Recurring event: only date changes should reset recurring event exceptions

[chibenwa]

oups-2025-11-24_12.14.04.mp4

Acual behaviour:

WHEN a recurring event with exception is edited (all events) (title)
THEN all the exceptions are cnaelled

Expected behaviour

WHEN a recurring event with exception is edited (all events) (title)
THEN all the exceptions are kept
AND all titles are updated

WHEN a recurring event with exception is edited (all events) (time)
THEN all the exceptions are canceled
AND the master event is updated