fix(webview): route code actions to the last active chat

[WebMad]

Related GitHub Issue

Closes #1944.

Description

Remember the last Zoo Code chat the user interacted with and route editor code actions to that provider, rather than selecting a visible view by registration order. Moving focus to the source editor no longer loses the intended chat destination.

• Add an extension-scoped focus tracker shared by sidebar and editor-tab providers. Track pointer and keyboard interactions, not passive window activation or programmatic focus.
• Resolve the code-action destination once and execute on that provider. Keep the existing provider/sidebar fallback when no tracked chat remains available.
• Share the tracker when opening editor-tab chats, including the extension API path, and preserve routing for Explain, Fix, Improve, and New Task commands.
• Dispose tracker registrations with their views and ignore stale callbacks from disposed registrations. Release each listener independently, log cleanup failures, and continue cleaning the remaining listeners/views. Drain subscription ownership before invoking callbacks to keep repeated and reentrant disposal idempotent; also contain cleanup errors when a view closes during listener registration. Remove the redundant tracked-set clear call identified by mutation testing.
• Prevent unfocused chats from stealing editor focus during mount, visibility updates, or delayed input re-enablement, while preserving explicit input-focus requests.
• Add regression coverage and update provider-construction test fixtures for the shared tracker dependency.

This improves reliability and the multi-chat editing experience. No persisted settings or task-lifecycle transitions are changed.

Test Procedure

Automated validation completed locally on macOS:

• Backend: 26 suites, 666 tests passed, covering activation commands, focus tracking, provider routing/disposal, affected task fixtures, VS Code test helpers, and extension API callers.
• Webview UI: 3 suites, 126 tests passed, covering app interaction notifications and chat/input focus behavior.
• Additional test-only coverage: 10 new test cases for tab-opening command wiring, activation ownership/isolation, API provider selection and failure propagation, plus stronger tracker listener-cleanup and stale-callback assertions.
• The focused tracker suite records 100% line, branch, and function coverage. Local fault injection verified that the added tests catch all 8 meaningful surviving/uncovered extension mutations identified by the initial CI report. Each injected fault was restored; production code is unchanged by the coverage commit.
• Cleanup follow-up adds 5 regression cases for either listener failing, all listeners failing across multiple views, reentrant disposal, and failure during registration-time view closure. The four error-path cases were confirmed failing before the fix; all 13 tracker tests now pass with 100% line, branch, and function coverage.
• The redundant tracked-set clear operation flagged by the initial mutation report has been removed. The initial webview advisory (replacing an empty effect dependency list with a constant dependency) remains behavior-equivalent; no implementation-detail assertion was added solely to kill it.
• Repository-wide lint and type checks passed through the commit and push hooks.
• Changed-file formatting and whitespace checks passed; lint suppression data is unchanged.

Manual verification procedure for reviewers (not performed in this session):

1. Keep the Zoo Code sidebar, an editor-tab chat, and a source editor visible in separate groups.
2. Interact with the sidebar chat, move to the source editor, select code, and invoke Add to Context. Only the sidebar draft should receive the selection.
3. Repeat after interacting with the editor-tab chat. Only that chat draft should receive the selection.
4. Close the last active chat and verify Add to Context still works through the existing fallback.
5. Confirm passive chat visibility updates do not steal source-editor focus, while an explicit input-focus request still focuses the target chat.

Pre-Submission Checklist

• Issue Linked: Linked to [BUG] Add to Context should target the last active Zoo Code webview #1944. The issue is currently unassigned; maintainer approval/assignment is not claimed.
• Scope: One multi-chat routing/focus fix; unrelated local debug-launch changes are excluded.
• Self-Review: Reviewed routing, shared tracker ownership, disposal behavior, fallback, and regression tests.
• Testing: Added/updated regression coverage; all selected tests passed.
• Documentation Impact: No user-facing documentation updates required.
• Contribution Guidelines: Reviewed the contribution guidelines.

Visual Snapshots

Not applicable: behavior-only routing and focus changes; no layout, theme, or static rendered-state changes.

Documentation Updates

No documentation updates are required.

