Fix Gutenberg breaking backward compatibility: AJAX script must be re…

…gistered twice to support enqueue inside iframe

- [Block Editor: Enqueueing Assets in the Editor](https://developer.wordpress.org/block-editor/how-to-guides/enqueueing-assets-in-the-editor/#backward-compatibility-and-known-issues)
- [enqueue_block_assets hook loads scripts twice](WordPress/gutenberg#53590)
- Resolves #135

framework/ajax/enqueue.php

@@ -15,7 +15,7 @@ function enqueue() {
 
 function register() {
 
-  if (ajax::$state->registered) return;
+  // if (ajax::$state->registered) return;
 
   wp_deregister_script('tangible-ajax'); // Override previous versions
 
@@ -53,9 +53,13 @@ function conditional_enqueue() {
 // Register after priority 1, when plugin framework used to register
 add_action('wp_enqueue_scripts', __NAMESPACE__ . '\\register', 2);
 add_action('admin_enqueue_scripts', __NAMESPACE__ . '\\register', 2);
+add_action('enqueue_block_assets', __NAMESPACE__ . '\\register', 2);
+add_action('enqueue_block_editor_assets', __NAMESPACE__ . '\\register', 2);
 
 add_action('wp_enqueue_scripts', __NAMESPACE__ . '\\conditional_enqueue', 999);
 add_action('admin_enqueue_scripts', __NAMESPACE__ . '\\conditional_enqueue', 999);
+add_action('enqueue_block_assets', __NAMESPACE__ . '\\conditional_enqueue', 999);
+add_action('enqueue_block_editor_assets', __NAMESPACE__ . '\\conditional_enqueue', 999);
 
 add_action('wp_footer', __NAMESPACE__ . '\\conditional_enqueue', 0);
 add_action('admin_footer', __NAMESPACE__ . '\\conditional_enqueue', 0);