[playlikeboy]

Problem

Fixes https://git.cafe/pingdotgg/t3code/issues/23734

On Windows with NTFS, reading keybindings.json (such as by Defender, backup agents, or search indexing) updates the file's last-access timestamp (atime). This fires an fs.watch change event. Previously, revalidateAndEmit invalidated the cache and published to changesPubSub unconditionally, causing the client to receive keybindingsUpdated events and display spurious 'Keybindings updated' toasts even though the file content was completely unchanged.

Change

In apps/server/src/keybindings.ts:

• Added structural state comparison helpers (isSameKeybindingsConfigState, isSameResolvedRule, isSameResolvedShortcut, isSameWhenAst, isSameConfigIssue) to compare two KeybindingsConfigState values without unnecessary serialization.
• Retained lastEmittedStateRef in the service instance, initialized during startup and kept synchronized on each change emission.
• In revalidateAndEmit, checked whether the reloaded state equals lastEmittedStateRef. If keybindings and issues are structurally identical, change emission to changesPubSub is suppressed.
• Added revalidate to the Keybindings service interface for deterministic revalidation testing.

Scope and approval

Fixes bug https://git.cafe/pingdotgg/t3code/issues/23734. The change is strictly scoped to the server keybindings watcher and cache revalidation logic in apps/server/src/keybindings.ts.

Verification

• Added an automated regression test in apps/server/src/keybindings.test.ts verifying that revalidating an unchanged config produces 0 change events, while modifying the file content correctly emits the updated keybindings.
• Ran the test suite via vp test run src/keybindings.test.ts (19 of 19 tests passed in ~1s).
• Ran vp lint and vp fmt with 0 errors and 0 warnings.
• Ran TypeScript compilation with zero type errors.

Model: Claude Fable 5.1. Harness: Claude Code.

Fixes #23734

[macroscopeapp]

Approvability

Verdict: Approved at 97ed582

Macroscope's review found this PR approvable — This is a narrowly scoped server bug fix that suppresses redundant keybindings update notifications while preserving emissions for real configuration changes. A focused regression test covers both unchanged revalidation and changed configuration behavior.

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

[coderabbitai]

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Walkthrough

Keybindings revalidation now compares loaded configuration with the last emitted state. It skips change events when that state is unchanged. The service exposes revalidate, and a test covers unchanged and changed configurations.

Changes: Keybindings revalidation

Layer / File(s)	Summary
Track and compare keybindings state apps/server/src/keybindings.ts	Configuration states are compared using resolved keybindings and configuration issues. The service records the initial state and each emitted state. Revalidation skips emission when the loaded state matches.
Expose and test revalidation apps/server/src/keybindings.ts, apps/server/src/keybindings.test.ts	The Keybindings service exposes revalidate. The test checks that unchanged configuration emits no event and that changed configuration emits an event containing threadPanel.toggle.

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

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

Merge Risk: Minimal · up to 28bab

This change stops redundant keybindings-updated events and toasts when the configuration is unchanged. No concrete merge-blocking risk was identified, and the regression test covers both the unchanged and changed cases.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title names the server keybindings change and the fix: it suppresses a redundant change emission when revalidation finds unchanged content. The changeset matches this: it adds structural state com…
Description check		The description follows the template. It has Problem, Change, Scope, and Verification sections, and the Problem section gives the Windows NTFS atime cause and the spurious toast symptom. The Change se…
Linked Issues check		Directly linked issue #23734 requires that the keybindingsUpdated push occurs only when the keybindings configuration changes. The whole-PR diff (merge base 1a12c4a to head 28bab76) implements this in…
Out of Scope Changes check		The whole-PR diff changes only apps/server/src/keybindings.ts and apps/server/src/keybindings.test.ts. Each hunk supports #23734. The equivalence check, lastEmittedStateRef, the ref update in emitChan…

Full details: Title check

Explanation

The title names the server keybindings change and the fix: it suppresses a redundant change emission when revalidation finds unchanged content. The changeset matches this: it adds structural state comparison in keybindings.ts and suppresses changesPubSub emission when the reloaded state equals the last emitted state. The title follows the conventional commit format and is specific. It is 85 characters, which is longer than ideal but acceptable.

Full details: Description check

Explanation

The description follows the template. It has Problem, Change, Scope, and Verification sections, and the Problem section gives the Windows NTFS atime cause and the spurious toast symptom. The Change section names the helpers and the emission logic. The Scope section links issue 23734 and explains why the change is limited. The Verification section lists the test file, the test command with 19 of 19 passing, lint, format, and typecheck results, and it names the model and harness. It does not state what could not be checked. The reported pipeline comments say the Windows/NTFS reproduction was not verified, and the description does not mention that gap.

Resolution

Optionally add a line in Verification that the Windows/NTFS unchanged-read reproduction was not run, so reviewers know the atime path is covered by reasoning and not by a live Windows check.

