project: roundcube-kolab-plugins calendar

1. Create a event that repeats daily (from monday to sunday) with 30 minutes duration
2. Edit only the second event start time to 2 hours late
3. Select the 3rd event and click to edit all events.
4. Change start time to 1 hour late
5. Select the 2nd event and click to edit all future events
6. Set start time to 1 hour late
7. Some events are missing and I think that a event moved from recurrence shuldn't be recurrent anymore...

I tested it on the last commit from today (around 10:40 AM)

Looks like the problem is in _update_recurring() method from plugins/calendar/drivers/database_driver.php.