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fix(web): edit from here works after a previous rewind - #18982
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"Edit from here" assumed the run before run N was always run N - 1. Run ordinals keep counting after a rewind, so after one rewind the action looked up the rolled-back run's checkpoint and failed with "Rollback target run ordinal N is unavailable". A run stopped before its own checkpoint was captured also hid the action entirely. Target the checkpoint of the previous visible run instead, or the thread start for the first run once all history is loaded, and no longer require the edited run to have its own checkpoint. Send that checkpoint's id with the rollback: the history window the command used to re-fetch omits the thread-start checkpoint once the run that created it was rolled back. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — This is a localized web bug fix for an existing rollback workflow: it selects the correct prior checkpoint after rewinds and exposes the action for interrupted runs, while retaining the existing fallback behavior. The change adds focused tests and does not alter schemas, deployment, product defaults, or static-analysis configuration. You can add or adjust custom eligibility rules. Learn more. |
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📝 Walkthrough
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title is concise, specific, and accurately describes the primary fix for editing after a previous rewind. |
| Linked Issues check | |
For #16727, the client now maps each visible local run to the ready checkpoint of the preceding visible run. It uses the thread-start checkpoint only for the first visible run when that checkpoint is … |
| Out of Scope Changes check | |
The changes remain within #16727. Session logic, timeline projection, ChatView, rollback waiting, and checkpoint retention implement or test the target-selection and action-visibility behavior. The … |
| Description check | |
The description clearly explains the problem, implementation, scope, verification results, limitations, screenshots, recordings, and agent usage. It does not use explicit Problem and Change headings, … |
Full details: Linked Issues check
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Explanation
For
#16727, the client now maps each visible local run to the ready checkpoint of the preceding visible run. It uses the thread-start checkpoint only for the first visible run when that checkpoint is ready. It excludes inherited history, unsettled runs, missing checkpoints, and unavailable provider targets.ChatViewsends checkpoint and scope identifiers from the live projection, and the rollback waiter handles runs that are paged out. Projection changes retain the initial ready checkpoint across cold loads. The updated tests cover rewind gaps, action visibility, provider eligibility, streaming updates, and paged history.
Full details: Out of Scope Changes check
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Explanation
The changes remain within
#16727. Session logic, timeline projection,ChatView, rollback waiting, and checkpoint retention implement or test the target-selection and action-visibility behavior. The server projection change supports retention of the required initial checkpoint during paged history. No unrelated product behavior or contract change is shown.
Full details: Description check
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Explanation
The description clearly explains the problem, implementation, scope, verification results, limitations, screenshots, recordings, and agent usage. It does not use explicit Problem and Change headings, and the scope section does not include a direct approval comment or link to the maintainer approval, but the required information is otherwise substantially complete.
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Taking over this one for batch web-misc-05. I’ll keep this as a single focused fix, reduce the tests to useful coverage, merge current main without rewriting your commits, and verify rollback targeting before publishing. |
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Inline comments:
Review comments at @apps/web/src/components/ChatView.logic.ts:
- Around line 1086-1096: In the rollback flow that computes `witness`, reject
immediately if it is undefined before calling `revert` or creating the promise;
this prevents waiting for the timeout when there is no settled run with an
ordinal above `turnCount`.
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📒 Files selected for processing: 10
apps/server/src/orchestration-v2/ProjectionStore.test.tsapps/server/src/orchestration-v2/ProjectionStore.tsapps/web/src/components/ChatView.logic.test.tsapps/web/src/components/ChatView.logic.tsapps/web/src/components/ChatView.tsxapps/web/src/components/chat/MessagesTimeline.logic.test.tsapps/web/src/components/chat/MessagesTimeline.logic.tsapps/web/src/components/chat/MessagesTimeline.tsxapps/web/src/session-logic.test.tsapps/web/src/session-logic.ts
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After an earlier rewind, run ordinals contain gaps. “Edit from here” used ordinal minus one, which could target removed history; stopped resends and older paged prompts could also lose the action.
The action now uses the preceding visible local run's ready checkpoint, or the retained initial checkpoint after all history is loaded. It checks provider eligibility, reads paged prompts from the displayed timeline, and waits for the requested provider target and retained rollback suffix. Stale edits reject before dispatch. Idle providers and Claude's replacement session at thread start are supported. The windowed projection keeps the initial ready checkpoint, and streaming rows reuse equal availability sets.
Scope and approval: maintainer-requested takeover of this focused existing rewind bug. Rebuilt from @voltcrash's #18982, retaining the contributor's commits and merging main normally. No new product surface or provider capability.
Verification:
Before — actual main at 5307c233b1: the prompt targets unavailable ordinal 16.
Before interaction recording
After — 3ffafd6a78: conversation rewinds and the exact prompt returns.
Completed-turn recording · Stopped-turn recording · Identical stopped-resend recording
Cold load and paged history on the final head:
Paged-history recording
Published-head build, lint and all test jobs pass; review threads are resolved. An earlier native-fingerprint run was cancelled by workflow concurrency and replaced by a successful run on the same head. The cancelled result is retained in the check history.
Implementation: Codex gpt-6.1-sol; tests: Codex gpt-6-astra; reviews: Claude claude-opus-5-5 and Codex gpt-6-sol, through T3 Code.