Full details: Linked Issues check

Explanation

Directly linked issue #23734 requires that the keybindingsUpdated push occurs only when the keybindings configuration changes. The whole-PR diff (merge base 1a12c4a to head 28bab76) implements this in apps/server/src/keybindings.ts. (1) lastEmittedStateRef is added. Startup stores the loaded initial state in it. emitChange stores the state before it publishes. (2) revalidateAndEmit runs under upsertSemaphore. It reads the previous emitted state, reloads the config through reloadConfigState, and calls emitChange only when there is no previous state or isSameKeybindingsConfigState reports a difference. (3) isSameKeybindingsConfigState is built with Schema.toEquivalence over a Struct of ResolvedKeybindingsConfig and Schema.Array(ServerConfigIssue). Changed content still reaches emitChange. (4) The regression test in apps/server/src/keybindings.test.ts revalidates unchanged content, writes a new mod+k threadPanel.toggle rule, revalidates, and reads the first buffered event with Stream.runHead. It asserts that the event contains the new rule, so a wrongly emitted unchanged event fails the test. Limits of this review: the runtime behavior of Schema.toEquivalence on these schemas was not executed here, and the PR description still names helper functions (isSameResolvedRule, etc.) that no longer appear in the diff. The PR reports a passing test run. The issue has no non-coding requirements.

Full details: Out of Scope Changes check

Explanation

The whole-PR diff changes only apps/server/src/keybindings.ts and apps/server/src/keybindings.test.ts. Each hunk supports #23734. The equivalence check, lastEmittedStateRef, the ref update in emitChange, the reloadConfigState extraction, the suppression check in revalidateAndEmit, and the startup ref initialization implement the requested suppression. The change from type ServerConfigIssue to a value import is needed because the schema is used at runtime. The revalidate member exposes revalidateAndEmit for the regression test. The test file adds Option and Stream imports and one test case. reloadAndEmit still emits unconditionally. It is outside the watcher revalidation path and this PR does not change it. The diff contains no client, contract, or configuration changes. The PR description is stale, but this does not change scope.

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @apps/server/src/keybindings.test.ts:
- Around line 547-550: Update the keybindings revalidation tests so assertions
observe the subscribed stream deterministically: await consumption of the
changed-config event before checking emitted contents, and use a synchronized
observation to verify unchanged config publishes no event. Do not rely on
scoped-fork completion to wait for the stream consumer.

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[playlikeboy]

Addressed the review note on the regression test in 9383494.

The test no longer consumes the subscription in a scoped fork and asserts on an array right after revalidate returns. It now reads the subscription with an awaited Stream.runHead. Because revalidate publishes before it returns, an event wrongly emitted for the unchanged config would be buffered ahead of the real change; the test asserts that the first buffered event carries the new mod+k rule, which covers both the no-event and the changed-config case without a timing window. No wall-clock timeout is used, since it would not fire under the test clock.

Checks run locally on this branch:

• vp test run apps/server/src/keybindings.test.ts: 19 passed.
• Same test with the suppression check in revalidateAndEmit temporarily removed: fails with expected false to be true, then restored.
• vp lint apps/server/src/keybindings.test.ts and vp fmt --check: clean.
• vp run --filter t3 typecheck: no errors.

[juliusmarminge]

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

the fix is written and reviewed, but proving it needs something no worker has:

• Permanent blocker: Windows with NTFS last-access updates enabled is required to reproduce the unchanged-file read triggering a watcher event. This Linux VM cannot execute that reproduction, and substituting another trigger is prohibited by the brief.
• Real shortcut edits propagating the updated binding and notification were not verified.

It stays open for a person to finish or close.

[juliusmarminge]

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

the proof has no capture anyone can open:

• The unchanged-file read producing a keybindingsUpdated push and spurious toast on base remains unverified because Windows allocation did not succeed.
• Suppression of the unchanged-read push and toast on head remains unverified for the same reason.
• Real-edit binding propagation, normal notifications, and validation-issue propagation remain unverified because neither app revision was run.
• No capture was produced and no ghdrop upload was attempted; there is no public capture URL or upload-error output.

It stays open for a person to finish or close.

[juliusmarminge]

Evidence

Environment for all captures: real Windows Server 2025 server, NTFS last-access updates enabled, Chromium web client, 1280×800, dark theme, isolated synthetic project.

Steps: let startup settle; prepare a two-hour-old access timestamp with unchanged contents and modification time; enable last-access updates; read keybindings.json using type. The access timestamp advanced on both commits. Base emitted one keybindingsUpdated push and displayed a success toast; head emitted neither. Then edit a valid shortcut, exercise it, introduce a modifier-only invalid shortcut, and correct it. Each actual edit or validation change emitted one push on both commits.

Before	After
1a12c4afae	28bab76817
Before recording	After recording

Reproduction driver · Runtime observations for both commits

Head regression checks:

Valid shortcut edit	Invalid shortcut	Corrected shortcut

Ctrl+Alt+Y successfully toggled the main sidebar. These captures are cropped to the sidebar and composer area for privacy:

Before pressing the new shortcut	After pressing Ctrl+Alt+Y

Not shown:

• Native desktop and mobile notifications were not separately captured; this comparison exercised the real Windows server and web client.