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Reset a browser pane's selected frame and element refs when the page navigates - #18577
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The selected frame and the element refs lived in three dictionaries on TerminalController. They now sit in one value, BrowserAutomationDocumentState, that the controller still owns, and browser.state.load hands its frame selector to BrowserStateLoadTransaction instead of setting it inline. No behavior change: the transaction restores the frame selection first, where the inline code ran.
mainFrameDidCommit is added as an empty hook so the tests compile; nothing reacts to a main-frame commit yet, which is the reported behavior.
A frame selected with browser frame select, and the element refs handed out for a page, outlived the page. After a navigation the stored frame selector matched nothing and commands silently ran in the new top document, and an old ref replayed its selector there. The panel now posts browserMainFrameDidCommit from its didCommit callback and the controller drops that surface's frame selection and refs before any later command can read them. browser.state.load restores the saved frame selector last, and only when it names a same-origin frame in the loaded page.
…ked in a replaced document Review found two gaps. browser.state.load probed for the saved frame right after the navigation committed, before the page had parsed its iframes, so the selector was dropped; the probe now waits for DOMContentLoaded. And a redirect committing while frame select checked its selector could leave that selector stored for the new page; the state now refuses a selection checked in an earlier document, and frame select reports stale_state.
…e frame select The parse wait in browser.state.load could run to the script timeout behind a stalled parser and push the command past the CLI's response timeout; it now gives up in the page after two seconds. frame select restores a discarded page before noting which document it checks the frame in, so that restore's commit is not mistaken for a page change.
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughBrowser automation now tracks frame selection, element references, and document generations per surface. Main-frame commits clear that surface’s frame context and references. State loading restores a saved frame selection only after the transaction succeeds. ChangesBrowser document state
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant BrowserPanel
participant NotificationCenter
participant TerminalController
participant BrowserAutomationDocumentState
BrowserPanel->>NotificationCenter: Post main-frame commit with surfaceID
NotificationCenter->>TerminalController: Deliver commit notification
TerminalController->>BrowserAutomationDocumentState: Clear surface state and advance document generation
Suggested reviewers: Merge Risk: ⚪ Minimal · up to No confirmed issue remains that would prevent merging after normal checks. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (4 errors, 1 inconclusive)
✅ Passed checks (20 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 5 files. (1 skipped: 1 too large.) Full details: Cmux Swift Blocking RuntimeExplanation The production diff adds timing and blocking synchronization. Resolution Remove the direct Full details: Cmux Algorithmic ComplexityExplanation
Resolution Store element refs per surface, such as Full details: Cmux Full InternationalizationExplanation The production diff adds the API error text Resolution Add a stable localization key for the new stale-frame error, return it through Full details: Cmux Architecture RethinkExplanation The diff adds a lifecycle timing repair in Resolution Move frame-restoration readiness into the existing
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @Sources/TerminalController.swift:
- Around line 9923-9948: In the browser.frame.select flow, recheck the document
generation after v2BrowserProbeFrame completes and before switching on its
result; return stale_state if it changed so every probe outcome is rejected when
the page commits during the probe.
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Packages/macOS/CmuxBrowser/Sources/CmuxBrowser/Control/BrowserAutomationDocumentState.swiftPackages/macOS/CmuxBrowser/Sources/CmuxBrowser/Control/BrowserStateLoadTransaction.swiftPackages/macOS/CmuxBrowser/Tests/CmuxBrowserTests/Control/BrowserAutomationDocumentStateTests.swiftPackages/macOS/CmuxBrowser/Tests/CmuxBrowserTests/Control/BrowserStateLoadTransactionTests.swiftSources/Panels/BrowserPanel.swiftSources/TerminalController.swift
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Merge receipt for |
29661b9 gh-merge-green: allow explicit Vercel status override (manaflow-ai#18614) dd6e295 fix: preserve SSH ProxyCommand child environment (manaflow-ai#18285) f0a2bad Reject invalid Python regression-lane timeouts (manaflow-ai#18476) 3430354 Preserve PR media referenced through GitHub blob URLs (manaflow-ai#18562) 3b71b41 Reset a browser pane's selected frame and element refs when the page navigates (manaflow-ai#18577) 04e1d68 Clear force-close bypass when a confirmed close is rejected (manaflow-ai#18414) 8d86447 Treat Copilot value flags as value options when restoring (manaflow-ai#18470) f6c678a Keep __proto__ keys in whole-area browser storage reads (manaflow-ai#18527) 7e97128 Keep minimized windows in the Dock when the global hotkey reveals cmux (manaflow-ai#18533)
2 participants
Summary
browser frame selectstores a frame selector for the surface, and nothing cleared it when the page changed. After a navigation to a page without that frame, the eval wrapper couldn't find the selector and quietly used the new page's top document, soeval,clickand the rest reported success against the wrong document. Element refs (@e1, ...) had the same lifetime problem: a ref from the old page stayed resolvable and replayed its selector against the new one.Now a main-frame commit ends both for that surface:
browser frame mainnot_found: Element reference not found, and their ordinals are never reusedThe commit signal is the panel's existing
WKNavigationDelegatedidCommitcallback, so this coversbrowser navigate, reload, back and forward, and also a link the page follows or a redirect the user triggers. A fragment change orhistory.pushStatedoesn't commit, so a frame selected in a single-page app stays selected. Other surfaces aren't touched.One consequence to know about: cmux also reloads a page on its own, when it restores a discarded hidden WebView, recovers from a web content crash or switches profile. Those commit too, so they reset the frame. Before this change the selector happened to match again on the reloaded page. I kept one rule for every new document instead of special-casing these, since page state is lost in all three anyway.
