fix(recurring until): don't change recurring until and include last instance

[GuillaumeDecMeetsMore]

Changed

• Fix recurring_until not reset when recurring is reset
• Fix recurring_until modified when it's set - better to keep the value we receive, and instead do the following ⬇️
  • (original change: fix: add duration to recurring_until #290)
• Fix recurring_until not being inclusive for all queries
  • If a recurring event has a recurring_until that goes until the start of the timespan we are searching (e.g. we are searching from 07/20 00:00 to 07/27 00:00, and the recurring event is everyday at 00:00 for 1h with a recurring_until at 07/20 00:00, then we should include the recurring event as the last instance 07/20 00:00 => 07/20 01:00 should be generated)
  • https://datatracker.ietf.org/doc/html/rfc5545 ("The UNTIL rule part defines a DATE or DATE-TIME value that bounds
    the recurrence rule in an inclusive manner.")

Edit: this doesn't work as, if we are searching from 07/20 00:30 to 07/27 00:30, we are missing the recurring event, even though there are 30minutes still impacting our time range...

[GuillaumeDecMeetsMore]

Closing