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## Overview **Category:** fix **User impact:** Link previews no longer disappear when a message is sent while preview metadata or media is still settling. Fast Enter, rapid Enter, and confirmed-draft auto-send now preserve the preview without duplicate sends or stale tags. **Problem:** The composer could look ready before its sender-authored snapshot tag existed. Send paths could then race preview resolution/upload, while debounced preview state could attach a tag for a URL that had already been removed. The same timing also caused confirmed-draft auto-send to be consumed without sending. **Solution:** - Debounce preview resolution to avoid card flicker while typing, then disable every submit path while a supported external preview settles. A 2-second escape cap still permits a bare-link send if resolution stalls. - Keep submit synchronous: acquire a composer-local lock before asynchronous send work, read ready tags from the live URL set, and reject Enter/form submits while a snapshot is pending. - Retry confirmed-draft auto-submit until preview settling clears, then submit exactly once. - Upload thumbnail and favicon independently. A failed upload shows a toast and degrades to the surviving media (or text-only) rather than leaving the card spinning. - Exclude message-edit mode from preview resolution, upload, and Save gating. Edit-time preview snapshots remain follow-up #5273. - Canonicalize fragment-bearing URLs for preview lookup/snapshot identity while preserving the original fragment links in message text. ## Link preview state walkthrough Captured using PR #5245's actual public Open Graph metadata and artwork. The deterministic E2E bridge controls only upload timing so the transient disabled state can be captured reliably. | State | Expected behavior | Screenshot | | --- | --- | --- | | **1. Snapshot upload pending** | The real PR preview is visible, but Submit remains disabled until its sendable snapshot tag is ready. Click and Enter cannot send a bare link during the settling window. |  | | **2. Snapshot ready** | Once snapshot upload settles and the tag is ready, the same preview remains and Submit becomes active. |  | | **3. Message sent** | The sent event carries the snapshot tag and renders the PR title, description, and artwork inline instead of degrading to a bare URL. |  | ## Regression coverage - Enter during metadata resolution or snapshot upload cannot send early. - Paste-and-immediate-Enter sends after settling; rapid Enter submits exactly once. - Confirmed-draft auto-send waits for settling and fires exactly once. - Removed/replaced URLs cannot leak stale snapshot tags or media refs. - Thumbnail upload failure toasts and sends with the surviving favicon. - Edit mode does not resolve/upload previews or gate Save. - Fragment variants share a canonical preview while original fragment links remain clickable. - Existing ready-preview, suppression, bare-link fallback, and multi-preview behavior remains covered. ## Reproduction steps 1. Open a channel and paste a supported external URL into the composer. 2. Press Enter immediately, before preview metadata/media finishes settling. 3. Before this fix, the event could be sent without its preview snapshot (or confirmed-draft auto-send could be lost). With this fix, submit waits behind the disabled state and fires once with the matching snapshot tag. 4. Remove or replace the URL and press Enter inside the debounce window. The sent event contains tags only for URLs still present in the submitted content. ## Validation All required PR checks are green, including Desktop Core, Desktop Smoke E2E shards, Desktop E2E Integration shards, macOS build, security checks, and DCO. --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com> Signed-off-by: Wes <wesbillman@users.noreply.github.com> Co-authored-by: Wes <wesbillman@users.noreply.github.com> Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>
