https://bugzilla.wikimedia.org/show_bug.cgi?id=64396

            Bug ID: 64396
           Summary: Titles with non-breaking spaces aren't converted to
                    underscores in upgrades
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
          Assignee: [email protected]
          Reporter: [email protected]
       Web browser: ---
   Mobile Platform: ---

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.

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