Wikimedia Bugzilla is closed!

If a sysop doesn't want a user can change his realname (because its set by extend authPlugin) and adds a allowRealNameChange(), which returns false, to the AuthPlugin.php, you get a php notice "Undefined index: realname in Preferences.php line 1439".

If allowPropChange() or allowRealNameChange() from AuthPlugin.php return false then there is a missing key 'realname' in $formData. 
This causes the mentioned warning and an empty realname string for the user. 
This should either be checked before saving or the index should include the old realname by default.

Workaround for me: Edit Preferences.php like this:

Preferences.php line 1436
// Fortunately, the realname field is MUCH simpler
// (not really "private", but still shouldn't be edited without permission)
  if ( !in_array( 'realname', $wgHiddenPrefs ) && $user->isAllowed( 'editmyprivateinfo' ) ) {
    if (!array_key_exists('realname', $formData)) {
      $formData['realname'] = $user->getRealname();
    }

    $realName = $formData['realname'];
    $user->setRealName( $realName );
  }


Message in error.log:
PHP Notice:  Undefined index: realname in /srv/web/wiki.xxxxxx.org/public/mediawiki-1.22.2/includes/Preferences.php on line 1439, referer: http://wiki.xxxxxx.org/wiki/Spezial:Einstellungen