[FIX] calendar: keep recurring after edited one

Since 76b7242 if we have a recurring event with 3 occurences:

 [4th 4:00-4th 5:00] [14th 4:00-14th 5:00] [24th 4:00-24th 4:00]

And we detach the first one to modify it, then when getting the
info of reccurring events not detached the system get:

- starts: [14th 4:00] [24th 4:00]
- stops: [4th 5:00] [14th 5:00] [24th 5:00]

And wrongly apply the current filtering over:

 [14th 4:00-4th 5:00] [24th 4:00-14th 5:00]

So the issue hides recurrences of event wrongly if:

- they have not been detached
- they don't have a duration of 0
- one or several previous events have been detached
- the stop date of the nth previous event occurrence (nth equaling
  number of detached previous events) is not in the current filtering.

With this change, the stops are also filtered based on start of
occurrence + duration.

Without the change, the added test fails with:

 False != '155-20120301120100' : Last event should be found searching it by date range

note: for 10.0 up to not including 11.0 which is solved with #26901

opw-1866151
closes #26887

addons/calendar/models/calendar.py

@@ -563,7 +563,10 @@ class Meeting(models.Model):
         recurring_meetings = self.search([('recurrent_id', '=', self.id), '|', ('active', '=', False), ('active', '=', True)])
 
         for meeting in recurring_meetings:
-            rset1._exdate.append(todate(meeting.recurrent_id_date))
+            date = todate(meeting.recurrent_id_date)
+            if date_field == 'stop':
+                date = date + timedelta(hours=self.duration)
+            rset1._exdate.append(date)
         return [d.astimezone(pytz.UTC) if d.tzinfo else d for d in rset1]
 
     @api.multi

addons/calendar/tests/test_calendar_recurrent_event_case2.py

@@ -85,14 +85,23 @@ class TestRecurrentEvent(common.TransactionCase):
         for meeting in meetings:
             self.assertEqual(meeting.name, 'Sprint Review for google modules', 'Name not changed for id: %s' % meeting.id)
 
+        # I detach first occurrence to check it is not modified by changing recurrent event.
+        min(meetings, key=lambda m: m.start).detach_recurring_event()
+
         # I change description of my weekly meeting Review code with programmer.
         idval = '%d-%s' % (self.calendar_event_sprint_review.id, '20110425124700')
         self.CalendarEvent.browse(idval).write({'description': 'Review code of the module: sync_google_calendar.'})
 
-        # I check whether that all the records of this recurrence has been edited.
-        meetings = self.CalendarEvent.search([('recurrent_id', '=', self.calendar_event_sprint_review.id)])
-        for meeting in meetings:
-            self.assertEqual(meeting.description, 'Review code of the module: sync_google_calendar.', 'Description not changed for id: %s' % meeting.id)
+        # I check that detached event has not been edited.
+        detached_meeting = self.CalendarEvent.search([('recurrent_id', '=', self.calendar_event_sprint_review.id)])
+        self.assertEqual(detached_meeting.description, False, 'Detached event description changed for id: %s' % meeting.id)
+
+        # I verify wether I find an event by date range when subsequent to a detached one.
+        last_meeting = max(meetings, key=lambda m: m.start)
+        meetings = self.CalendarEvent.with_context({'virtual_id': True}).search([
+            ('start', '<=', last_meeting.stop), ('stop', '>=', last_meeting.start)
+        ])
+        self.assertEqual(meetings.id, last_meeting.id, 'Last event should be found searching it by date range')
 
         # I update the description of two meetings, and check that both have been updated
         self.calendar_event_sprint_review.write({'description': "Some description"})