HTML API: Fix three small type-related bugs.

This applies three fixes that appeared as part of
adding type annotations to the HTML API.

Developed in #6754
Discussed in https://core.trac.wordpress.org/ticket/61399

Props jonsurrell.
See #61399.
Follow-up to [55203], [56274].


git-svn-id: https://develop.svn.wordpress.org/trunk@58364 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -543,7 +543,7 @@ public function next_token() {
 		// Avoid sending close events for elements which don't expect a closing.
 		if (
 			WP_HTML_Stack_Event::POP === $this->current_element->operation &&
-			! static::expects_closer( $this->current_element->token->node_name )
+			! static::expects_closer( $this->current_element->token )
 		) {
 			return $this->next_token();
 		}

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

@@ -2265,7 +2265,7 @@ private function class_name_updates_to_attributes_updates() {
 	 * @param int $shift_this_point Accumulate and return shift for this position.
 	 * @return int How many bytes the given pointer moved in response to the updates.
 	 */
-	private function apply_attributes_updates( $shift_this_point = 0 ) {
+	private function apply_attributes_updates( $shift_this_point ) {
 		if ( ! count( $this->lexical_updates ) ) {
 			return 0;
 		}
@@ -2787,6 +2787,8 @@ public function get_token_name() {
 			case self::STATE_FUNKY_COMMENT:
 				return '#funky-comment';
 		}
+
+		return null;
 	}
 
 	/**
@@ -3195,7 +3197,7 @@ public function get_updated_html() {
 		 * Keep track of the position right before the current tag. This will
 		 * be necessary for reparsing the current tag after updating the HTML.
 		 */
-		$before_current_tag = $this->token_starts_at;
+		$before_current_tag = $this->token_starts_at ?? 0;
 
 		/*
 		 * 1. Apply the enqueued edits and update all the pointers to reflect those changes.