[FIX] calendar: do not try to read virtual ids from database

Try to access a recurring event.
The _search function defined in mail_message tries to read records,
building a list of ids.
They are given to the _search of calendar, which builds its custom SQL query
using the data it received.
Since it got recurring ids instead of real ones, we get:
SELECT id, ("calendar_event"."id" in (101,'101-2019011118000...
Bug introduced in f74f5edc77.

If we get such a request, we convert the virtual ids back to real ids.
Note that a similar conversion was done in calendar's override of "mail.message"
_search method, 'in the case it was asked on virtual ids'.

Note that as of this commit making messages on virtual_ids doesn't even work,
so it is possible that this mess was introduced for the chatter feature,
which has been broken before, and so all of it is useless.

closes #27474
closes #28288
closes #28621
opw 1928562
opw 1930763
opw 1935148

closes odoo/odoo#30827

addons/calendar/models/calendar.py

@@ -1129,6 +1129,9 @@ class Meeting(models.Model):
             select_fields = ["id"]
             where_params_list = []
             for pos, arg in enumerate(domain):
+                # hack: if we received recurrent ids, we need to clean them
+                if arg[0] == 'id' and arg[1] in ('in', 'not in'):
+                    arg = (arg[0], arg[1], [calendar_id2real_id(id) for id in arg[2]])
                 if not arg[0] in ('start', 'stop', 'final_date', '&', '|'):
                     e = expression.expression([arg], self)
                     where_clause, where_params = e.to_sql()  # CAUTION, wont work if field is autojoin, not supported