Before this task, lots of mails were sent after updating or deleting recurrent event in 'All events' or 'This and future events' update type. This was happening because updating these recurrent events was triggering patch calls event by event, when they should be handled in batch. After this commit, updating or deleting recurrent events should trigger at most two mails for Google users. closes odoo/odoo#137607 Task-id: 3163695 X-original-commit: ad2106babda61446bce13283d570dc723418b630 Signed-off-by: Arnaud Joset (arj) <arj@odoo.com> Signed-off-by: Gabriel de Paula Felix (gdpf) <gdpf@odoo.com>