[juliusmarminge]

Preview click, hover and drag scrolled their target into view with a single Locator.scrollIntoViewIfNeeded call. Playwright resolves the node once there, so a page that re-renders the target mid-scroll made the action fail with 'Element is not attached to the DOM', even though the input action that follows re-resolves the locator. targetPoint now goes through a small scrollIntoView helper that retries only that exact detached-node error, passing the remaining time each attempt so the whole scroll stays within the action's existing timeout; other errors and the final timeout are rethrown unchanged. The author's approach and commits are kept; merged origin/main with no conflicts, and nothing in the diff needed cleanup. Two tests in ServerBrowserPage.test.ts: a click that succeeds after a replaced target, and a fake-timer test that the retry stops at the timeout (timeouts [100, 40], then rethrow). Both fail with main's source and pass with the fix. The push to fix/issue-30585 was rejected by the remote, so the branch was pushed to the fallback name.

Fixes #30585

Supersedes #30600. The change is @juliusmarminge's; their commits are kept.

Reproduction on main

Serve a page containing Save and a script that replaces it with cloneNode(true) every 40 ms. In a T3 Code thread, ask the agent to open that page with preview_open, take a preview_snapshot, and use the selector-based preview click on #save with timeoutMs 3000; repeat to encounter the timing-dependent failure. Main can return 'Element is not attached to the DOM' before clicking; this change retries the scroll and can complete when a replacement remains attached long enough. Repeat with hover, or drag #save to a stable target, to exercise the shared positioning path. Continuous replacement can still exhaust the timeout on the fixed branch; these steps were read from the issue and PR, not executed.

Evidence

Manual real-server proof using identical synthetic pages and MCP calls on both commits. Environment: server-owned Chromium, 1280×800 CSS pixels, device scale factor 2, light page, separate fresh databases with seeding disabled.

Open the page and snapshot it, then perform four clicks, hovers and drags each with timeoutMs 3000. Save is below the viewport and cloned every 40 ms for 1.4 seconds before remaining attached; the drag destination stays stable. The page counts dispatched input events and displays actual MCP responses. A separate continuous-cloning run checks bounded failure without input.

	Before · 31eea883c7	After · a5739e07e2
Recovery	11/12 gestures abort with detached-target errors; failed gestures dispatch zero counted inputs	12/12 complete with exactly one counted input each
Results
Interaction	Before recording	After recording
Continuous replacement every 1 ms	Immediate detachment failures, zero counted inputs	Click/hover/drag time out in 3008/3008/3006 ms, zero counted inputs
Bounded-failure results
Continuous-replacement interaction	Before recording	After recording

Driver and fixture · Reproduction instructions

Runtime results: before recovery, after recovery, before continuous replacement, after continuous replacement.

AI-assisted; verified with the tests and tools listed above.

Tests

vp test run src/preview/ServerBrowserPage.test.ts (apps/server): 33 passed. Same file with main's ServerBrowserPage.ts, -t 'server browser click': 2 failed (confirms both tests catch the regression). vp run check:changed: format, lint, knip, graphql, typecheck (3 packages), tests (2 files, 35) all pass.

Not in this change

• fix(server): preview click, hover and drag fail within their timeout, not up to 3x later #33550 changes preview timeout budgeting; it overlaps targetPoint's timeout handling but does not retry detached nodes, so it was not folded in here.

AI-assisted; verified with the tests and tools listed above.

[macroscopeapp]

Approvability

Verdict: Approved at a5739e0

Macroscope's review found this PR approvable — Preview click, hover and drag can recover when a target is replaced while scrolling into view. Retries are time-bounded and limited to the specific detached-element error, leaving other failures and input behavior unchanged.

Notes:

• All code in this push has already been reviewed. Approvability was decided on eligibility alone.

No code changes detected at 0b0c939. Prior analysis still applies.

^{You can add or adjust custom eligibility rules. Learn more.}

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	21.5 KiB	21.5 KiB	0 B (0.0%)	24.4 KiB	✅
Codex	Live turn messages	1	1	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.9 KiB	21.9 KiB	0 B (0.0%)	24.4 KiB	✅
Claude	Live turn messages	1	1	0 (0.0%)	8	✅

Baseline: bc9c84e · PR result: a5739e0 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[coderabbitai]

Important

Review skipped

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Walkthrough

Target positioning now retries scroll failures caused by the exact detached-element error while time remains. The retry uses the remaining timeout. Tests cover a successful retry and failure when the timeout expires.

