回退页面出现闪现前一个 native 页面问题

> 现象: 打开多个 native flutter 混合页面，点击手机底部导航栏 **查看所有应用程序那个按钮** 会闪现上一个 native 页面，如果不闪现，此时点击返回按键，无论 debug/release 都会闪现上一个 native 页面并恢复正常，此时控制台报下面的错误

**重要** 容器 theme android:windowIsTranslucent 为 true, 以实现侧滑退出, 估计问题就在这里
```
true
```

https://user-images.githubusercontent.com/7344437/103996025-3a6bec00-51d4-11eb-8e1e-91494c68a5ea.mp4

```
{
"flutterSdkVersion": "1.22.4"
}
```

```
flutter_boost:
git:
url: 'https://github.com/alibaba/flutter_boost.git'
ref: 'v1.22.4-hotfixes'
```

```
% flutter doctor -v
[✓] Flutter (Channel unknown, 1.22.4, on Mac OS X 10.15.7 19H2 darwin-x64, locale zh-Hans-CN)
• Flutter version 1.22.4 at /Users/krmao/fvm/versions/1.22.4
• Framework revision 1aafb3a8b9 (8 weeks ago), 2020-11-13 09:59:28 -0800
• Engine revision 2c956a31c0
• Dart version 2.10.4

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
• Android SDK at /Users/krmao/sdks/android/sdk
• Platform android-30, build-tools 30.0.0
• ANDROID_HOME = /Users/krmao/sdks/android/sdk
• Java binary at: /Applications/Android Studio 4.1.1.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.2, Build version 12B45b
• CocoaPods version 1.10.0

[!] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio 4.1.1.app/Contents
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] Android Studio (version 3.6)
• Android Studio at /Applications/Android Studio 3.6.3.app/Contents
• Flutter plugin version 49.0.1
• Dart plugin version 192.8052
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] IntelliJ IDEA Ultimate Edition (version 2019.3.3)
• IntelliJ at /Applications/IntelliJ IDEA.app
• Flutter plugin version 45.1.2
• Dart plugin version 193.6494.35

[!] VS Code (version 1.52.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
✗ Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (1 available)
• CLT AL01 (mobile) • AKC7N19118000852 • android-arm64 • Android 10 (API 29)

! Doctor found issues in 2 categories.
```

Reproduce the Android scenario with multiple native/Flutter hybrid pages using Flutter 1.22.4 and the v1.22.4-hotfixes branch. Start by examining the behavior around the container theme's android:windowIsTranslucent setting and the system recent-apps and back-navigation actions. Done means the previous native page no longer flashes in either debug or release builds.

Written by the indexing model from the issue text.