[horde] "Purge Deleted" action in Dynamic view does not refresh the message list

[delfreoa at gmail.com]

Hello,
My version of horde is:
Horde Groupware Webmail Edition 5.1.1
I have the same problem described in the following ticket
http://bugs.horde.org/ticket/11143

If I delete a message in a folder and then go to Other -> "Purge
Deleted", the list of messages is not updated, then if I click to
"refresh" and the list of messages is updated.

How can I fix this?

Thanks for your support
Alessandro