78:T112e,## What you saw Every send in an existing session made the message blink: it faded in, vanished, and faded in again. The reply did the same a moment later, when its first words arrived. ## Why The timeline keys each row by its message id. During a send, two rows change id while they are on screen: 1. **The sent message.** Until the environment confirms the send, the bubble is an echo with the id `send:`. When `turn.send` answers (or `turn.started` arrives), the echo is replaced by the recorded user message, which has a different id. React treated that as a new row: it threw away the bubble's element and mounted a fresh one. The fresh one plays the 200 ms `chat-animate-slide-up` entrance from opacity 0 again. 2. **The reply.** The assistant row is `turn::assistant` until the reply's first text message exists, then it takes that message's id. The whole row, including the thinking state, thoughts and tools, was remounted the same way, so it blinked to opacity 0 and slid in again. On a fast local environment the confirmation lands about 35 ms after Enter, so the entrance just restarts. When confirmation is slower, the bubble is fully visible first, so you see it vanish and come back. ## Fix The client already knows exactly which message confirmed which echo: the `turn.send` response and the `turn.started` event both carry the command id. So: - **`environment-client`:** when a confirmation clears an echo from the outbox, the thread records `confirmedEchoes[messageId] = commandId`. A failed echo that a later snapshot or history page shows was accepted is recorded the same way. - This is client-owned echo identity, not server state: nothing is guessed or merged. - It survives wholesale snapshot replacement. - It is left out of the IndexedDB cache, because it only matters to rows the current page drew. - **Projection (`environment-thread.ts`):** - A confirmed message gets `rowKey = send:`, the key its echo had. It is skipped while the echo is still listed, so two rows can never share a key. - Every reply row gets `rowKey = turn::assistant`. - **Timeline (`ChatView.tsx`):** row identity is `rowKey ?? externalId`. That identity is used for: - the React key; - the virtualizer item key, so the measured height carries over; - the entrance check and the remembered scroll anchor. - **`UserMessage`:** thumbnails are keyed by their stored artifact. On an image send, the echo and the confirmed message name the same bytes under different part ids, and keying by artifact stops the preview from blanking for a frame. Hosts that don't set `rowKey` (desktop/Convex) behave exactly as before. ## Verification **Real app.** I ran a side server and web build on 43123/5176 with a copy of the data and the tunnel stripped. A Playwright probe sampled every timeline row each frame, recording element identity and opacity, across three sends: | | before | after | |---|---|---| | Sent bubble, existing session | element replaced ~35 ms after Enter; entrance restarts from opacity 0 | one element throughout | | Reply row when its first text arrives | element replaced; blinks 1 → 0 → 1 | one element, no opacity dip | **Tests.** - New reducer tests: which message confirmed which echo (response first, or event first), turns this client didn't send, snapshot survival, and the failed-echo reconcile path. - New projection tests: the echo key carries over, no duplicate keys while an echo is listed, and the reply key stays stable. - New app test: the bubble's DOM node is the same element before and after confirmation, and the reply row is the same element before and after its first text. It fails on `main` and passes here. - `environment-client` / `app-core` / `web` typecheck, lint and tests pass. `boundary.test`, one `routes.test` case and one `provider-health` case fail only under full-suite load and pass alone, same as on `main`. ## Left alone On a **brand-new session's first send**, the timeline still remounts once, because `MessageTimeline` is keyed by session id and the session gets its id mid-send. The bubble's entrance gets cut short (a small snap, not a blink), and only when the session is created within the 200 ms entrance. That is the launch path from #192 and a structural change of its own, so it isn't in this PR. 🤖 Generated with [Claude Code](https://claude.com/claude-code) 79:Te4a,

**[Medium impact]** The PR appears safe to merge.

Summary

Keeps sent bubbles and reply rows mounted when their message IDs change. - Sent messages and replies stay in the same chat rows. - Image previews stay mounted when send confirmation changes part IDs. No actionable issues found. Tests and browser checks were not run during this review. Acknowledged scope: calledforth explicitly deferred the first\-send timeline remount in a brand\-new session because changing session identity is a separate structural change.

