Do not change function and class names when minifying JS (#10223)

src/Umbraco.Web.UI.Client/gulp/tasks/js.js

@@ -19,12 +19,17 @@ function js() {
     var stream = new MergeStream();
 
     var task = gulp.src(config.sources.globs.js);
+    // NOTE: if you change something here, you probably also need to change it in the processJs util
     if (config.compile.current.minify === true) {
       task = task.pipe(
         minify({
           noSource: true,
           ext: { min: '.min.js' },
-          mangle: false
+          mangle: false,
+          compress: {
+            keep_classnames: true,
+            keep_fnames: true
+          }
         })
       );
     } else {

src/Umbraco.Web.UI.Client/gulp/util/processJs.js

@@ -36,12 +36,17 @@ module.exports = function (files, out) {
     
     task = task.pipe(concat(out)).pipe(wrap('(function(){\n%= body %\n})();'))
 
+    // NOTE: if you change something here, you probably also need to change it in the js task
     if (config.compile.current.minify === true) {
       task = task.pipe(
         minify({
           noSource:true,
           ext: {min:'.min.js'},
-          mangle: false
+          mangle: false,
+          compress: {
+            keep_classnames: true,
+            keep_fnames: true
+          }
         })
       );
     } else {