Wikimedia Bugzilla is closed!

I have a database that contains several titles with unicode non-breaking spaces.  The following query shows 13 rows:

mysql> select page_id, page_title from page where page_title like CONCAT('%', convert(unhex('c2a0') using utf8), '%');

CKEditor used to be used on this wiki and I suspect it is to blame.  These pages aren't accessible in the wiki, but they do turn up search results.

Converting the rows so that the character is replaced with "_" makes the page accessible.

A conversion should probably be performed by upgrade.php.