Block Library: Add filter for inner blocks in the Navigation block (#…

…37998)

* add filter to $inner_blocks

* remove extra line space

* Apply suggestions from code review

* Update index.php

Co-authored-by: Greg Ziółkowski <grzegorz@gziolo.pl>

packages/block-library/src/navigation/index.php

@@ -502,9 +502,18 @@ function render_block_core_navigation( $attributes, $content, $block ) {
 		}
 
 		$inner_blocks = new WP_Block_List( $fallback_blocks, $attributes );
-
 	}
 
+	/**
+	 * Filter navigation block $inner_blocks.
+	 * Allows modification of a navigation block menu items.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param \WP_Block_List $inner_blocks
+	 */
+	$inner_blocks = apply_filters( 'block_core_navigation_render_inner_blocks', $inner_blocks );
+
 	$layout_justification = array(
 		'left'          => 'items-justified-left',
 		'right'         => 'items-justified-right',