prevent sitemap button from being added every time ckeditor is opened, resulting in multiple sitemap buttons on the link plugins
prevent sitemap button from being added every time ckeditor is opened, resulting in multiple sitemap buttons on the link plugins

ExchangeCore/Concrete5-CKEditor,MrKarlDilkington/Concrete5-CKEditor,MrKarlDilkington/Concrete5-CKEditor,ExchangeCore/Concrete5-CKEditor