Implement in_select_scope via …in_specific_scope

src/wp-includes/html-api/class-wp-html-open-elements.php

@@ -156,11 +156,15 @@ public function current_node() {
 	 *
 	 * @see https://html.spec.whatwg.org/#has-an-element-in-the-specific-scope
 	 *
-	 * @param string   $tag_name         Name of tag check.
-	 * @param string[] $termination_list List of elements that terminate the search.
+	 * @param string   $tag_name             Name of tag check.
+	 * @param string[] $termination_list     List of elements that terminate the search.
+	 * @param string   $termination_behavior Optional. "include" or "exclude". If "include"
+	 *                                       (default), the terminate when any tag in
+	 *                                       `$termination_list` is reached. Otherwise,
+	 *                                       terminate when any _other_ tag is reached.
 	 * @return bool Whether the element was found in a specific scope.
 	 */
-	public function has_element_in_specific_scope( $tag_name, $termination_list ) {
+	public function has_element_in_specific_scope( $tag_name, $termination_list, $termination_behavior = 'include' ) {
 		foreach ( $this->walk_up() as $node ) {
 			if ( $node->node_name === $tag_name ) {
 				return true;
@@ -178,7 +182,10 @@ public function has_element_in_specific_scope( $tag_name, $termination_list ) {
 					return false;
 			}
 
-			if ( in_array( $node->node_name, $termination_list, true ) ) {
+			$terminate = 'include' === $termination_behavior
+				? in_array( $node->node_name, $termination_list, true )
+				: ! in_array( $node->node_name, $termination_list, true );
+			if ( $terminate ) {
 				return false;
 			}
 		}
@@ -283,20 +290,11 @@ public function has_element_in_table_scope( $tag_name ) {
 	 * @return bool Whether given element is in scope.
 	 */
 	public function has_element_in_select_scope( $tag_name ) {
-		foreach ( $this->walk_up() as $node ) {
-			if ( $node->node_name === $tag_name ) {
-				return true;
-			}
-
-			if (
-				'OPTION' !== $node->node_name &&
-				'OPTGROUP' !== $node->node_name
-			) {
-				return false;
-			}
-		}
-
-		return false;
+		return $this->has_element_in_specific_scope(
+			$tag_name,
+			array( 'OPTION', 'OPTGROUP' ),
+			'exclude'
+		);
 	}
 
 	/**