Problem: Shortcode parser only loaded on frontend

Hello.
While analyzing why the dflip shortcode exhibited problems when used in conjunction with our plugin (Paperview Publisher), I noticed that the shortcode parser is only loaded when the request is in a frontend context; when in a backend context, the parser is not loaded. This, in turn, makes “apply_filters(‘the_content’, <content to filter>)” not return the content with the shortcode replaced by the corresponding HTML when it is invoked in the backend (in this specific case, in a plugin that runs in wp-admin, when there is new post content).

The problematic snippet is in 3d-flipbook-dflip-lite.php, line 554:

// Load admin only components.
 if ( is_admin() && !wp_doing_ajax() ) {
   $this->init_admin();
 } else { // Load frontend only components.
   $this->init_front();
 }

My suggestion is to include the unconditional loading of the shortcode parser, like this:

//include the shortcode parser
 include_once dirname( __FILE__ ) . "/inc/shortcode.php";

 // Load admin only components.
 if ( is_admin() && !wp_doing_ajax() ) {
   $this->init_admin();
 } else { // Load frontend only components.
   $this->init_front();
 }

(The include_once is extracted from init_front. It can be removed from the function afterward, or just left there, as the code won’t be loaded again anyway.)

I understand that you try to load only the necessary components, and that is fine. However, IMHO, loading the shortcode parser is not a particularly cumbersome or heavy operation (especially if PHP has a caching mechanism configured), but not loading it may lead to the ‘the_content’ filter not returning the expected results when run in the wp-admin context.

Thank you for your time.

Best regards,
Jo?o Saraiva (Paperview Systems)