Refactor comments in resolve_pattern_blocks function for clarity

Improves the documentation within the `resolve_pattern_blocks` function by enhancing comments related to metadata handling for single-root patterns. This change aims to provide clearer guidance on the merging process of pattern metadata with existing block metadata.

Author: ramonjd

src/wp-includes/blocks.php

@@ -1883,31 +1883,29 @@ function resolve_pattern_blocks( $blocks ) {
 
 			$blocks_to_insert = parse_blocks( trim( $pattern['content'] ) );
 
-			$blocks_to_insert = parse_blocks( trim( $pattern['content'] ) );
-
 			/*
-			* For single-root patterns, add the pattern name to make this a pattern instance in the editor.
-			* If the pattern has metadata, merge it with the existing metadata.
-			*/
+			 * For single-root patterns, add the pattern name to make this a pattern instance in the editor.
+			 * If the pattern has metadata, merge it with the existing metadata.
+			 */
 			if ( count( $blocks_to_insert ) === 1 ) {
 				$block_metadata                = $blocks_to_insert[0]['attrs']['metadata'] ?? array();
 				$block_metadata['patternName'] = $slug;
 
 				/*
-				* Merge pattern metadata with existing block metadata.
-				* Pattern metadata takes precedence, but existing block metadata
-				* is preserved as a fallback when the pattern doesn't define that field.
-				* Only the defined fields (name, description, categories) are updated;
-				* other metadata keys are preserved.
-				*/
+				 * Merge pattern metadata with existing block metadata.
+				 * Pattern metadata takes precedence, but existing block metadata
+				 * is preserved as a fallback when the pattern doesn't define that field.
+				 * Only the defined fields (name, description, categories) are updated;
+				 * other metadata keys are preserved.
+				 */
 				foreach ( array(
 					'name'        => 'title', // 'title' is the field in the pattern object 'name' is the field in the block metadata.
 					'description' => 'description',
 					'categories'  => 'categories',
 				) as $key => $pattern_key ) {
 					$value = $pattern[ $pattern_key ] ?? $block_metadata[ $key ] ?? null;
 					if ( $value ) {
-						$block_metadata[ $key ] = 'categories' === $key && is_array( $value )
+						$block_metadata[ $key ] = is_array( $value )
 							? array_map( 'sanitize_text_field', $value )
 							: sanitize_text_field( $value );
 					}