[Tickets #10724] Prompt user to send updates when modifying an event with attendees

[bugs at horde.org]

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Ticket URL: http://bugs.horde.org/ticket/10724
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  Ticket             | 10724
  Created By         | Ben Klang <bklang at horde.org>
  Summary            | Prompt user to send updates when modifying an event
                     | with attendees
  Queue              | Kronolith
  Version            | Git master
  Type               | Enhancement
  State              | New
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Ben Klang <bklang at horde.org> (2011-11-08 19:25) wrote:

When modifying an event that has invited participants, by default  
Horde sends no update when the details of the event change.  This is  
especially true when dragging the event in the AJAX UI, but is also  
true when editing event details via dialog box.  The only way to  
override this is to click the Attendees tab and then check the box  
"Send invites to all attendees" but this is problematic for two reasons:
1) It is not obvious (the user has to go out of his way to find the  
box, assuming he knows it is there)
2) The label makes it sound like it will result in a brand new invite  
rather than an updated invite

I propose that we alter the UI to prompt the user whether to send an  
invitation to attendees when altering an event.  This follows the  
behavior of other calendar clients.  I have attached screenshots for  
how this appears in Thunderbird (with the Lightning plugin), Google  
Calendar and iCal.

For Horde, I propose 3 actions on the prompt presented to the user:

1) "Send" (update all invited participants)
2) "Do not send" (update the event but do not send any updates)
3) "Cancel Changes" (do not update the event and do not send any updates)