Merge branch 'winh-karma-sourcemaps' into 'master'

Use inline source maps for karma

Closes #30996

See merge request !11815

config/karma.config.js

@@ -13,6 +13,8 @@ if (webpackConfig.plugins) {
   });
 }
 
+webpackConfig.devtool = 'cheap-inline-source-map';
+
 // Karma configuration
 module.exports = function(config) {
   var progressReporter = process.env.CI ? 'mocha' : 'progress';

config/webpack.config.js

@@ -74,8 +74,6 @@ var config = {
     chunkFilename: IS_PRODUCTION ? '[name].[chunkhash].chunk.js' : '[name].chunk.js',
   },
 
-  devtool: 'cheap-module-source-map',
-
   module: {
     rules: [
       {