Add behaviors to the VALID_SETTINGS in class-wp-theme-json-gutenberg.php

Author: michalczaplinski

lib/class-wp-theme-json-gutenberg.php

@@ -404,6 +404,9 @@ class WP_Theme_JSON_Gutenberg {
 			'textDecoration' => null,
 			'textTransform'  => null,
 		),
+		'behaviors' => array(
+			'lightbox' => null,
+		),
 	);
 
 	/**