Additional Notes

• Prepared with AI assistance. Automated validation above is distinguished from the unperformed manual UI checks.
• Local tooling reported Node 24.7.0 versus the repository's requested Node 22.23.1, and installed Vitest 4.1.9 versus declared 4.1.11. Selected tests, lint, formatting, and type checks passed in that environment; CI remains authoritative for the pinned toolchain.

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• src/activate/__tests__/handleTask.spec.ts
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• src/activate/handleTask.ts
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• src/core/webview/ClineProvider.ts
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For persisted settings, verify the complete schema/storage/runtime/webview round trip, shared default semantics, and focused true plus false/unset tests.

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• src/core/webview/ClineProvider.ts
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• src/activate/handleTask.ts
• src/activate/__tests__/handleTask.spec.ts
• src/activate/__tests__/registerCodeActions.spec.ts
• src/core/webview/ClineProvider.ts
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• src/core/webview/ClineProvider.ts
• src/core/webview/__tests__/ClineProvider.spec.ts

🔇 Additional comments (9)

src/core/webview/ClineProvider.ts (3)

907-912: LGTM!

---

953-976: LGTM!

---

1079-1079: LGTM!

src/core/webview/__tests__/ClineProvider.spec.ts (1)

596-598: LGTM!

Also applies to: 674-686, 829-890

src/activate/resolveChatProvider.ts (1)

4-10: LGTM!

src/activate/handleTask.ts (1)

26-26: LGTM!

src/activate/registerCodeActions.ts (1)

57-57: LGTM!

src/activate/__tests__/registerCodeActions.spec.ts (1)

21-23: LGTM!

Also applies to: 99-148

src/activate/__tests__/handleTask.spec.ts (1)

15-17: LGTM!

Also applies to: 84-119

---

📝 Summary

Summary by CodeRabbit

• New Features
  • Chat and code-action requests go to the most recently interacted-with visible chat, including chats opened in tabs.
  • Starting a task in a new tab sends it to that tab’s chat; otherwise, it goes to the sidebar chat.
  • When the most recently interacted-with chat isn’t visible, requests use the available default chat.
  • Pointer and keyboard interactions determine which chat receives subsequent requests.
• Bug Fixes
  • Chat inputs no longer steal focus when their webview is inactive or the user is interacting elsewhere.

Walkthrough

The webview reports pointer and keyboard interactions as focus messages. The extension tracks the provider for the latest interaction and routes code actions and new tasks through it. Chat input focus paths now check document focus.

Changes

Webview focus tracking and provider routing

Layer / File(s)	Summary
Report interaction and gate input focus packages/types/src/vscode-extension-host.ts, webview-ui/src/App.tsx, webview-ui/src/components/chat/*, webview-ui/src/__tests__/*, webview-ui/src/components/chat/__tests__/*	The webview posts webviewDidFocus for pointer and keyboard interactions. Chat input focus paths check document.hasFocus(). Tests cover interaction reporting and focus behavior.
Track focused providers and handle actions src/core/webview/WebviewFocusTracker.ts, src/core/webview/ClineProvider.ts, src/core/webview/__tests__/*, src/core/task/__tests__/*, src/test-utils/*	WebviewFocusTracker records the provider for the latest valid focus message and clears it on disposal. ClineProvider.handleCodeAction now operates on its instance. Tests cover tracking, routing, lifecycle, and updated provider fixtures.
Pass the tracker through extension commands src/activate/handleTask.ts, src/activate/registerCodeActions.ts, src/activate/registerCommands.ts, src/activate/resolveChatProvider.ts, src/activate/__tests__/*, src/extension.ts	Activation shares the tracker with the provider and code-action registration. New-task and code-action handlers use the last active provider, with singleton fallback when needed. Editor-tab providers receive the tracker.
Create API tab providers through a factory src/core/webview/ClineProviderFactory.ts, src/extension/api.ts, src/extension/__tests__/*, src/__tests__/*, src/test-utils/provider.ts	Activation passes a ClineProviderFactory to API. When newTab is true, API.startNewTask creates the provider through the factory. Tests cover provider selection and error propagation.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant WebviewApp
  participant WebviewFocusTracker
  participant registerCodeActions
  participant ClineProvider
  WebviewApp->>WebviewFocusTracker: Send webviewDidFocus from tracked webview
  WebviewFocusTracker->>WebviewFocusTracker: Record last-focused provider
  registerCodeActions->>WebviewFocusTracker: Resolve active provider
  WebviewFocusTracker-->>registerCodeActions: Return selected provider
  registerCodeActions->>ClineProvider: Call handleCodeAction

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Merge Risk: ⚪ Minimal · up to 38d41

Code actions route to the last interacted visible chat, with fallback when that chat is hidden. No actionable merge-blocking issue is established.

