[Tickets #10772] Kronolith incorrectly refuses to update attendee upon response

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Ticket URL: http://bugs.horde.org/ticket/10772
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  Ticket             | 10772
  Created By         | Ben Klang <bklang at horde.org>
  Summary            | Kronolith incorrectly refuses to update attendee upon
                     | response
  Queue              | Kronolith
  Version            | Git master
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Ben Klang <bklang at horde.org> (2011-11-17 00:16) wrote:

Using Kronolith I invited a friend to a meeting.  The friend, using  
Horde, replied using Kronolith.  I received the reply via IMP and  
attempted to update his status in the meeting.  Kronolith refused,  
saying "The attendee hasn't been updated because the update was not  
sent from the attendee."

I tracked the cause down to a mismatch between the expected sender and  
the observed sender.  Because I had invited my friend using only his  
email address his response was rejected.  The problem line of code is  
kronolith/lib/Api.php line 1388 which reads:

                 if (is_null($sender) || $sender_lcase == $attendee) {

In this case, $sender_lcase was "ben klang <bklang at horde.org>" and  
$attendee was "bklang at horde.org"