Indexing problem for recurring events

[pgrunewald]

If an event has an occurrence which overlaps the event one index entry is invalid.

Steps to reproduce:
Add an event with the following properties:

• start: 15/02/2016 15:00
• end: 16/02/2016 16:00
• recurrence rule: RRULE:FREQ=DAILY;UNTIL=20160217T000000

In this case the start of the first occurrence is before the end of the event. The catalog shows for this event three entries for the start index and two entries for the end index. Normally the end index for this event should have three entries.

Versions:
plone.app.event = 1.1.4 (using with [archetypes] option)
plone.formwidget.recurrence = 2.0.1
plone.formwidget.datetime = 1.1
Plone 4.3.7