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fix(android): keep diagonal horizontal swipes inside HTML blocks - #21652
On Android, a sideways swipe across an inline HTML block can start scrolling the conversation as soon as the finger drifts vertically. It stops following the finger even when the gesture is almost horizontal.
Change
The Android WebView patch waits for the platform touch threshold, then keeps a horizontal gesture with the WebView until the finger lifts. This applies even when the page only overflows horizontally.
The existing nested-scroll setting still controls vertical gestures. Pages with no vertical overflow pass them to the conversation. Taller pages keep them until their scroll edge. Multi-touch and zero-range iframe handling remain in place.
Scope and approval
This is a focused fix for an obvious scrolling bug in existing inline HTML blocks, submitted without a prior issue under the small bug-fix exception. It follows the vertical-scroll work in #17211, which closed#16989. Those addressed vertical trapping; this PR addresses horizontal swipes interrupted by slight vertical drift.
The gesture change is Android-only. The inline HTML overflow detector and vertical-scroll setting are unchanged. Full-screen HTML continues to receive its vertical gestures without a scrolling parent. Web, desktop, providers, and wire contracts need no changes. The lockfile changes are the regenerated WebView patch hash and dependent peer hashes.
Verification
The Samsung Galaxy S23 recordings below show manual testing of the before and after builds on a physical device. The emulator checks below used a rebuilt Android development client with the updated native patch.
Verified straight and slightly diagonal vertical swipes in both directions over the horizontal table still scroll the conversation. The diagonal swipes move 500 physical pixels vertically and 35 sideways, about 4 degrees off vertical.
Made the test page taller and verified slightly diagonal vertical scrolling stays inside it until its bottom edge, then passes to the conversation.
Passed mobile typecheck, focused lint and formatting, and git diff --check.
The native build used a local generated CMake cache correction to link the bundled Android Oniguruma library. No build-system changes are included. iOS and live MCP iframe/pinch interactions were not exercised.
Horizontal scrolling
The emulator video shows identical scripted swipes before and after, at their original speed. Both recordings include Android's native touch pointer and trail. Before, the conversation moves and the two swipes reach March through May. After, the conversation stays still and the same swipes reach June through August.
android-diagonal-scroll-before-after.mp4
Vertical scrolling (unchanged)
The emulator comparison shows straight and slightly diagonal vertical swipes in both directions. The conversation scrolls in both builds.
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Walkthrough
The Android WebView patch changes how touch gestures are classified and when the parent can intercept them. The inline HTML component comment describes the updated horizontal and vertical drag behavior.
Changes: Android WebView gesture handling
Layer / File(s)
Summary
Gesture interception and documentation patches/react-native-webview@14.0.1.patch, apps/mobile/src/features/threads/HtmlRenderWebView.tsx
The patch obtains the platform touch-slop threshold, tracks gesture state, and evaluates parent interception for every touch event. It preserves multi-touch and horizontal gestures, and yields vertical gestures based on nested scrolling and the WebView’s scroll edge. The component comment describes the updated behavior.
Horizontal swipes remain with the WebView once classified, and no unresolved merge-blocking issue was established.
Security architecture risk: Low · up to 598ad
No new privileged access or content interface was identified. The change is limited to Android gesture handling, but cancellation and subsequent parent handoff were not verified against platform behavior.
Retained concerns
No architecture-level concerns identified.
Security review details
Security Blast Radius
inferred — The behavioral scope is broader than inline HTML blocks because interception now runs regardless of nested-scrolling status. The changed mechanism governs touch ownership within Android WebViews; no added credential, service, data-store, or native bridge authority appears in the compared changes.
Trust Boundaries and Controls
observed — Existing page-reported overflow messages are parsed for the expected type and boolean fields before changing scrolling configuration. Existing navigation and external-window handling remain unchanged. The gesture patch consumes motion geometry and scroll state rather than adding message-based native capabilities.
Pre-merge checks: 4
Check name
Status
Explanation
Title check
The title clearly and concisely describes the primary Android gesture-handling fix for diagonal horizontal swipes in HTML blocks.
Description check
The description includes the required Problem, Change, Scope and approval, and Verification sections. It explains expected behavior, implementation scope, manual and emulator checks, evidence, limitat…
Linked Issues check
No active directly linked issue remains. Issue #16989 is closed and provides historical context only. No linked-issue coding requirements apply.