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Lifecycle Resource Cleanup	⚠️ Warning	The new tracker can leave a message listener registered after cleanup fails. In WebviewFocusTracker.disposeSubscriptions, the tracker removes all subscriptions from its owned array before calling `s…	Do not discard ownership of a subscription whose disposal failed. Add a cleanup path that can retry or otherwise ensure the source unregisters the listener, and verify that a throwing disposer does not leave the callback registered after th…

✅ Passed checks (7 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue #1944 requires Add to Context to use the last-interacted live chat after focus moves to the editor, while preserving fallback behavior. WebviewFocusTracker records focus messages from tracked …
Out of Scope Changes check	✅ Passed	The tracker, activation and API provider wiring, editor-tab support, focus safeguards, cleanup handling, and related tests all support the routing and lifecycle requirements in #1944. The reviewed cha…
Regression Evidence	✅ Passed	Focused regression coverage exists at the affected layers. WebviewFocusTracker.spec.ts covers focus ordering, stale callbacks, disposal, registration-time closure, cleanup failures, and tracker isol…
Security Boundaries	✅ Passed	No concrete security-boundary failure is introduced. WebviewFocusTracker accepts only a webviewDidFocus message from a tracked view and uses it to select a provider (`src/core/webview/WebviewFocus…
Persistence Integrity	✅ Passed	No changed persistence path is present. The diff changes chat-provider routing and focus tracking; the code-action path still awaits createTask, and the API path still awaits task eviction and subse…
Title check	✅ Passed	The title clearly summarizes the main change: routing code actions to the last active chat.
Description check	✅ Passed	The description covers the linked issue, implementation, test procedure, checklist, visual-snapshot rationale, documentation impact, and additional notes. The optional video and contact sections are o…

Full details: Lifecycle Resource Cleanup

Explanation

The new tracker can leave a message listener registered after cleanup fails. In WebviewFocusTracker.disposeSubscriptions, the tracker removes all subscriptions from its owned array before calling subscription.dispose() and only logs when disposal throws (src/core/webview/WebviewFocusTracker.ts:72-79). The regression test confirms the source can still invoke the listener after its disposer throws (src/core/webview/__tests__/WebviewFocusTracker.spec.ts:87-119). If cleanup runs while the webview source remains alive, that listener remains attached and retains its callback even though the tracker no longer owns it.

Resolution

Do not discard ownership of a subscription whose disposal failed. Add a cleanup path that can retry or otherwise ensure the source unregisters the listener, and verify that a throwing disposer does not leave the callback registered after the view or tracker lifecycle ends.

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/core/webview/__tests__/ClineProviderFactory.spec.ts:
- Around line 52-53: Update the test around createInNewTab to configure distinct
provider results for factory and secondFactory, then assert each call returns
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• src/__tests__/api-subtask.spec.ts
• src/__tests__/extension.spec.ts
• src/__tests__/single-open-invariant.spec.ts
• src/core/webview/ClineProviderFactory.ts
• src/core/webview/__tests__/ClineProviderFactory.spec.ts
• src/extension.ts
• src/extension/__tests__/api-configuration.spec.ts
• src/extension/__tests__/api-delete-queued-message.spec.ts
• src/extension/__tests__/api-send-message.spec.ts
• src/extension/__tests__/api-start-new-task.spec.ts
• src/extension/__tests__/api-task-conversation-history-length.spec.ts
• src/extension/__tests__/api-terminal-profile.spec.ts
• src/extension/__tests__/api-theme-fixture.spec.ts
• src/extension/api.ts
• src/test-utils/__tests__/provider.spec.ts
• src/test-utils/provider.ts

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For persisted settings, verify the complete schema/storage/runtime/webview round trip, shared default semantics, and focused true plus false/unset tests.

