Fix navigation controller

In-page navigation has not actually started if the current entry is
being replaced. Do not set inPageIndex if replaceEntry is true.

lib/browser/api/navigation-controller.js

@@ -33,7 +33,7 @@ var NavigationController = (function () {
       if (this.inPageIndex > -1 && !inPage) {
         // Navigated to a new page, clear in-page mark.
         this.inPageIndex = -1
-      } else if (this.inPageIndex === -1 && inPage) {
+      } else if (this.inPageIndex === -1 && inPage && !replaceEntry) {
         // Started in-page navigations.
         this.inPageIndex = this.currentIndex
       }