Inviting a circle does not resolve its members

[st3iny]

Steps to reproduce

1. Create a circle with some users (which have email addresses).
2. Create an event and invite said circle.
3. Save the event.
4. Export it

Observe, that the ICS contains a single, strange attendee, e.g.:

ATTENDEE;CN=invite-test;CUTYPE=GROUP;PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICI
 PANT;RSVP=TRUE;SCHEDULE-STATUS=5.0:mailto:circle+RQzSHWoHKpZAT67fCOWstupXE
 cStZfN@

Is this intended behavior, i.e. is the circle not supposed to be resolved?

Ref #5420

Expected behavior

A circle's member should be resolved and added to the event directly. At least, if members are users with email addresses. Otherwise, scheduling won't work.

Actual behavior

There is a single attendee with a cryptic, malformed email address.

Calendar app version

main, stable5.1, c.nc.c

[st3iny]

Nope, that looks like a bug. The members should be resolved. Quoting the original PR:

Members of the circle will be imported as standard attendees. Each member gets
assigned to the circle group entry by assigning them to the group uri using the
iCal member property: "MEMBER='mailto:circle+CIRCLEID@CIRCLE_INSTANCE'".

Circles added to the list of attendees get imported only once and are not
synced yet. While adding a circle, a notice about this is shown to the user.
Only members of local circles which are local users get imported.