Editor: Support filtering arguments in block type registration from metadata

Adds 2 new hooks in `register_block_type_from_metadata`:

- Named `block_type_metadata` to filter the content of metadata read from `block.json`
- Named `block_type_metadata_settings` to filter the settings object determined from the metadata that is passed to `register_block_type` call

Props swissspidy.
Fixes #52138.


Built from https://develop.svn.wordpress.org/trunk@49948


git-svn-id: http://core.svn.wordpress.org/trunk@49647 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/blocks.php

@@ -201,6 +201,15 @@ function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
 	}
 	$metadata['file'] = $metadata_file;
 
+	/**
+	 * Filters the metadata provided for registering a block type.
+	 *
+	 * @since 5.7.0
+	 *
+	 * @param array $metadata Metadata for registering a block type.
+	 */
+	$metadata = apply_filters( 'block_type_metadata', $metadata );
+
 	$settings          = array();
 	$property_mappings = array(
 		'title'           => 'title',
@@ -252,12 +261,26 @@ function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
 		);
 	}
 
-	return register_block_type(
-		$metadata['name'],
+	/**
+	 * Filters the settings determined from the block type metadata.
+	 *
+	 * @since 5.7.0
+	 *
+	 * @param array $settings Array of determined settings for registering a block type.
+	 * @param array $metadata Metadata provided for registering a block type.
+	 */
+	$settings = apply_filters(
+		'block_type_metadata_settings',
 		array_merge(
 			$settings,
 			$args
-		)
+		),
+		$metadata
+	);
+
+	return register_block_type(
+		$metadata['name'],
+		$settings
 	);
 }
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-49947';
+$wp_version = '5.7-alpha-49948';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.