Synapse 1.153 MSC4140 implementation does NOT use an unstable-prefix rooms
send path. The correct API is:
PUT /_matrix/client/v3/rooms/{id}/send/{type}/{txnId}
?org.matrix.msc4140.delay={ms}
which returns { delay_id } instead of { event_id }.
Cancel/restart remain at:
POST /_matrix/client/unstable/org.matrix.msc4140/delayed_events/{id}
body: { action: 'cancel' | 'restart' }
Also: context menu — copy link removed, mute durations converted to
PopOut submenu using RectCords pattern (e.currentTarget.getBoundingClientRect)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
API fix: delay was embedded in the path string causing 404 — moved to
proper query param object; prefix changed from '' to the full MSC4140
unstable prefix so authedRequest builds the correct URL. Cancel and
restart endpoints fixed the same way.
Date/time picker: replaced single datetime-local (hard to use time
portion) with separate date + time inputs side by side; colorScheme:'dark'
hints the browser to render calendar/clock popups in dark mode to match
the app. Preview row now shows as a styled Primary.Container chip with
clock icon. Relative time ("in 2h 15m") shown below the label.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
P3-1: Message Bookmarks — right-click any message to bookmark; saved to
io.lotus.bookmarks account data (max 500, syncs across devices); star
icon in sidebar opens BookmarksPanel with filter, Jump-to-message, and
remove buttons; reactive to AccountData events
P3-2: Message Scheduling (MSC4140) — clock button next to send opens
ScheduleMessageModal with datetime-local picker; validates ≥1 min future;
calls PUT org.matrix.msc4140 delayed event API; collapsible
ScheduledMessagesTray above composer lists pending messages with cancel;
local Jotai atom tracks scheduled messages per room
P3-3: File Upload Compression — opt-in checkbox per JPEG/PNG file ≥200KB
in upload preview; canvas API compresses at 0.82 quality; shows before/
after size estimate; compressed blob used in upload when checked
P3-7: Room Insights — new Insights tab in room settings; top 5 active
members (bar chart), top 5 reactions (chips), media breakdown (4 tiles),
24-hour activity heatmap (CSS bar chart); all from local cache only with
disclaimer banner; never the first tab shown
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
jared