HTML API: Respect `tag_name` query arg in `HTML_Processor::next_tag()`

Previously the HTML Processor was ignoring the `tag_name` argument in
the `next_tag()` query if it existed. This was wrong adn would lead to
calling code finding the very next tag, regardless of tag name, instead
of the requested taag.

This patch adds the tag name detection code into `next_tag()` to fix
the bug and ensure that `next_tag()` always returns only when finding
a tag of the given name.

Developed in https://github.com/WordPress/wordpress-develop/pull/6980
Discussed in https://core.trac.wordpress.org/ticket/61581

Follow-up to [56274].

Fixes #61581.

Built from https://develop.svn.wordpress.org/trunk@58681


git-svn-id: http://core.svn.wordpress.org/trunk@58083 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/html-api/class-wp-html-processor.php

@@ -466,6 +466,10 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 					continue;
 				}
 
+				if ( isset( $query['tag_name'] ) && $query['tag_name'] !== $this->get_token_name() ) {
+					continue;
+				}
+
 				if ( isset( $needs_class ) && ! $this->has_class( $needs_class ) ) {
 					continue;
 				}

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58680';
+$wp_version = '6.7-alpha-58681';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.