Out of Scope Changes check
The changes are limited to Android WebView touch-interception logic and its related comment. The patch implements the stated horizontal gesture behavior and preserves vertical handoff, multi-touch han…
Full details: Description check
Explanation
The description includes the required Problem, Change, Scope and approval, and Verification sections. It explains expected behavior, implementation scope, manual and emulator checks, evidence, limitations, and the agent used.
Full details: Out of Scope Changes check
Explanation
The changes are limited to Android WebView touch-interception logic and its related comment. The patch implements the stated horizontal gesture behavior and preserves vertical handoff, multi-touch handling, and zero-range handling. No unrelated change is demonstrated. The excluded lockfile is not used as scope evidence.
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changed the title
fix(mobile): keep diagonal horizontal swipes inside HTML blocks
fix(android): keep diagonal horizontal swipes inside HTML blocks
Oct 19, 2026
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Actionable comments posted: 1
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @patches/react-native-webview@14.0.1.patch:
- Line 44: Update the horizontal gesture handling around the displacement
comparison so that, once horizontal intent is established after the touch
threshold, it remains latched until the gesture ends. Clear the latched state on
ACTION_UP and ACTION_CANCEL, preserving ownership of the WebView touch stream
even if later vertical displacement becomes larger.
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ℹ️ Review info⚙️ Run configuration
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Review profile: CHILL
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Run ID: 69bee149-9cf2-4da2-ba44-c9b6dfef709b
📥 Commits
Reviewing files that changed from the base of the PR and between 07d174b and 0466ce9.
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Please review the current head, d3999d2. Automatic review was skipped because the PR is a draft. Manual testing favored the restored touch-threshold and horizontal-gesture latch implementation.
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this takeover kept the contributor's native gesture fix and merged current github/main with a merge commit, without rebasing or force-pushing. the lockfile was refreshed so the patched react-native-webview hash matches the current patch.
head: 17f06e14d190f2fb7f6a6db630c65fe490af2434
verification passed in github: 28 checks successful, zero pending, zero failing, and no conflicts. blacksmith typecheck and lint passed; the broad test run passed 1,012 tests and only hit the unrelated missing libsecret-1 host dependency. vp run check:changed could not compute a merge base in its remote snapshot after the required merge commit.
native Android interaction remains unverified on this VM because no device is attached. Maria can merge when the native review requirement is satisfied.
no changed runtime behavior could be verified on this linux boat vm. i inspected the current diff, description, discussion, commit authors, and check status at head 7619c4d053ad5e8cd7e11768ff2ea6c54308c054. the pr is open and its pr commits have no authorship by juliusmarminge or t3dotgg. cafe reports 27 successful checks, zero pending and zero failing; that is existing ci status, not runtime proof.
the changed execution path is android's native RNCWebView.onTouchEvent: a user opens an inline html block in a mobile thread and swipes sideways with vertical drift. the patch retains horizontal ownership after the platform touch threshold. the other source change is a comment; lockfile changes propagate the patch hash.
availability transcript from this run:
$ adb devices -l
List of devices attached
[no devices]
$ ls ~/.android/avd
No such file or directory
$ command -v emulator
[not installed]
t3 device_list:
Agent device access is turned off for this environment.
Not verified
the original bug on github/main, the changed behavior on the pr head, and neighboring vertical feed handoff, vertical document edge handoff, pinch, and iframe scrolling remain unverified. there is no usable android device here. the repository's mobile verification skill explicitly requires stopping verification when device tools or devices are unavailable. no worktree install, dev server, provider turn, substitute chrome recording, or screenshot was produced: chrome and web provider turns cannot execute this android java interception path. existing contributor recordings were not treated as verification from this run.
verification needs a rebuilt native android client for both revisions, real codex gpt-6.1-sol turns producing matching wide html blocks, and native swipe checks with before/after captures. ios was also not exercised. no source edits, pushes, labels, or pr state changes were made.
Verified on Android emulator (API 35) against a real dev server
no runtime verification completed in this run. the heading records the requested target, not a passing result.
i inspected the current diff and discussion at 7619c4d053ad5e8cd7e11768ff2ea6c54308c054. the pr is open, changes android native WebView interception, and its pr commits have no authorship by juliusmarminge or t3dotgg. existing ci reports 27 successful checks, zero pending, and zero failing. these checks do not prove native gesture behavior.
the android emulator executable is installed at /home/user/android/emulator/emulator, and adb reports no attached devices. both live T3 device_list and device_open returned:
Device support is off. Ask the user to enable it in the Device panel before installing or starting device tools.
the repository's test-t3-mobile skill explicitly requires stopping verification when T3 device tools or the selected device are unavailable. no emulator, backend, Metro, native install, provider turn, or evidence capture was started. no source changes or pushes were made. enable device access for this environment in the Device panel before retrying.
