feat(RevenueCatUI): arbitrate web_view drag gestures with the paywall scroll

[AlvaroBrey]

Checklist

• If applicable, unit tests
• If applicable, create follow-up issues for purchases-ios and hybrids

Motivation

A web_view embedded in the paywall double-scrolls: dragging interactive or scrollable content (a map, an inner list) also scrolls the whole paywall.

Description

PaywallWebView decides, once per drag, whether the web_view or the paywall scroll owns the gesture, via requestDisallowInterceptTouchEvent (claim-once, since Compose won't hand a gesture back). The web_view claims only when its content consumes the drag:

• a per-gesture JS probe reports inner overflow scrollers and touch-action maps — the signals native code can't see — over the existing secure message channel;
• native canScrollVertically/Horizontally covers root/page scroll;
• otherwise the paywall scrolls.

No-ops to native scrollability on old WebViews without the probe features. Verified on device (inner list, carousel, map) plus unit tests for the decision logic.

---

Note

Medium Risk
Touch handling and injected JS affect all paywall web_views; behavior degrades to native scroll-only on older WebViews, with edge cases where JS-only gesture blocking isn't detected.

Overview
Fixes double-scroll when dragging inside paywall web_view content (maps, inner lists, carousels) by deciding once per drag whether the WebView or the outer paywall scroll owns the gesture.

Introduces PaywallWebView, which calls requestDisallowInterceptTouchEvent only when shouldWebViewOwnGesture says the WebView should own the drag (respecting touch slop and dominant axis). A WebViewGestureOwnershipProbe injects document-start JS and uses WebMessageListener to report per-touch whether inner scrollers or non-default touch-action need the gesture; that verdict overrides native checks when it says "own," otherwise root canScrollVertically/Horizontally decides.

WebViewComponentView swaps plain WebView for PaywallWebView, wires install/teardown of the probe on release, and disableTapHighlight no longer falls back to * when origin is unknown—it skips injection instead (tests updated). Unit tests cover arbitration rules and probe install behavior.

^{Reviewed by Cursor Bugbot for commit ab663d1. Bugbot is set up for automated code reviews on this repo. Configure here.}

[AlvaroBrey]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 4f4b622. Configure here.}

[AlvaroBrey]

@cursor review

[cursor]

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

There are 2 total unresolved issues (including 1 from previous review).

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit d3a11d4. Configure here.}

[AlvaroBrey]

• feat(paywalls): enable web_view component (8) #3787
• Hide autoplay web_view video until it plays #3824
• feat(RevenueCatUI): arbitrate web_view drag gestures with the paywall scroll #3823 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[ajpallares]

Nice one! Two small comments, non-blocking at all