title: CoordinatorLayout with NestedScrollView and Horizontal Scrolling RecyclerView
body: <p>I have a CoordinatorLayout with an AppBarLayout to collapse/expand the Toolbar on scroll. The content view is a NestedScrollView with RecyclerViews (which scroll horizontally) and some other views without scrollviews. Pretty similar to the Airbnb app.</p>
  
  <pre><code>&lt;android.support.design.widget.CoordinatorLayout
      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;android.support.design.widget.AppBarLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
          &lt;include layout="@layout/toolbar_flat" /&gt;
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
      &lt;android.support.v4.widget.NestedScrollView
              android:id="@+id/newstedScrollView"
             app:layout_behavior="@string/appbar_scrolling_view_behavior"
              android:layout_width="match_parent"
              android:layout_height="match_parent"&gt;
                  &lt;LinearLayout
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:background="@color/consistentGreyWhite"
                      android:paddingBottom="@dimen/activity_vertical_margin"
                      android:clipToPadding="false"
                      android:orientation="vertical"&gt;
  
                      &lt;android.support.v7.widget.RecyclerView
                          android:id="@+id/home_slider"
                          android:layout_width="match_parent"
                          android:layout_height="wrap_content"
                          android:background="@color/consistentWhite"
                          android:clipToPadding="false"
                          android:paddingBottom="@dimen/activity_vertical_margin"
                          android:paddingLeft="14dp"
                          android:paddingRight="14dp"
                          android:paddingTop="@dimen/activity_vertical_margin"
                          /&gt;
  
                      &lt;... other elements ...&gt;
  
              &lt;/LinearLayout&gt;
      &lt;/android.support.v4.widget.NestedScrollView&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p>If I scroll on an element without scrollviews the toolbar collapse/expand works. But if I perform a scroll (vertical) on a RecyclerView the toolbar doesn't work as expected. Seems like the RecyclerViews don't pass the scroll events to the CoordinatorLayout.</p>