PstSource used to silently ignore CalImport.from/to (only Graph honored
a range) -- a long-lived mailbox has no natural upper bound on history,
so importing "everything" meant every recurring series expanded across
its full lifetime (up to 500 occurrences each) plus every one-off entry
the file ever held (e.g. a decade of Outlook's auto-generated yearly
holidays). Filters parsed events by starts_at after readpst parsing,
after collect_events -- doesn't need to touch how readpst is invoked or
how recurrence expansion works.
iamdoubz
8828fca805