fix(mobile): Stabilize thread feed layout and Markdown rendering

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{Bugbot Autofix is ON, but it could not run because the branch was deleted or merged before autofix could start.}

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{Bugbot Autofix is ON, but it could not run because the branch was deleted or merged before autofix could start.}

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{Bugbot Autofix is ON, but it could not run because the branch was deleted or merged before autofix could start.}

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{Bugbot Autofix is ON, but it could not run because the branch was deleted or merged before autofix could start.}

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

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[juliusmarminge]

Extracted from #3910.

Fixes native selectable Markdown width and stale-content behavior, keeps screenshots interactive, and stabilizes floating-composer spacing, short-content positioning, and hydration layout in the thread feed. Includes the required LegendList patch and regenerated lockfile.

Validation inherited from #3910: vp check and mobile native lint passed before the split. The full typecheck is currently blocked in this workspace by unavailable mobile dependencies (expo-blur, expo-quick-actions, and @tabler/icons-react-native).

Note

Stabilize thread feed scroll layout and fix Markdown rendering in iOS

• Fixes thread feed scroll position when content is shorter than the viewport by anchoring content under translucent headers and scrolling to end when content grows to fill the viewport.
• Adds a fillWidth prop to SelectableMarkdownText so assistant markdown messages stretch to fill the full row width.
• Refactors T3MarkdownTextShadowNode to derive content via buildContent and gate state updates with equality checks, preventing redundant re-renders.
• Patches @legendapp/list to improve end-scroll maintenance, initial scroll readiness, and keyboard-aware inset handling near translucent headers.
• Adds measured composer overlay height tracking in ThreadDetailScreen to produce a stable resting inset above the composer.
• Behavioral Change: maintainScrollAtEnd is disabled while content underflows the viewport; scroll position is instead managed by a requestAnimationFrame loop.

^{Macroscope summarized 1cd97c7.}

---

Note

Medium Risk
Large changes to vendored list scroll math and native Fabric text state on a core chat screen; regressions would show as wrong scroll position, jank, or missing markdown rather than data/security issues.

Overview
Thread feed and composer insets — The detail screen now tracks measured floating-composer overlay height, adds a fixed gap above the chrome, and passes that through keyboard/LegendList inset hooks (heightAdjustment, contentInsetEndEstimate). ThreadFeed detects when content is shorter than the viewport, pins scroll under the translucent header, turns off maintainScrollAtEnd in that case, and shows a loading overlay while hydrating without remounting the list on draft→thread transitions.

Native selectable markdown — iOS T3MarkdownTextShadowNode stops caching measure-time text in mutable fields; it rebuilds content from children in layout() and only updates native state when attributed text/ranges actually change, fixing dropped/stale text when Yoga layouts without remeasuring. A new optional fillWidth prop stretches assistant markdown rows so they reflow correctly in shrink-to-fit layouts.

LegendList patch — Extends the vendored @legendapp/list keyboard integration for leading inset (transparent header), safe-area end-inset compensation, short-content scroll clamping, and more reliable initial/end scroll behavior; lockfile patch hash updated.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This bug fix touches native iOS C++ layout code and includes substantial patches to the @legendapp/list third-party library affecting scroll behavior calculations. While the author is the primary maintainer of these files, native code changes and third-party patches to rendering infrastructure warrant human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}

[cursor]

Thread switch inset desync

Medium Severity

On selectedThreadKey change, composerOverlayHeight resets to the new thread’s baseline, but contentInsetEndAdjustment (the keyboard hook SharedValue) is not updated. Until the new composer lays out, contentInsetEndEstimate reflects the new thread while list end-inset math and the remount reportContentInset call still use the previous thread’s larger value.

Additional Locations (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx#L1491-L1497

^{Reviewed by Cursor Bugbot for commit 1cd97c7. Configure here.}