Use RDATE as the origin of modified recurrence periods.
Preserve the period replacement status when editing.
client-editing-simplification
1# Local delivery to Cyrus: 2#local@$MAIL_DOMAIN lmtp:unix:/var/run/cyrus/socket/lmtp 3# Local delivery to Dovecot: 4#local@$MAIL_DOMAIN lmtp:unix:/var/run/dovecot/lmtp