HTML API: Check tag namespace in ::set_modifiable_text().

The method should only apply to special "atomic" HTML tags like `SCRIPT` or `TEXTAREA`. `::set_modifiable_text()` should not apply to tags with the same name in other namespaces.

Developed in WordPress/wordpress-develop#11083.

Props jonsurrell, dmsnell, westonruter.
Fixes #64751.

Built from https://develop.svn.wordpress.org/trunk@61796


git-svn-id: http://core.svn.wordpress.org/trunk@61102 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: sirreal

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

@@ -3817,7 +3817,14 @@ public function set_modifiable_text( string $plaintext_content ): bool {
 			return true;
 		}
 
-		if ( self::STATE_MATCHED_TAG !== $this->parser_state ) {
+		/*
+		 * The rest of this function handles modifiable text for special "atomic" HTML elements.
+		 * Only tags in the HTML namespace should be processed.
+		 */
+		if (
+			self::STATE_MATCHED_TAG !== $this->parser_state ||
+			'html' !== $this->get_namespace()
+		) {
 			return false;
 		}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-beta2-61795';
+$wp_version = '7.0-beta2-61796';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.