[kronolith] free periods generation

[Cédric Parent]

Hello,
when adding attendees to an event, I have a little problem in the free
periods generated.
I have a contact who have overlapped events, like this:

     |----------|
              |----------|

The non-available period is correct:
     |-------------------|

But the free periods looks like this (without considering the second
event):
  ---|          |-----------

When we parse the second event, we have to extend the existing free
period instead of generating a new one.
Here is a patch to framework/iCalendar/iCalendar/vfreebusy.php :

154c154,156
<                 $periods[$nextstart] = min($start, $endStamp);
---
>                 if ($nextstart<=$start) {
>                     $periods[$nextstart] = min($start, $endStamp);
>                 }



Cédric