Slide into the INSERTION MODE when parsing PLAINTEXT

Author: dmsnell

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

@@ -163,7 +163,7 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 *
 	 * @var WP_HTML_Processor_State
 	 */
-	private $state;
+	protected $state;
 
 	/**
 	 * Used to create unique bookmark names.

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

@@ -975,7 +975,7 @@ private function base_class_next_token(): bool {
 		}
 
 		if ( 'PLAINTEXT' === $tag_name ) {
-			if ( WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT === ( $this->insertion_mode ?? null ) ) {
+			if ( WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT === ( $this->state->insertion_mode ?? null ) ) {
 				return true;
 			}