Issue:
------
It is possible to create recurring events
that are in the same DST period.
Unfortunately, the basic event is sometimes duplicated
Cause:
------
The cause comes from the Daylight Saving Time (DST).
With the base event, we create a recurrence.
This recurrence will create all the events
of the recurrence.
To achieve this, with the basic event, we create all the ranges.
Then, we compare these ranges to remove those which already have
events.
Logically, we must reconcile the first range with the base event.
Sometimes the range of the base event and the first range
calculated to generate the occurrences do not match.
The consequence is the creation of a new event.
The cause of this problem is that we go back too far to find
the starting date of the period from which we will generate the ranges.
For example, in the case of a recurrence with a frequency of `MONTHLY`,
we will take the first date of the month.
And if we are in the month when the DST changes,
we will have the problem.
Solution:
---------
The solution is not to go back
if we encounter a difference in the DSTs
between the starting date of the base event
and the starting date for generating the ranges.
opw-3143680
closesodoo/odoo#119073
X-original-commit: 065dd4a2548ff0da6cf23a7ac62321ce99500d35
Signed-off-by: Arnaud Joset <arj@odoo.com>
Signed-off-by: Lefebvre Thomas (thle) <thle@odoo.com>
Thomas Lefebvre (thle)
9d5b4d218e