title: BottomNavigationView hides when scrolling up instead of down
body: <p>The new <code>BottomNavigationView</code> from support library v25.0.0 is supposed to hide when scrolling down, in order to see all the items from a list. However, in my testing scenario, the view hides when scrolling up. Any ideas what can cause this reverse behavior?</p>
  
  <p>The <code>inner_fragment</code> is set up as a Fragment inserted inside the <code>activity_main_framelayout_content</code> Framelayout. XML layouts below:</p>
  
  <p><strong>main_activity.xml:</strong></p>
  
  <p></p>
  
  <pre><code>&lt;android.support.design.widget.CoordinatorLayout
          android:id="@+id/activity_main_coordinatorlayout"
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;
  
      &lt;android.support.design.widget.AppBarLayout
              android:id="@+id/activity_main_appbarlayout"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"&gt;
  
          &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/activity_main_toolbar"
                  android:layout_height="?attr/actionBarSize"
                  android:layout_width="match_parent"
                  android:background="?attr/colorPrimary"
                  app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
                  app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                  app:layout_scrollFlags="scroll|enterAlways"&gt;
  
              &lt;include layout="@layout/activity_main_spinner_layout"/&gt;
          &lt;/android.support.v7.widget.Toolbar&gt;
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
      &lt;FrameLayout
              android:id="@+id/activity_main_framelayout_content"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              app:layout_behavior="@string/appbar_scrolling_view_behavior"
              android:fitsSystemWindows="true"/&gt;
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  
  &lt;android.support.design.widget.NavigationView
          android:id="@+id/activity_main_framelayout_navigation_drawer"
          android:layout_width="@dimen/drawer_width"
          android:layout_height="match_parent"
          android:layout_gravity="start"
          android:fitsSystemWindows="true"
          android:background="@color/color_black_700"/&gt;
  </code></pre>
  
  <p></p>
  
  <p><strong>inner_fragment.xml:</strong></p>
  
  <pre><code>&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
               xmlns:app="http://schemas.android.com/apk/res-auto"
               android:layout_width="match_parent"
               android:layout_height="match_parent"&gt;
  
      &lt;FrameLayout
              android:id="@+id/inner_fragment_framelayout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"/&gt;
  
      &lt;android.support.design.widget.BottomNavigationView
              android:id="@+id/inner_fragment_bottom_navigation_view"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_gravity="bottom"
              app:menu="@menu/inner_fragment"
              app:itemBackground="@drawable/bg_bottom_navigation"
              app:itemIconTint="@color/ic_bottom_navigation"
              app:itemTextColor="@color/ic_bottom_navigation"/&gt;
  &lt;/FrameLayout&gt;
  </code></pre>