commit 26889ce846ad739968e942482a64ade7134b7495
author Maurice Parrish <10687576+bparrishMines@users.noreply.github.com> Tue Jul 25 10:33:22 2023 -0400
committer GitHub <noreply@github.com> Tue Jul 25 14:33:22 2023 +0000
tree eb725082c85f88aadd27ecceb79c251ec75c26ab
parent 2481d92950890edbd1effa41bcd7fd3579d63dab

[webview_flutter_android][webview_flutter_wkwebview] Fixes bug where `PlatformWebViewWidget` doesn't rebuild when the controller changes (#4533)

In a scenario where a `WebViewWidget` was updated with a new `WebViewController`, the native `WebView` from the new controller would not be shown. e.g.

```dart
 class WebViewExample extends StatefulWidget {
  const WebViewExample({super.key});

  @override
  State<WebViewExample> createState() => _WebViewExampleState();
}

class _WebViewExampleState extends State<WebViewExample> {
  late WebViewController controller;

  @override
  void initState() {
    super.initState();
    controller = WebViewController()
      ..loadRequest(Uri.parse('https://flutter.dev'));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Flutter Simple Example')),
      body: WebViewWidget(controller: controller),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            controller = WebViewController()
              ..loadRequest(Uri.parse('https://google.com'));
          });
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}                                                                                                                                                                                                    
```

From testing, the `WebViewWidget` would continue showing the original `WebViewController` and eventually freeze the PlatformView preventing button presses. 

This is because the PlatformView widget only creates the native PlatformView once and doesn't recreate it when the creation parameters change (as expected). This adds a default `key` to the `PlatformWebViewWidget` that is used to indicate when the underlying widget needs to be removed and recreated. See https://api.flutter.dev/flutter/widgets/Widget/key.html