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• src/extension/__tests__/api-theme-fixture.spec.ts
• src/extension/__tests__/api-delete-queued-message.spec.ts
• src/extension/__tests__/api-terminal-profile.spec.ts
• src/test-utils/__tests__/provider.spec.ts
• src/__tests__/api-subtask.spec.ts
• src/extension/__tests__/api-start-new-task.spec.ts
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• src/extension/__tests__/api-theme-fixture.spec.ts
• src/extension.ts
• src/core/webview/ClineProviderFactory.ts
• src/extension/api.ts
• src/test-utils/provider.ts
• src/extension/__tests__/api-delete-queued-message.spec.ts
• src/extension/__tests__/api-terminal-profile.spec.ts
• src/test-utils/__tests__/provider.spec.ts
• src/__tests__/api-subtask.spec.ts
• src/extension/__tests__/api-start-new-task.spec.ts
• src/extension/__tests__/api-configuration.spec.ts
• src/__tests__/extension.spec.ts
• src/core/webview/__tests__/ClineProviderFactory.spec.ts

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• src/extension/__tests__/api-theme-fixture.spec.ts
• src/extension.ts
• src/core/webview/ClineProviderFactory.ts
• src/extension/api.ts
• src/test-utils/provider.ts
• src/extension/__tests__/api-delete-queued-message.spec.ts
• src/extension/__tests__/api-terminal-profile.spec.ts
• src/test-utils/__tests__/provider.spec.ts
• src/__tests__/api-subtask.spec.ts
• src/extension/__tests__/api-start-new-task.spec.ts
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• src/__tests__/extension.spec.ts
• src/core/webview/__tests__/ClineProviderFactory.spec.ts

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• src/extension/__tests__/api-theme-fixture.spec.ts
• src/extension.ts
• src/core/webview/ClineProviderFactory.ts
• src/extension/api.ts
• src/test-utils/provider.ts
• src/extension/__tests__/api-delete-queued-message.spec.ts
• src/extension/__tests__/api-terminal-profile.spec.ts
• src/test-utils/__tests__/provider.spec.ts
• src/__tests__/api-subtask.spec.ts
• src/extension/__tests__/api-start-new-task.spec.ts
• src/extension/__tests__/api-configuration.spec.ts
• src/__tests__/extension.spec.ts
• src/core/webview/__tests__/ClineProviderFactory.spec.ts

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src/__tests__/api-subtask.spec.ts

[error] 67-67: Unexpected any. Specify a different type.

(@typescript-eslint/no-explicit-any)

---

[error] 88-88: Unexpected any. Specify a different type.

(@typescript-eslint/no-explicit-any)

🔇 Additional comments (1)

src/__tests__/extension.spec.ts (1)

173-173: 🎯 Functional Correctness

The mock does not remove the export used by activation. src/extension.ts imports registerCommands from ./activate, and src/__tests__/extension.spec.ts mocks that module with registerCommands: vi.fn(). The direct ../activate/registerCommands mock only supplies openClineInNewTab for the factory test.

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⚠️ Outside diff range comments (1)

🟡 Minor · Prefer the sidebar when the focus tracker is empty. · registerCodeActions.ts:56-58

src/activate/registerCodeActions.ts:56-58
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Prefer the sidebar when the focus tracker is empty.

When the tracker has no provider and both views are visible, this route falls back to ClineProvider.getInstance(), which can select the editor tab. The nonempty new-task route uses the same fallback, so both actions can target the tab instead of the required sidebar. Keep the tracker result first, but use one sidebar-preferring fallback for both routes.

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Review comment at @src/activate/registerCodeActions.ts around lines 56 - 58:
Update the fallback used when webviewFocusTracker.getLastActiveProvider() is
empty in both the code-action and nonempty new-task routes: preserve the tracked
provider as first choice, then use the existing sidebar-preferring provider
selection instead of ClineProvider.getInstance().

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Outside diff comments:
Review comments at @src/activate/registerCodeActions.ts:
- Around line 56-58: Update the fallback used when
webviewFocusTracker.getLastActiveProvider() is empty in both the code-action and
nonempty new-task routes: preserve the tracked provider as first choice, then
use the existing sidebar-preferring provider selection instead of
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src/core/webview/__tests__/ClineProviderFactory.spec.ts (1)

51-52: LGTM!

Also applies to: 54-55

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