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d778ed25a4
When a text field is inside a scrollable, and the virtual keyboard shows up, it (sometimes) makes the scrollable semantics node have a 0 extent. In that case, the scrollable node has no scroll actions attached. In the web engine, we detect that as a change of roles (from scrollable to generic) which causes a DOM mutation above the text field, so the browser shifts focus to the `<body>`. In order to avoid this bug, this PR changes how we detect a scrollable node by checking for the [`hasImplicitScrolling`](https://api.flutter.dev/flutter/dart-ui/SemanticsFlag/hasImplicitScrolling-constant.html) flag. Fixes https://github.com/flutter/flutter/issues/154741
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