fix: Workaround Android 12 webview crash (#42517)

* fix: Workaround Android 12 webview crash

A crash occurred due to combining webviews with Android 12's new scroll
overflow behavior. Applying `opacity: 0.99` prevents the crash from
occurring. This change should be viewed as a temporary fix while we
await a more appropriate solution for the `react-native-webview`
library.

react-native-webview/react-native-webview#1915 (comment)

* docs: Add change log entry

packages/components/src/sandbox/index.native.js

@@ -1,13 +1,14 @@
 /**
  * External dependencies
  */
-import { Dimensions, Platform } from 'react-native';
+import { Dimensions, StyleSheet } from 'react-native';
 import { WebView } from 'react-native-webview';
 
 /**
  * WordPress dependencies
  */
 import {
+	Platform,
 	renderToString,
 	memo,
 	useRef,
@@ -307,6 +308,7 @@ function Sandbox( {
 			style={ [
 				sandboxStyles[ 'sandbox-webview__content' ],
 				getSizeStyle(),
+				Platform.isAndroid && workaroundStyles.webView,
 			] }
 			onMessage={ checkMessageForResize }
 			scrollEnabled={ false }
@@ -317,4 +319,15 @@ function Sandbox( {
 	);
 }
 
+const workaroundStyles = StyleSheet.create( {
+	webView: {
+		/**
+		 * The slight opacity below is a workaround for an Android crash caused from combining Android
+		 * 12's new scroll overflow behavior and webviews.
+		 * https://github.com/react-native-webview/react-native-webview/issues/1915#issuecomment-808869253
+		 */
+		opacity: 0.99,
+	},
+} );
+
 export default memo( Sandbox );

packages/react-native-editor/CHANGELOG.md

@@ -13,6 +13,7 @@ For each user feature we should also add a importance categorization label  to i
 
 -   [*] Add React Native FastImage [#42009]
 -   [*] Block inserter displays block collections [#42405]
+-   [**] Fix a crash when scrolling posts containing Embed blocks (Android 12 only) [#42514]
 
 ## 1.79.0
 -   [*] Add 'Insert from URL' option to Video block [#41493]