Build simple-browser media during watch

Fixes #119795

This lets us avoid having these files checked in

extensions/simple-browser/webpack.config.js

@@ -3,12 +3,14 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 const path = require('path');
+const CopyPlugin = require('copy-webpack-plugin');
 
 module.exports = {
+	context: path.resolve(__dirname),
 	entry: {
 		index: './preview-src/index.ts',
 	},
-	devtool: 'source-map',
+	mode: 'production',
 	module: {
 		rules: [
 			{
@@ -24,5 +26,20 @@ module.exports = {
 	output: {
 		filename: '[name].js',
 		path: path.resolve(__dirname, 'media')
-	}
+	},
+	plugins: [
+		// @ts-ignore
+		new CopyPlugin({
+			patterns: [
+				{
+					from: './node_modules/vscode-codicons/dist/codicon.css',
+					to: 'codicon.css'
+				},
+				{
+					from: './node_modules/vscode-codicons/dist/codicon.ttf',
+					to: 'codicon.ttf'
+				},
+			],
+		}),
+	]
 };