### Steps to reproduce

1. Create a meeting series that starts tomorrow 10 AM

2. Finish the template so that tomorrow 10 AM meeting is open

3. On the series show page, click more menu -> edit series

4. Reschedule the series to 9 AM


### What is the buggy behavior?

_Please describe the bug in as much detail as possible. Example:_

* You now have two open meetings, one for the old, one for the new time

* If you export this ICS, it will contain the two meetings with invalid RECURRENCE-ID, which will cause errors in groupwares, at least mailbox.org


### What is the expected behavior?

_Describe how the application should behave like. Example:_

1. Begin of the insertionAll _n_End of the insertion Begin of the deletion You only have oneEnd of the deletion open Begin of the insertionmeetings in the future will be rescheduled according ot the next _n_ planned meetings according to the new series schedule. Even if moving from daily to monthly, or weekly to daily.End of the insertion Begin of the deletion agendaEnd of the deletion

2. Begin of the insertionIfEnd of the insertion Begin of the deletion Open meetings are moved toEnd of the deletion the Begin of the insertionuser changes the # occurences so that it's fewer than actual open occurences, then you get an inline validation in the meeting details dialog.End of the insertion Begin of the deletion closest matching scheduleEnd of the deletion


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