[amandeavor]

Fixes #202

Problem

When navigating between session tabs (e.g. from tab A to tab B and back to tab A), the view consistently reset to the very top of the session conversation history (scrollTop: 0), rather than staying at the bottom where active messages reside or retaining the user's reading position.

Root Causes

1. Collapsing DOM scrollTop on display: none: In PaneContent.tsx, inactive tabs are hidden via CSS display: none. When a tab becomes inactive, Chromium immediately collapses its layout, causing scrollContainerRef.current.scrollTop to report 0 by the time React's passive effect executes. As a result, the tab's savedScrollTop was overwritten with 0.
2. Missing bottom-docking state: tabUISlice only tracked savedScrollTop?: number without remembering whether the user was viewing live activity at the bottom. When switching to a tab where new activity appended, or upon initial navigation, it did not scroll to the bottom.

Solution

• Track latest valid scroll state in refs:
  • In ChatHistory.tsx, record lastScrollTopRef and wasAtBottomRef during scroll events while the container has non-zero height.
  • In the tab inactivity and unmount effects, if the container has collapsed (clientHeight === 0), fall back to the last known valid scroll position instead of reading 0.
• Persist savedAtBottom:
  • Update TabUIState, tabUISlice, and useTabUI to track savedAtBottom.
• Intelligent restore on tab activation:
  • When returning to an active tab, if the user was near the bottom (or on initial load where savedScrollTop is undefined), automatically scroll to the bottom (scrollHeight - clientHeight) so active conversation items are immediately visible.
  • If the user had deliberately scrolled up to inspect previous turns, accurately restore their manual savedScrollTop.
• Tests:
  • Added unit tests in test/renderer/store/tabUISlice.test.ts verifying savedAtBottom and scroll positions are properly stored and isolated.

Verification

• Vitest suite (tabUISlice.test.ts, tabSlice.test.ts, useAutoScrollBottom.test.ts): 47/47 passed.
• TypeScript typecheck (tsc --noEmit): Exit code 0.

Summary by CodeRabbit

• Bug Fixes
  • Chat tabs now retain their scroll position and whether they were near the bottom when switching tabs or navigating.
  • Scroll restoration waits for a usable layout and returns to the bottom when the saved state indicates the view was there.
  • When the chat view has no valid layout, saved scroll information uses the latest tracked position and bottom status.

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📥 Commits

Reviewing files that changed from the base of the PR and between aa3b279 and ead8212.

📒 Files selected for processing: 1

• src/renderer/components/chat/ChatHistory.tsx

🚧 Files skipped from review as they are similar to previous changes: 1

• src/renderer/components/chat/ChatHistory.tsx

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📝 Walkthrough

Tab UI state now includes whether the view was near the bottom. ChatHistory saves the scroll position and bottom status during tab changes and navigation. It uses the saved state to restore the view.

Changes: Tab Scroll State

Layer / File(s)	Summary
Store and expose bottom status src/renderer/store/slices/tabUISlice.ts, src/renderer/hooks/useTabUI.ts, test/renderer/store/tabUISlice.test.ts	Tab UI state stores optional bottom status with the scroll position. The hook exposes and forwards that status. Tests cover unset, true, and false values.
Track and save scroll state src/renderer/components/chat/ChatHistory.tsx	ChatHistory tracks valid scroll positions and bottom status. When a tab becomes inactive or navigation completes, it saves live values when layout is valid and tracked values otherwise.
Restore scroll position src/renderer/components/chat/ChatHistory.tsx	Restoration waits for a container with nonzero height. ChatHistory scrolls to the bottom when the saved or tracked state indicates the bottom, unless the saved state is explicitly false; otherwise, it restores the saved position.

Suggested labels: bug

Priority: ➖ Normal

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to ead82

The scroll-restoration change is ready to merge after normal checks; no outstanding issue was established.

