[Tickets #10587] UI doesn't update after Purge Mailbox operation

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Ticket URL: http://bugs.horde.org/ticket/10587
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  Ticket             | 10587
  Created By         | Michael Rubinsky <mrubinsk at horde.org>
  Summary            | UI doesn't update after Purge Mailbox operation
  Queue              | IMP
  Version            | Git master
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Michael Rubinsky <mrubinsk at horde.org> (2011-09-30 17:36) wrote:

Dynamic view, after marking a handful of messages as deleted, then  
purging them, I get a status message saying the operation was  
successful, but the UI does not update to remove the deleted messages  
from the mailbox. When the mailbox refreshes with new messages, the  
deleted messages are properly removed.

The Ajax response from purge messages:
/*-secure-{"response":{"ViewPort":{"cacheid":"V1292457115|U58013|M120|1|1","view":"SU5CT1g"},"poll":{"SU5CT1g":0}},"msgs":[{"charset":"UTF-8","message":"1 message was purged from  
\"Inbox\".","flags":[],"type":"horde.success"}]}*/

No immediate messages in the horde log, though I occasionally still  
see the famous:

2011-09-30T13:32:04-04:00 WARN: HORDE [imp] PHP ERROR: json_encode():  
Invalid UTF-8 sequence in argument [pid 3866 on line 242 of  
"/usr/local/horde/horde/framework/Serialize/lib/Horde/Serialize.php"]