[FIX] calendar: all day event

- Set the TZ as 'America/Martinique'
- In the calendar (month view), click on a date D.
- Fill in the topic, then click on "Edit"

The date is set to D-1.

Commit 09066fbbd5 makes the date consistent when the user sets an
event as an all day event by taking into account the appropriate
timezone.

However, in the case of an event created from the month view, this TZ
modification should not be applied.

opw-766638

addons/calendar/calendar.py

@@ -975,6 +975,7 @@ class calendar_event(osv.Model):
     def onchange_allday(self, cr, uid, ids, start=False, end=False, starttime=False, endtime=False, startdatetime=False, enddatetime=False, checkallday=False, context=None):
 
         value = {}
+        context = context or {}
 
         if not ((starttime and endtime) or (start and end)):  # At first intialize, we have not datetime
             return value
@@ -983,12 +984,18 @@ class calendar_event(osv.Model):
             startdatetime = startdatetime or start
             if startdatetime:
                 start = datetime.strptime(startdatetime, DEFAULT_SERVER_DATETIME_FORMAT)
-                value['start_date'] = fields.date.context_today(self, cr, uid, context=context, timestamp=start)
+                if context.get('default_allday'):
+                    value['start_date'] = datetime.strftime(start, DEFAULT_SERVER_DATE_FORMAT)
+                else:
+                    value['start_date'] = fields.date.context_today(self, cr, uid, context=context, timestamp=start)
 
             enddatetime = enddatetime or end
             if enddatetime:
                 end = datetime.strptime(enddatetime, DEFAULT_SERVER_DATETIME_FORMAT)
-                value['stop_date'] = fields.date.context_today(self, cr, uid, context=context, timestamp=end)
+                if context.get('default_allday'):
+                    value['stop_date'] = datetime.strftime(end, DEFAULT_SERVER_DATE_FORMAT)
+                else:
+                    value['stop_date'] = fields.date.context_today(self, cr, uid, context=context, timestamp=end)
         else:  # from date to datetime
             user = self.pool['res.users'].browse(cr, uid, uid, context)
             tz = pytz.timezone(user.tz) if user.tz else pytz.utc