Fix possible collision in generated thumbnail cache key (#1489069)

Aleksander Machniak

2013-04-26 ecc1b3bd5e8d366815b39a5455a267c9f4ad6a19

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<?php
 
// Help content iframe source
// $rcmail_config['help_source'] = 'http://trac.roundcube.net/wiki';
$rcmail_config['help_source'] = '';