[Tickets #7689] Clean up recurrence exception edge cases

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Ticket URL: http://bugs.horde.org/ticket/7689
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  Ticket             | 7689
  Created By         | Chuck Hagenbuch <chuck at horde.org>
  Summary            | Clean up recurrence exception edge cases
  Queue              | Kronolith
  Version            | HEAD
  Type               | Bug
  State              | Assigned
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             | Horde Developers
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Chuck Hagenbuch <chuck at horde.org> (2008-11-14 23:45) wrote:

Right now, exceptions are not copied to a new event when Save As New  
is used. Also, changing the recur_end_date (or the start date) of a  
recurring event does not trim exceptions outside the new range.

I can see situations where trimming exceptions would result in what  
would be considered data loss, but I think the consistent thing to do  
would be:
1. when saving a recurring event, delete recurrence exceptions outside  
the event's range
2. when saving a recurring event As New, copy over recurrences inside  
the new range.

I think 2. is a must; I could be convinced to drop 1.