Please describe the problem:
I created a group appointment and sent invitations. One of the responses had a wrong sender. This triggered a dialog with this text (see attachment also):

Diese Antwort stammt nicht von einem der aktuellen Teilnehmer. Soll der Absender als Teilnehmer hinzugefügt werden?

My Translation: This reply does not come from one of the current participants. Shall the sender be added as a participant?

The button only features an "OK" button, so I cannot answer this question properly. I clicked on it and the other sender has not been added to the list of participants.


Steps to reproduce:
1. Create a new appointment

2. Right click the appointment and select "Besprechung ansetzen..." (my translation: "Schedule meeting...")

3. Enter a mail address for which the reply address will be different.

4. On the receiving mail account accept the invitation but make sure that the confirmation will be sent with a different sender address than the one you typed in step 3, e.g. due to domain canonicalization like "scooter-attack" instead of "scooterattack" or a mail forwarder.

5. when receiving the confirmation click on "Teilnehmerstatus aktualisieren" (my translation: "Update participant's status" and you will get the message

BTW: I tried to reproduce this with KMail, but KMail notices the different address and asks me which one to use for the reply.

Actual results:
I get a yes/no question with only an OK, button

Expected results:
I get a yes/no question with a YES and a NO button

Does this happen every time?
yes

Other information:
There is an Ubuntu bug

https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/330601

within someone posted this comment:

that seems to not work in jaunty, the dialog is not displayed, looking at the code though

" dialog = gtk_message_dialog_new (
      NULL, GTK_DIALOG_MODAL,
      GTK_MESSAGE_QUESTION,
      GTK_BUTTONS_YES_NO,
      "%s", _("This response is not from a "
      "current attendee. Add as an attendee?"));"

the GTK_BUTTONS_YES_NO is used so it should display "yes" and "no" dialog, the intrepid code already had that