Not verified
ios; the original behavior on github/main; diagonal horizontal swipes on this head; neighboring vertical conversation scrolling and vertical document edge handoff; pinch and iframe scrolling; pairing and real Codex gpt-6.1-sol turns against the dev server. there are no screenshots or recordings from this run, and existing contributor evidence was not treated as new verification.
Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.
no changed runtime behavior could be verified on this linux boat vm. i read the diff, description, discussion, inline reviews and commit authors at head 187ac32f33054169062d476123337f7a124a489e. the pr is open, with no pr commits authored by juliusmarminge or t3dotgg. git.cafe identifies it as https://git.cafe/pingdotgg/t3code/pulls/21652.
this changes android native RNCWebView.onTouchEvent interception: open inline html in a mobile thread, then swipe horizontally with slight vertical drift. horizontal intent is latched after the platform touch threshold. the mobile component change is a comment, and the lockfile propagates the native patch hash. existing ci reports 28 successful checks, zero pending and zero failing; this is not runtime proof.
availability checks this run:
$ adb devices -l
List of devices attached
[no devices]
$ command -v emulator
[not on PATH]
t3 device_list:
Agent device access is turned off for this environment.
Not verified
the original bug on github/main, diagonal horizontal swipes on this head, vertical conversation scrolling, document edge handoff, pinch and iframe gestures remain unverified. there is no attached android device, and T3 device access is disabled. .agents/skills/test-t3-mobile/SKILL.md explicitly says to stop verification when device tools or the selected device are unavailable, without installing or switching automation systems.
no worktree install, backend, Metro, native client, provider turn, screenshot or recording was started. desktop chrome cannot execute this android java path, so web-only evidence would not verify it. real Codex gpt-6.1-sol turns and matching before/after native captures remain required with a rebuilt android client for each revision. ios was not exercised. existing contributor evidence was not treated as verification from this run.
no source changes, pushes, labels or pr state changes were made. result: unverifiable in this environment.
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📱 Native ChangeChanges the native fingerprint; merging blocks production OTAs until a new store build ships.size:L100-499 changed lines (additions + deletions).vouch:unvouchedPR author is not yet trusted in the VOUCHED list.
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Problem
On Android, a sideways swipe across an inline HTML block can start scrolling the conversation as soon as the finger drifts vertically. It stops following the finger even when the gesture is almost horizontal.
Change
The Android WebView patch waits for the platform touch threshold, then keeps a horizontal gesture with the WebView until the finger lifts. This applies even when the page only overflows horizontally.
The existing nested-scroll setting still controls vertical gestures. Pages with no vertical overflow pass them to the conversation. Taller pages keep them until their scroll edge. Multi-touch and zero-range iframe handling remain in place.
Scope and approval
This is a focused fix for an obvious scrolling bug in existing inline HTML blocks, submitted without a prior issue under the small bug-fix exception. It follows the vertical-scroll work in #17211, which closed #16989. Those addressed vertical trapping; this PR addresses horizontal swipes interrupted by slight vertical drift.
The gesture change is Android-only. The inline HTML overflow detector and vertical-scroll setting are unchanged. Full-screen HTML continues to receive its vertical gestures without a scrolling parent. Web, desktop, providers, and wire contracts need no changes. The lockfile changes are the regenerated WebView patch hash and dependent peer hashes.
Verification
The Samsung Galaxy S23 recordings below show manual testing of the before and after builds on a physical device. The emulator checks below used a rebuilt Android development client with the updated native patch.
git diff --check.The native build used a local generated CMake cache correction to link the bundled Android Oniguruma library. No build-system changes are included. iOS and live MCP iframe/pinch interactions were not exercised.
Horizontal scrolling
The emulator video shows identical scripted swipes before and after, at their original speed. Both recordings include Android's native touch pointer and trail. Before, the conversation moves and the two swipes reach March through May. After, the conversation stays still and the same swipes reach June through August.
android-diagonal-scroll-before-after.mp4
Vertical scrolling (unchanged)
The emulator comparison shows straight and slightly diagonal vertical swipes in both directions. The conversation scrolls in both builds.
android-vertical-scroll-before-after.mp4
Manual testing on Samsung Galaxy S23
scroll-after.mp4
Made with GPT-6-astra in the Codex harness.