block_core_navigation_get_submenu_visibility( array $attributes ): string

24function block_core_navigation_get_submenu_visibility( $attributes ) {25	$deprecated_open_submenus_on_click = $attributes['openSubmenusOnClick'] ?? null;26 27	// For backward compatibility, prioritize the legacy attribute if present.28	// Legacy blocks have openSubmenusOnClick in the database. Since WordPress applies29	// default values, submenuVisibility will also have a value, but we check the legacy30	// attribute first to preserve the original behavior. If the block has been updated31	// and saved in the editor, then the deprecated attribute will be replaced by submenuVisibility.32	if ( null !== $deprecated_open_submenus_on_click ) {33		// Convert boolean to string: true -> 'click', false -> 'hover'.34		return ! empty( $deprecated_open_submenus_on_click ) ? 'click' : 'hover';35	}36 37	$submenu_visibility = $attributes['submenuVisibility'] ?? null;38 39	// Use submenuVisibility for migrated/new blocks (where openSubmenusOnClick is null).40	return $submenu_visibility ?? 'hover';41}