[Pidgin] #15700: Rejection of Invitation is not sent to XMPP service in multi user chat protocol

[Pidgin]

#15700: Rejection of Invitation is not sent to XMPP service in multi user chat
protocol
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 Reporter:  seven777777  |      Owner:  deryni
     Type:  defect       |     Status:  new
Milestone:  2.10.8       |  Component:  XMPP
  Version:  2.10.7       |   Keywords:  multiuserchat muc rooms groupchat
                         |  invitation rejection decline
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 I am using Pidgin as a client for a xmpp multi user chat protocol, i.e
 muc.
 There is problem with invitation management that is done by Pidgin.

 The case is following.
 User 1 has joined a room and he invites User 2 to join the same room.
 User 2 receives the invitation and a dialog apperas asking to Accept chat
 invitation.
 At this point User 2 has two options, accept or reject(cancel).
 If user 2 accepts the invitation, he is joined to the room and can start
 chating. It is all ok.
 But if he does not accept, then nothing the dialog is closed but user 1
 does not know if his invitation was rejected.

 And I found that invitation rejection message is not sent by Pidgin to
 XMPP server by using XMPP debug/console plugin, which comes with Pidgin.

 The reject message that should be sent by pidgin to the service is
 described in [http://xmpp.org/extensions/xep-0045.html] Example 58.
 Invitee Declines Invitation

 Thank you

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Ticket URL: <https://developer.pidgin.im/ticket/15700>
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