handleReceipt recomputed unread from getUnreadNotificationCount, which is
server-computed and stale on the synchronous synthetic receipt echo (the SDK
only zeroes it immediately when the last event is our own message). Reading
someone else's message therefore PUT the stale non-zero count back -> dot stuck
or resurrected on the ack-sync ordering race. Restore upstream cinny's
optimistic DELETE on our own receipt; the UnreadNotifications listener re-asserts
the accurate badge on the server ack.
Also collapse a {total:0,highlight:0} PUT to a DELETE in the reducer (a present
map entry lights the dot via hasUnread=!!unread, so phantom {0,0} PUTs from the
UnreadNotifications listener left stuck dots).
Mark-as-Unread (MSC2867): clear the flag directly in markAsRead (opening an
already-read room sends no receipt, so the receipt-driven auto-clear never
fired), and gate the receipt auto-clear to main/unthreaded receipts so reading
one thread no longer wipes the whole-room flag.
Tests: 700/700 pass; typecheck + prod build clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The prior thread-receipt change (8192da5a) broke read receipts globally. Exact
cause: markAsRead used `thread.lastReply() ?? thread.rootEvent`. When a thread's
replies weren't loaded (lastReply() null — common on room open), it sent a
receipt for the thread ROOT. Since roots are "in the main timeline",
threadIdForReceipt() makes that a MAIN receipt at an old event; when the root
isn't in the loaded timeline the SDK's backward-guard falls back to timestamp
and applies it, moving the main read receipt onto an event we don't have, so
getEventReadUpTo() returns null and roomHaveUnread() reports the room unread —
re-broken on every mark-read, amplified by the bulk mark-all-orphan-rooms-read
callers.
Fix: main unthreaded receipt unchanged; the thread loop now sends a threaded
receipt ONLY for a genuine loaded thread reply (thread.lastReply()), never the
root — if replies aren't loaded, skip. New notifications.test.ts locks the
regression (null lastReply → no root receipt) + the main/threaded/no-op cases.
Gates: tsc/eslint/prettier clean, build OK, 672 tests (7 new).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jared