fix(calendar-sync): drop singly-declined recurring occurrences

Declining one occurrence of a recurring meeting left it on the agenda. Google emits that decline as a RECURRENCE-ID override carrying the user's PARTSTAT=DECLINED. But calendar-sync--parse-exception-event never read the override's attendee block, so the occurrence kept the series' inherited "accepted" status and the declined filter never dropped it. The apply side already re-derives status from an override's attendees. The parse side just wasn't supplying them.

The fix parses the override's ATTENDEE lines into :attendees, the same way parse-event does. A unit test covers the extraction. An integration test runs the full parse/apply/filter chain on a declined week.

2 files changed, 66 insertions, 0 deletions

diff --git a/tests/test-calendar-sync--parse-exception-event.el b/tests/test-calendar-sync--parse-exception-event.el
index 1935d3eb..a26a7418 100644
--- a/tests/test-calendar-sync--parse-exception-event.el
+++ b/tests/test-calendar-sync--parse-exception-event.el
@@ -47,6 +47,28 @@
          (event (test-calendar-sync-make-vevent "Regular Event" start end)))
     (should-not (calendar-sync--parse-exception-event event))))
 
+;;; Normal Cases — attendee extraction (singly-declined occurrence)
+
+(ert-deftest test-calendar-sync--parse-exception-event-extracts-attendees ()
+  "Normal: a RECURRENCE-ID override carrying an ATTENDEE block parses :attendees,
+so a singly-declined occurrence can have its user status re-derived downstream
+by `calendar-sync--apply-single-exception'."
+  (let* ((start (test-calendar-sync-time-days-from-now 7 10 0))
+         (end (test-calendar-sync-time-days-from-now 7 11 0))
+         (event (concat "BEGIN:VEVENT\n"
+                        "UID:override@google.com\n"
+                        "RECURRENCE-ID:20260203T090000Z\n"
+                        "SUMMARY:1:1 with Hayk\n"
+                        "ATTENDEE;CN=Craig;PARTSTAT=DECLINED:mailto:craig@example.com\n"
+                        "DTSTART:" (test-calendar-sync-ics-datetime start) "\n"
+                        "DTEND:" (test-calendar-sync-ics-datetime end) "\n"
+                        "END:VEVENT"))
+         (plist (calendar-sync--parse-exception-event event))
+         (attendees (plist-get plist :attendees)))
+    (should attendees)
+    (should (equal "craig@example.com" (plist-get (car attendees) :email)))
+    (should (equal "DECLINED" (plist-get (car attendees) :partstat)))))
+
 ;;; Error Cases
 
 (ert-deftest test-calendar-sync--parse-exception-event-error-unparseable-times ()
diff --git a/tests/test-integration-calendar-sync-recurrence-exceptions.el b/tests/test-integration-calendar-sync-recurrence-exceptions.el
index 0a9b5af1..dde0603a 100644
--- a/tests/test-integration-calendar-sync-recurrence-exceptions.el
+++ b/tests/test-integration-calendar-sync-recurrence-exceptions.el
@@ -162,5 +162,49 @@ Weekly meeting with one instance rescheduled from 09:00 to 10:00."
     (should (string-match-p "10:00" org-output))
     (should (string-match-p "15:00" org-output))))
 
+(ert-deftest test-integration-declined-single-occurrence-is-dropped ()
+  "A recurring event with one occurrence declined via a RECURRENCE-ID override
+is filtered out end-to-end, while the other occurrences survive.
+
+This is the singly-declined-occurrence case: declining one instance of a series
+in Google Calendar emits a RECURRENCE-ID override carrying the user's
+PARTSTAT=DECLINED.  The override must carry its attendee block all the way from
+`calendar-sync--parse-exception-event' through
+`calendar-sync--apply-single-exception' (status re-derivation) to
+`calendar-sync--filter-declined' for the drop to happen."
+  (let* ((calendar-sync-skip-declined t)
+         (calendar-sync-user-emails '("craig@example.com"))
+         (base-start (test-calendar-sync-time-days-from-now 0 9 0))
+         (base-end (test-calendar-sync-time-days-from-now 0 10 0))
+         (rec-id (test-calendar-sync-time-days-from-now 7 9 0))
+         (decl-start (test-calendar-sync-time-days-from-now 7 9 0))
+         (decl-end (test-calendar-sync-time-days-from-now 7 10 0))
+         (ics-content
+          (concat "BEGIN:VCALENDAR\n"
+                  "VERSION:2.0\n"
+                  "BEGIN:VEVENT\n"
+                  "UID:1on1@google.com\n"
+                  "SUMMARY:1on1 with Hayk\n"
+                  "DTSTART:" (test-calendar-sync-ics-datetime-local base-start) "\n"
+                  "DTEND:" (test-calendar-sync-ics-datetime-local base-end) "\n"
+                  "RRULE:FREQ=WEEKLY;COUNT=4\n"
+                  "END:VEVENT\n"
+                  ;; Week 2 declined: RECURRENCE-ID override with PARTSTAT=DECLINED
+                  "BEGIN:VEVENT\n"
+                  "UID:1on1@google.com\n"
+                  "RECURRENCE-ID:" (test-calendar-sync-ics-datetime-local rec-id) "\n"
+                  "SUMMARY:1on1 with Hayk DECLINEDWEEK\n"
+                  "ATTENDEE;CN=Craig;PARTSTAT=DECLINED:mailto:craig@example.com\n"
+                  "DTSTART:" (test-calendar-sync-ics-datetime-local decl-start) "\n"
+                  "DTEND:" (test-calendar-sync-ics-datetime-local decl-end) "\n"
+                  "END:VEVENT\n"
+                  "END:VCALENDAR"))
+         (org-output (calendar-sync--parse-ics ics-content)))
+    (should (stringp org-output))
+    ;; The non-declined occurrences survive.
+    (should (string-match-p "1on1 with Hayk" org-output))
+    ;; The declined occurrence (unique marker) is dropped.
+    (should-not (string-match-p "DECLINEDWEEK" org-output))))
+
 (provide 'test-integration-calendar-sync-recurrence-exceptions)
 ;;; test-integration-calendar-sync-recurrence-exceptions.el ends here