fix(start): do not add extra history item when choosing start page

app/scripts/lib/app-start.js

@@ -571,7 +571,11 @@ Start.prototype = {
     // pushState must be specified or else no screen transitions occur.
     this._history.start({ pushState: this._canUseHistoryAPI(), silent: isSilent });
     if (startPage) {
-      this._router.navigate(startPage);
+      this._router.navigate(startPage, {}, {
+        // do not add a history item for the page that was there BEFORE the selected start page.
+        replace: true,
+        trigger: true
+      });
     }
   },
 

app/tests/spec/lib/app-start.js

@@ -162,10 +162,10 @@ define(function (require, exports, module) {
           sandbox.restore();
         });
 
-        it('redirects to /cookies_disabled', () => {
+        it('redirects to /cookies_disabled without history replace or trigger', () => {
           return appStart.startApp()
             .then(() => {
-              assert.isTrue(routerMock.navigate.calledWith('cookies_disabled'));
+              assert.isTrue(routerMock.navigate.calledWith('cookies_disabled', {}, {replace: true, trigger: true}));
             });
         });