message: Replaced fragment instead of adding
diff: @@ -132,8 +132,7 @@ public class NavigationStackView extends ViewGroup {
  FragmentManager fragmentManager = ((FragmentActivity) mainActivity).getSupportFragmentManager();
  FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
  fragmentTransaction.setCustomAnimations(enter, exit, popEnter, popExit);
  - fragmentTransaction.remove(fragmentManager.findFragmentByTag(oldKey));
  - fragmentTransaction.add(((ViewGroup) this.getParent()).getId(), new SceneFragment(scene), key);
  + fragmentTransaction.replace(((ViewGroup) this.getParent()).getId(), new SceneFragment(scene), key);
  fragmentTransaction.addToBackStack(String.valueOf(crumb));
  fragmentTransaction.commit();
  }
  