Changes: Preview target retry

Layer / File(s)	Summary
Retry scrolls within the action timeout apps/server/src/preview/ServerBrowserPage.ts, apps/server/src/preview/ServerBrowserPage.test.ts	A new helper retries scrollIntoViewIfNeeded after the exact detached-element error, using the remaining timeout with a minimum of 1 ms. targetPoint calls the helper. Tests check a successful retry and confirm that retries stop when the timeout is exhausted.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Low

Possibly related PRs

• pingdotgg/t3code#30600: Implements detached-target retries for preview actions; this PR continues that code change.
• pingdotgg/t3code#33550: Changes the timeout contract for targetPoint and preview actions, which is related to the retry timeout budget.

Suggested labels: bugfix, size:S

Suggested reviewers: maria-rcks

Merge Risk: Minimal · previous review a5739

Preview click, hover, and drag actions now retry positioning when the target is replaced mid-scroll, within the action's existing timeout. No merge-blocking risk remains. Behavior against a real replacing DOM is not yet shown, but this is normal pre-release validation.

Pre-merge checks: 3 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Linked Issues check		#30585 requires targetPoint to recover replacement targets for click, hover, and drag, with bounded retries and unchanged ordinary errors. The shared scrollIntoView helper applies the retry to `ta…	Add focused automated tests for replacement during hover and drag. Add tests for unchanged ordinary errors and for a persistently detached target. Assert successful actions dispatch input exactly once, and failed actions dispatch no input.

Passed checks: 3 passed

Check name	Status	Explanation
Title check		The title clearly and specifically describes the main change: preview click, hover, and drag now survive target replacement during scrolling. It follows the conventional commit format.
Out of Scope Changes check		The source change is limited to retrying the detached-node failure during target positioning. The added tests cover the timeout and successful replacement behavior. These changes support #30585 and do…
Description check		The description provides the problem, implementation, linked issue, reproduction details, extensive verification evidence, test results, and out-of-scope context. It does not use the required section …

Full details: Out of Scope Changes check

Explanation

The source change is limited to retrying the detached-node failure during target positioning. The added tests cover the timeout and successful replacement behavior. These changes support #30585 and do not show unrelated scope.

Full details: Description check

Explanation

The description provides the problem, implementation, linked issue, reproduction details, extensive verification evidence, test results, and out-of-scope context. It does not use the required section headings and does not clearly document explicit maintainer approval or why approval was unnecessary, but the required information is mostly present.

Full details: Linked Issues check

Explanation

#30585 requires targetPoint to recover replacement targets for click, hover, and drag, with bounded retries and unchanged ordinary errors. The shared scrollIntoView helper applies the retry to targetPoint and preserves one deadline. The pull request adds only click coverage. It does not add tests for hover and drag replacement, ordinary errors, or persistent detachment as requested by #30585.

Resolution

Add focused automated tests for replacement during hover and drag. Add tests for unchanged ordinary errors and for a persistently detached target. Assert successful actions dispatch input exactly once, and failed actions dispatch no input.

Finishing Touches

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only still-valid issues, skip the rest with a brief reason, keep changes
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Failed pre-merge checks:
- Description check:
Add the required template headings. Complete the Evidence section with the
required before-and-after screenshots and any needed interaction recording.
Document the triaged issue or explicit maintainer approval, including the
approval comment, or explain why this focused bug fix qualifies for the approval
exemption.

- Linked Issues check:
Add focused automated tests for replacement during hover and drag. Add tests for
unchanged ordinary errors and for a persistently detached target. Assert
successful actions dispatch input exactly once, and failed actions dispatch no
input.

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Review info

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• Branch: factory/pr-30600-a1794391731
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• apps/server/src/preview/ServerBrowserPage.ts

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[juliusmarminge]

The automated pipeline stopped on this pull request and will not merge it:

someone else pushed to factory/pr-30600-a1794391731 (head is now 0b0c939); the pipeline does not build on commits it did not review

It stays open for a person to finish or close.