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[web] Scroll is not recognized by the browser #69529

Description

@jamesblasco

Steps to Reproduce

Flutter is painted on a canvas and the browser doesn't detect the scroll.

This causes problems when the native browser uses the scroll to perform their own actions.

Current problems:

Current behavior Expected behavior (would also need to scroll)
  • iOS scroll to top by tapping on the status bar doesn't work. A feature available for any website in any ios browser or WKWebView

  • iOS GoogleMaps, Google Assistant, Facebook & Facebook Messenger displays in-app websites inside a draggable modal. Because of scroll is not detected, the modal is closed instead of scrolling upwards.

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    P2Important issues not at the top of the work listcustomer: crowdAffects or could affect many people, though not necessarily a specific customer.engineflutter/engine related. See also e: labels.f: scrollingViewports, list views, slivers, etc.found in release: 3.19Found to occur in 3.19found in release: 3.20Found to occur in 3.20frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-webWeb applications specificallyteam-webOwned by Web platform teamtriaged-webTriaged by Web platform team

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