Diagram

```mermaid %%{init: {'theme': 'neutral'}}%% flowchart LR A["Echo: send command key"] --> B["Confirmation records message-to-command mapping"] B --> C["Confirmed message keeps echo row key"] D["Reply starts with turn row key"] --> E["First text changes message ID"] E --> F["Reply keeps turn row key"] C --> G["Existing row updates in place"] F --> G ``` _{Reviews (1) · Last reviewed commit: ["Keep a sent message and its reply on scr..."](https://github.com/calledforth/openmanager/commit/2daaed7db9ffb413eec3fe5d568fd5170529b3c6) · [Reviewed by Greptile](https://www.greptile.com/?utm_source=greptile_review&utm_medium=github&utm_campaign=review_public&utm_content=calledforth/openmanager)} 7a:T4a7,Keep a sent message and its reply on screen as the same rows Sending a message made it flicker. The timeline keys rows by message id, and two rows change id in place during a send: - The echo of the send is `send:` until the environment confirms it, then the recorded user message's id. React dropped the echo's element and mounted a new one, whose slide-up entrance started again from opacity 0. - The reply row is `turn::assistant` until its first text message names it. The whole row (thinking, tools) was remounted the same way and blinked out and back in. The client already knows which message confirmed which echo (the `turn.send` response and the `turn.started` event both carry the command id), so it now records that on the thread as `confirmedEchoes`. That is the client's own echo identity, not server state. The projection gives the confirmed message its echo's row key and the reply row its turn's key, and the timeline keys rows, virtualizer items, entrances and the remembered anchor by that row key. Thumbnails are keyed by their stored artifact, so an image send keeps its preview too. Co-Authored-By: Claude Opus 5.5 62:["$","$L75",null,{"entries":[{"key":["platform",{"userId":"anon"},"pulls","page",{"owner":"calledforth","repo":"openmanager","pullNumber":222}],"data":{"repositoryId":"2045","detail":{"author":{"avatarUrl":"https://cdn.trylle.com/media/images/df85a2a863690ececdfb4ceab2ebc19a?key=AYAb%2FP%2FITdOrIocJPPXAonOcVf4PkC6tWA%2FOIgQlcYyqnQQIaNnaIVD85WBzhMjz7crp9yDFQCczdUtjOlw7OfZ8AuzqFPX%2FcqsTEhdldE%2F6mDiLciX5tf9MbvCL9%2BLdJ9BZgwrkD3bRDnCxtIXBNT4aRcfWVjEqG3spdGCdDBtfTAXg8Qp%2FqZl%2FkQ%3D%3D","externalProvider":"github","login":"calledforth","type":"User","url":"https://github.com/calledforth"},"authorId":"65070429","baseRefName":"main","closedAt":null,"comments":2,"createdAt":"2026-10-18T18:34:23Z","headRefName":"fix/send-message-flicker","id":"4936224","isDraft":false,"labels":[],"number":222,"repository":{"name":"openmanager","owner":"calledforth","provider":"forgejo"},"state":"open","title":"Stop a sent message (and its reply) from flickering","updatedAt":"2026-10-18T18:39:19Z","url":"https://trylle.com/calledforth/openmanager/pulls/222","body":"$78","additions":292,"deletions":34,"changedFiles":10,"commits":1,"reviewComments":0,"headSha":"2daaed7db9ffb413eec3fe5d568fd5170529b3c6","baseSha":"af2253b48332e161dcb0241660d41410c0832da2","headRepoOwner":"calledforth","headRepoName":"openmanager","isMerged":false,"mergeCommitSha":null,"mergedBy":null,"mergeable":false,"mergeableState":"dirty","conflictingFiles":["apps/web/src/lib/environment-cache.ts","packages/app-core/src/lib/environment-thread.ts","packages/environment-client/src/state.ts","packages/environment-client/tests/state.test.ts"],"requestedTeams":[],"requestedReviewers":[],"graphqlId":"issue:222"},"comments":[{"id":26884215,"graphqlId":"26884215","body":"## 🚀 Deploying Preview to Cloudflare 🚀\n\n\n\n### Preview Deployments by commit\n\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

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Commits on Sun, Oct 18, 2026