Formatting: Strip object replacement characters from slugs.

This changeset prevents object replacement characters – UTF-8 `%ef%bf%bc`, used as a placeholder in text for an otherwise unspecified object – from being added to slugs.

Props cantuaria, costdev, audrasjb, SergeyBiryukov, archon810, maciejmackowiak, BaneD, markparnell, ironprogrammer, dmsnell, nikkigagency, webprom.
Fixes #55117.


git-svn-id: https://develop.svn.wordpress.org/trunk@54474 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/formatting.php

@@ -2329,6 +2329,7 @@ function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'displa
 				'%e2%80%ad', // Left-to-right override.
 				'%e2%80%ae', // Right-to-left override.
 				'%ef%bb%bf', // Byte order mark.
+				'%ef%bf%bc', // Object replacement character.
 			),
 			'',
 			$title