WebviewScaffold widget in bordered container

I want to make rounded corner of my webview with your plugin but its not working correctly. Official Flutter plugin is working with rounded corner but official plugin not working when we use keyboard.
## System info

Issue occurs on: Android, iOS(Not having Mac)
Plugin version: 0.3.10+1
Flutter doctor output:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Linux, locale en_IN)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Android Studio (version 3.5)
[✓] Connected device (2 available)

• No issues found!

## Steps to Reproduce

My Code:

Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.blue,
title: Text('Flutter'),
titleSpacing: 0.0,
),
body: Container(
margin: EdgeInsets.all(16.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(12.0),
boxShadow: [BoxShadow(blurRadius: 2, color: Colors.red)]),
child: ClipRRect(
borderRadius: BorderRadius.circular(12.0),
child: WebviewScaffold(
url: 'https://flutter.dev/',
resizeToAvoidBottomInset: true,
),
),
),
);
}


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首先，在 Android 和 iOS 上使用 plugin 版本 0.3.10+1，复现所提供的 Scaffold、ClipRRect 和 WebviewScaffold 示例。将带边框的 WebView 和键盘行为与官方 plugin 所述的行为进行比较；当圆角能够正确渲染且不会失去所需的键盘行为时，即表示完成。

由索引模型根据 Issue 内容生成。