browser state loadused to write the savedframe_selectorinto the map before it navigated. It now restores it last, after the page has loaded and storage is applied, and only if the selector still names a same-origin frame in that page (the same probeframe selectruns). Otherwise the surface stays in the main frame. A navigation is reported at commit, before the page has parsed its iframes, so this probe waits forDOMContentLoadedfirst, for at most two seconds. A failed load no longer changes the frame selection at all.frame selectchecks its selector with a round trip to the page. If the page commits a new document during that check, the command fails withstale_state, whatever the check found, instead of answering for a page that is gone.Mechanically: the selected frame and the refs were three dictionaries on
TerminalController. They move into one value,BrowserAutomationDocumentStateinCmuxBrowser, which the controller still owns, so the rule "a commit drops this surface's entries" can be tested without the app.BrowserPanelpostsbrowserMainFrameDidCommitfromdidCommit, and the controller's observer drops the state synchronously on the main thread, before any later socket command can read it.BrowserStateLoadTransactiongains arestoreFrameSelectionstep.No socket method, parameter or response field changes, and the relay policy is untouched.
Fixes #16131
Testing
83f03834be4moves the state intoCmuxBrowserwith no behavior change.21de9eb2902adds the failing regressions, plusmainFrameDidCommitas an empty hook so they compile.8cc28ee3508is the fix.ce88fbe44baandc753ff6cd73apply two subagent reviews: the parse wait instate load, bounded to two seconds in the page, and thestale_statecheck inframe select.d7141602547applies CodeRabbit's point that every probe outcome should reportstale_stateafter a commit; the app was rebuilt with it.swift test --package-path Packages/macOS/CmuxBrowser --filter 'BrowserAutomationDocumentStateTests|BrowserStateLoadTransactionTests'at21de9eb2902: 5 of 10 tests fail with 8 issues. The selected frame and the ref both survivemainFrameDidCommit, the frame selection is restored before cookies and navigation, and it is restored even when cookies, navigation or storage fail. At8cc28ee3508all 10 pass, and 11 atc753ff6cd73with the replaced-document case.CmuxBrowserpackage suite passes (731 tests).CMUX_DEV_BACKEND_MODE=local ./scripts/reload.sh --tag baseline --build-onlycompiled the app with the change.python3 scripts/verify-local.pyandgit diff --checkpass.didCommitto the controller and the frame probe script are compiled only, and I didn't launch a tagged build to run the issue's five steps.tests_v2/test_browser_api_extended_families.pyexercisesframe.selectover the socket but needs a running app.Changelog
Fixed: After a browser pane navigates, automation commands no longer keep running against a frame selected on the previous page, and element refs from that page are rejected instead of acting on the new one
Proof
No UI change. The red and green runs above are the evidence; runtime behavior is unverified as noted.
Checklist
cmux ssh: the relay authorization questions are answered above (no method added or allowlisted)Need help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Resets a browser surface's selected frame and element refs when its main frame commits a new document, so automation commands no longer silently run against the wrong page after a navigation.
Previously, a frame selected on one page outlived that page: after a navigation the stored selector matched nothing and
evalandclickquietly ran against the new page's top document, and element refs from the old page replayed their selectors on the new one. Now any main-frame commit (browser navigate, reload, back/forward, a followed link, a redirect) returns the surface to the main frame and makes its refs fail withnot_found: Element reference not found; ref ordinals are never reused. A fragment change orhistory.pushStatedoesn't commit, so a frame selected in a single-page app stays selected. Note that cmux's own reloads — restoring a discarded WebView, recovering from a crash, switching profiles — also reset the frame, since page state is lost in all those cases anyway.Behavior details
browser.state.loadrestores the saved frame selector last, only when the load succeeded and the selector still names a same-origin frame in the loaded page, waiting up to two seconds for the page to parse.browser.frame.selectrefuses a selection withstale_statewhenever the page commits a new document during its own-frame probe, regardless of what the probe found.BrowserAutomationDocumentStateinCmuxBrowser; the panel postsbrowserMainFrameDidCommitfromdidCommit, and the controller drops the surface's state synchronously before any later command can read it.Fixes #16131.
Written for commit d714160. Summary will update on new commits.
Note
Medium Risk
Changes browser automation command semantics and state-restore ordering; incorrect timing could still cause stale selectors, but behavior is tightened and covered by new unit tests.
Overview
Main-frame navigation now clears per-surface automation context so
browser frame selectand@e*refs cannot keep acting on a new document after the old page is gone.Frame selectors and element refs move from ad-hoc dictionaries on
TerminalControllerintoBrowserAutomationDocumentState(CmuxBrowser). On each main-frame commit,BrowserPanelpostsbrowserMainFrameDidCommit; the controller drops that surface’s selected frame and refs synchronously on the main thread (same-document navigations like fragments/pushStatedo not commit, so SPA frame selection is unchanged).browser.frame.selectrecords a document generation before probing the frame; if the page commits during the probe, selection fails withstale_stateinstead of storing a selector for the wrong document.browser.state.loadapplies savedframe_selectoronly after cookies, navigation commit, and storage—probing for a same-origin frame (with a bounded parse wait)—and skips frame restore on any failed step.Reviewed by Cursor Bugbot for commit d714160. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by CodeRabbit