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(FlutterBoost3，版本号v3.0-null-safety-release.1)，在页面A中通过打开新容器的方式打开页面B之后关闭容器B，关闭页面过程中会再闪烁一次
问题现象描述：FlutterBoost3（版本号v3.0-null-safety-release.1），在页面A中通过打开新容器的方式BoostNavigator.instance .push(url, arguments: params, withContainer: true)打开页面B之后，通过BoostNavigator.instance.pop(result)或者物理返回键关闭页面B，页面B在关闭过程中会概率性再闪烁一次。
（一）复现问题的demo：v3.0-null-safety-release.1的example就可以概率性复现问题。
（二）复现步骤如下： 1.通过sample首页点击“open flutter page”进入flutter页面； 2.在页面顶部withContainer开发打开的情况下，（页面显示"withContainer:true"）点击"image_picker demo"按钮打开新容器； 3.点击返回按钮。
说明： 我们遇到问题的过程中尝试使用最简单的页面，如只有颜色方块的UI，问题也可以复现，且在容器设置无动画的情况下问题更容易出现。
（三）复现问题过程中设备和相关版本信息： Flutter Boost Version：v3.0-null-safety-release.1 Target Platform: Android Target OS version/browser: Huawei Honor 7x（BDN-AL10）， Android9，EMUI9.1.0 Huawei mate20（HMA-AL00），HarmonyOS 2.0.0
（四）flutter doctor -v信息 [✓] Flutter (Channel stable, 2.0.6, on Mac OS X 10.15.6 19G73 darwin-x64, locale zh-Hans-CN) • Flutter version 2.0.6 at /Users/xxx/flutter_2.0.6/flutter • Framework revision 1d9032c7e1 (12 months ago), 2021-04-29 17:37:58 -0700 • Engine revision 05e680e202 • Dart version 2.12.3 • Pub download mirror https://pub.flutter-io.cn • Flutter download mirror https://storage.flutter-io.cn
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2) • Android SDK at /Users/xxx/Library/Android/sdk • Platform android-31, build-tools 30.0.2 • ANDROID_HOME = /Users/xxx/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264) • All Android licenses accepted.
[!] Xcode - develop for iOS and macOS ✗ Xcode installation is incomplete; a full installation is necessary for iOS development. Download at: https://developer.apple.com/xcode/download/ Or install Xcode via the App Store. Once installed, run: sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer sudo xcodebuild -runFirstLaunch • CocoaPods version 1.10.1
[✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.2) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
[✓] Connected device (1 available) • Chrome (web) • chrome • web-javascript • Google Chrome 100.0.4896.88
! Doctor found issues in 1 category.
