fix(chat): guard history restore races

[zhangmo8]

Summary

• prevent an in-flight older-history load from compensating the scroll position after a session switch
• invalidate completions using both the active session ID and restore request ID across asynchronous boundaries
• add a regression test for switching sessions while older history is still loading

Validation

• pnpm exec vitest --config vitest.config.renderer.ts test/renderer/components/ChatPage.test.ts --run
• pnpm run i18n
• pnpm run typecheck:web
• git diff --check origin/dev...HEAD

UI layout

No visual layout changes.

Before
[Session A: history load pending] --resolves after--> [Session B scroll position overwritten]

After
[Session A: history load pending] --resolves after--> [Session B unchanged]

Summary by CodeRabbit

• Bug Fixes

  • Improved chat history loading when switching sessions, preventing stale scroll adjustments from moving the conversation unexpectedly.
  • Preserved the current scroll position while deferred messages and session data finish loading.

• Tests

  • Added coverage for session switching during deferred history loading.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d08507a3-b493-4579-90cd-15f45b8e2db6

📥 Commits

Reviewing files that changed from the base of the PR and between 65bd1d6 and c2c63a0.

📒 Files selected for processing (2)

• src/renderer/src/pages/ChatPage.vue
• test/renderer/components/ChatPage.test.ts

---

📝 Walkthrough

Walkthrough

loadOlderMessagesAtTop now ignores stale asynchronous history loads when the session or restore request changes. A regression test verifies that switching sessions leaves the existing scroll position unchanged until the new session load completes.

Changes

Chat history session safety

Layer / File(s)	Summary
Guard history scroll compensation src/renderer/src/pages/ChatPage.vue, test/renderer/components/ChatPage.test.ts	loadOlderMessagesAtTop checks session and restore request identity before and after asynchronous work, with a test covering session switching during deferred history loading.

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

Possibly related PRs

• ThinkInAIXYZ/deepchat#1737: Both changes modify ChatPage scroll anchoring around older-history loading and session restoration.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: fixing chat history restore race conditions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/chat-history-restore-race

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}