FlutterActivityLaunchConfigs.BackgroundMode.transparent makes safeArea not work

[Jianming Wan]

I am adding flutter to Android with the guide https://github.com/flutter/flutter/wiki/Experimental:-Add-Flutter-Activity;

FlutterActivity.CachedEngineIntentBuilder builder = FlutterActivity.withCachedEngine(engName);

// builder.backgroundMode(FlutterActivityLaunchConfigs.BackgroundMode.transparent);  //1
// builder.backgroundMode(FlutterActivityLaunchConfigs.BackgroundMode.opaque);  //2
Intent intent = builder.build(activity.getApplicationContext());
activity.startActivity(intent);

but I found that when start the activity with  builder.backgroundMode(FlutterActivityLaunchConfigs.BackgroundMode.transparent);  then SafeArea not work anymore; 
in fact, if I comment this line, then there is always SafeAre ;

I am in 

[✓] Flutter (Channel beta, v1.12.13+hotfix.1, on Mac OS X 10.15.1 19B88, locale zh-Hans-CN)

    • Flutter version 1.12.13+hotfix.1 at /opt/google/flutter

    • Framework revision 5b07015393 (24 hours ago), 2019-12-03 00:12:02 -0800

    • Engine revision c1e322b685

    • Dart version 2.7.0

[Matt Carroll]

Hi, would you mind filing a bug for this on GitHub?

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