Pre-merge checks: 2

Check name	Status	Explanation
Linked Issues check		Issue #202 asks that returning to a session tab show the bottom of its conversation, or the position the user had reached. The PR saves the latest valid scroll position and bottom state in ChatHistory…
Out of Scope Changes check		All changed files relate to per-tab scroll and bottom-docking persistence for issue #202: ChatHistory.tsx, useTabUI.ts, tabUISlice.ts, and tabUISlice.test.ts. The incremental change adds skipNextResto…

Full details: Linked Issues check

Explanation

Issue #202 asks that returning to a session tab show the bottom of its conversation, or the position the user had reached. The PR saves the latest valid scroll position and bottom state in ChatHistory.tsx (lastScrollTopRef, wasAtBottomRef). It saves both when a tab becomes inactive or unmounts, and falls back to the last tracked values when clientHeight is 0. useTabUI and tabUISlice persist savedAtBottom. On activation, the tab restores the bottom when it was at the bottom or has no saved position, and restores the saved offset otherwise. The incremental change since the previous review adds skipNextRestoreRef. It suppresses one restore pass after a navigation-completion save. The flag clears when the tab becomes inactive, so the switch-away-and-back path in the issue is not blocked. The restore body was truncated in the read, so the exact restore branch was checked only through the incremental diff and the earlier review. The tabUISlice test covers savedAtBottom values. The issue does not require tests. Its approaches are described as options, not firm requirements.

Full details: Out of Scope Changes check

Explanation

All changed files relate to per-tab scroll and bottom-docking persistence for issue #202: ChatHistory.tsx, useTabUI.ts, tabUISlice.ts, and tabUISlice.test.ts. The incremental change adds skipNextRestoreRef and moves the isThisTabActive check into an early return. Both changes concern scroll restore coordination in the same component. The commit message describes this as a scroll-restoration adjustment. No unrelated feature or unrelated code change is identified.

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🔧 ESLint

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src/renderer/components/chat/ChatHistory.tsx

Oops! Something went wrong! :(

ESLint: 9.39.5

Error: Error while loading rule 'tailwindcss/no-contradicting-classname': Could not find tailwindcss
Occurred while linting /src/renderer/components/chat/ChatHistory.tsx
at new TailwindUtils (/.eslint-tmp/node_modules/.pnpm/tailwind-api-utils@1.0.3_tailwindcss@3.4.19_tsx@4.23.15_/node_modules/tailwind-api-utils/dist/index.cjs:375:13)
at resolve (/.eslint-tmp/node_modules/.pnpm/eslint-plugin-tailwindcss@3.18.3_tailwindcss@3.4.19_tsx@4.23.15_/node_modules/eslint-plugin-tailwindcss/lib/util/customConfig.js:21:27)
at getTailwindConfig (/.eslint-tmp/node_modules/.pnpm/eslint-plugin-tailwindcss@3.18.3_tailwindcss@3.4.19_tsx@4.23.15_/node_modules/eslint-plugin-tailwindcss/lib/util/tailwindAPI.js:9:17)
at Object.create (/.eslint-tmp/node_modules/.pnpm/eslint-plugin-tailwindcss@3.18.3_tailwindcss@3.4.19_tsx@4.23.15_/node_modules/eslint-plugin-tailwindcss/lib/rules/no-contradicting-classname.js:71:26)
at createRuleListeners (/.

... [truncated 796 characters] ...

)
at Linter._verifyWithFlatConfigArray (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_jiti@1.21.7_supports-color@7.2.0/node_modules/eslint/lib/linter/linter.js:2306:15)
at Linter.verify (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_jiti@1.21.7_supports-color@7.2.0/node_modules/eslint/lib/linter/linter.js:1677:10)
at Linter.verifyAndFix (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_jiti@1.21.7_supports-color@7.2.0/node_modules/eslint/lib/linter/linter.js:2571:20)
at verifyText (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_jiti@1.21.7_supports-color@7.2.0/node_modules/eslint/lib/eslint/eslint-helpers.js:1180:45)
at readAndVerifyFile (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_jiti@1.21.7_supports-color@7.2.0/node_modules/eslint/lib/eslint/eslint-helpers.js:1321:10)

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/renderer/components/chat/ChatHistory.tsx:
- Around line 735-736: Update the scroll-restoration condition using
savedAtBottom and savedScrollTop so the navigation-completion save does not
trigger restoration when the target is within SCROLL_THRESHOLD of the bottom.
Keep the target position until the tab becomes active again, then allow
restoration to proceed.

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 0f299087-804f-4f9d-a8ac-abc40bb1be32

📥 Commits

Reviewing files that changed from the base of the PR and between 1486f20 and aa3b279.

📒 Files selected for processing (4)

• src/renderer/components/chat/ChatHistory.tsx
• src/renderer/hooks/useTabUI.ts
• src/renderer/store/slices/tabUISlice.ts
• test/renderer/store/tabUISlice.test.ts

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