Stop Drupal from shortening long usernames

drupal shortening long usernames

http://lists.drupal.org/pipermail/support/2007-June/005042.html

If you wanted to override this, you could define a new function in

the template.php file of your theme. To do this, simply copy the of
the existing function from <http://api.drupal.org/api/5/function/
theme_username> and rename it to your-theme's-name_username. Then
depending on what you want to do, you could simply comment out the line

$name = drupal_substr($object->name, 0, 15) .'...';

or change the value (15) to something long enough to allow the user's
name to not be truncated.