Enable pointer lock in iframe based webviews

#104169

src/vs/workbench/contrib/webview/browser/webviewElement.ts

@@ -70,7 +70,7 @@ export class IFrameWebview extends BaseWebview<HTMLIFrameElement> implements Web
 		// Wait the end of the ctor when all listeners have been hooked up.
 		const element = document.createElement('iframe');
 		element.className = `webview ${options.customClasses || ''}`;
-		element.sandbox.add('allow-scripts', 'allow-same-origin', 'allow-forms');
+		element.sandbox.add('allow-scripts', 'allow-same-origin', 'allow-forms', 'allow-pointer-lock');
 		element.style.border = 'none';
 		element.style.width = '100%';
 		element.style.height = '100%';