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BackdropFilter doesn't work as child of Opacity or other Filter widgets (was iOS dialogs fade in without blur) #31706

@Hixie

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@Hixie

I'm on Android, using the Gallery, Cupertino / Alerts demo. When I tap a button, the dialogs fade in, but they don't blur the background until the animation is over, at which point the blur effect pops in.

Testing with v1.5.4.

cc @xster

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    P2Important issues not at the top of the work lista: animationAnimation APIsa: fidelityMatching the OEM platforms betterdependency: skiaSkia team may need to help usengineflutter/engine related. See also e: labels.f: cupertinoflutter/packages/flutter/cupertino repositoryfound in release: 3.19Found to occur in 3.19found in release: 3.22Found to occur in 3.22frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onteam-designOwned by Design Languages teamtriaged-designTriaged by Design Languages team

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