fix(gui): don't drop batched messages after a <think> block - #2
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The `<think>...</think>` fast-path in the `streamUpdate` reducer ended in `return` rather than `continue`. Since it sits inside a `for (const message of action.payload)` loop, returning exits the reducer entirely and silently discards every remaining message in the batch, not just the one being handled. The sibling early-exit for redacted thinking uses `continue`, and nothing runs after the loop, so `continue` is the intended control flow here. This went unnoticed because every existing `streamUpdate` test dispatches a single-element payload, where `return` and `continue` are indistinguishable. The added test uses a two-message payload and fails on `return`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📒 Files selected for processing (1)
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe stream update reducer now preserves later assistant messages after an earlier message closes a ChangesStream update handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This localized fix preserves messages that follow a block in batched responses and adds regression coverage; no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 1
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Inline comments:
In `@gui/src/redux/slices/sessionSlice.test.ts`:
- Around line 137-161: Update the test fixture to include the assistant
placeholder created by submitEditorAndInitAtIndex, preserving the initial user
entry and adding the assistant entry before dispatching streamUpdate. Adjust the
assertions so reasoning is checked on history[1] and the combined message
content on history[2], matching the production history layout.
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gui/src/redux/slices/sessionSlice.test.tsgui/src/redux/slices/sessionSlice.ts
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Pull request overview
Fixes a streaming reducer control-flow bug in the GUI session state where batched messages could be silently dropped after encountering a <think>...</think> block, and adds a regression test to ensure subsequent messages in the same batch are preserved.
Changes:
- Replaces an unintended
returnwithcontinueinside thestreamUpdatemessage loop to avoid discarding remaining batched messages. - Adds a regression test covering a two-message payload where the first contains a
<think>block and the second continues the assistant output.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| gui/src/redux/slices/sessionSlice.ts | Fixes reducer loop control flow to continue processing remaining messages after handling the <think> fast-path. |
| gui/src/redux/slices/sessionSlice.test.ts | Adds a test to ensure later messages in the same streamed batch aren’t dropped after a <think> block. |
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The batch-drop regression test seeded history with only a user message,
but submitEditorAndInitAtIndex (sessionSlice.ts) appends an empty
assistant placeholder alongside the user turn before streaming starts.
Because streamUpdate attaches `reasoning` to the last history item, the
short fixture parked reasoning on the *user* message — a state the
reducer can never produce in production:
user-only fixture:
[0] user "This is a test." reasoning="Reasoning here."
[1] assistant "First part. Second part."
with placeholder:
[0] user "This is a test."
[1] assistant "" reasoning="Reasoning here."
[2] assistant "First part. Second part."
Add the placeholder and shift the assertions to history[1]/history[2].
Also assert history[1].message.role, so the fixture cannot regress to
attaching reasoning to a user turn without failing.
The fixture is adjusted in this test only; createInitialState() is shared
with nine other tests that depend on its current shape.
Still mutation-verified: replacing `continue` with `return` fails this
test alone ('First part.' vs 'First part. Second part.'), other 9 pass.
tsc --noEmit clean.
Reported by CodeRabbit on #2.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Ports continuedev#13163 (filed upstream, which is read-only and will never merge it).
Description
The
<think>…</think>fast-path in thestreamUpdatereducer ended inreturnrather thancontinue. It sits insidefor (const message of action.payload), so returning exits the reducer entirely and silently discards every remaining message in the batch.The sibling early-exit for redacted thinking a few lines above uses
continue, and nothing runs after the loop, socontinueis the intended control flow.Impact is limited to payloads carrying more than one message, where content following a
<think>block in the same batch is dropped.Tests
Added to
gui/src/redux/slices/sessionSlice.test.ts: a two-message payload where the first carries a<think>block and the second continues the answer.Went unnoticed because all 11 existing
streamUpdatetests dispatch single-element payloads, wherereturnandcontinueare indistinguishable.Mutation-verified: with
returnthe new test fails ('First part.'vs'First part. Second part.'); withcontinueall 10 pass and the other 9 are unaffected.Summary by CodeRabbit
Bug Fixes
Tests