $p );             $plugins[ $plugin_file ] = array( 'Name' => 'MU :: ' . $plugin_file );         }     }       return $plugins; }

• With:

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  public function get_plugins() {     $plugins = get_plugins();     $mu_plugins = wp_get_mu_plugins();       if ( $mu_plugins ) {         foreach ( $mu_plugins as $p ) {             $plugin_file = basename( $p );             $plugins[ $plugin_file ] = array( 'Name' => 'MU :: ' . $plugin_file );         }           //Workaround         $folders = scandir(WPMU_PLUGIN_DIR);         $folders = array_diff($folders, array('.', '..'));                   foreach($folders as $folder) {             if (is_dir(WPMU_PLUGIN_DIR.'/'.$folder)) {                 $plugin_file = basename( $folder );                 $plugins[ $plugin_file ] = array( 'Name' => 'MU :: ' . $plugin_file );             }         }     }       return $plugins; }