Fixed nprogress nesting

public_html/js/Presenters/ProgressPresenter.js

@@ -0,0 +1,31 @@
+var App = App || {};
+App.Controls = App.Controls || {};
+
+App.Presenters.ProgressPresenter = function(nprogress) {
+	var nesting = 0;
+
+	function start() {
+		nesting ++;
+
+		if (nesting === 1) {
+			nprogress.start();
+		}
+	}
+
+	function done() {
+		nesting --;
+
+		if (nesting === 0) {
+			nprogress.done();
+		} else {
+			nprogress.inc();
+		}
+	}
+
+	return {
+		start: start,
+		done: done,
+	};
+}
+
+App.DI.registerSingleton('progress', ['nprogress'], App.Presenters.ProgressPresenter);