title: CollapsingToolbarLayout doesn't recognize scroll fling
body: <p>I have created a simple <strong>CollapsingToolbarLayout</strong> and it works like a charm. My problem is, that if I try to use a fling scroll on the <strong>nestedscrollview</strong>, it just stops when I release my finger. Normal scrolling works like it should.</p>
  
  <p>My activities code is <strong><em>unchanged => auto</em></strong> generated empty activity. (I just clicked on create new empty activity in android studio and edited the XML yet).</p>
  
  <p>I read here, that scroll gestures on the imageview itself are buggy, but not, that the scrolling itself is buggy: <a href="https://code.google.com/p/android/issues/detail?id=176673">see here</a>.</p>
  
  <p>I tried activating <strong><em>"smooth scrolling"</em></strong> through java code. It seems like if I scroll far enough that the imageview isn't visible anymore, fling gestures then are recognized. </p>
  
  <p><strong>TLDR:</strong> Why does the fling gesture not work as long as the imageview is visible ?
  My XML Code looks like this:</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"
      android:fitsSystemWindows="true"&gt;
  
      &lt;android.support.design.widget.AppBarLayout
          android:id="@+id/profile_app_bar_layout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
          android:fitsSystemWindows="true"&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout
              android:id="@+id/profile_collapsing_toolbar_layout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              app:layout_scrollFlags="scroll|exitUntilCollapsed"
              app:contentScrim="?attr/colorPrimary"
              app:expandedTitleMarginStart="48dp"
              app:expandedTitleMarginEnd="64dp"
              android:fitsSystemWindows="true"&gt;
  
              &lt;ImageView
                  android:id="@+id/image"
                  android:layout_width="match_parent"
                  android:layout_height="420dp"
                  android:scaleType="centerCrop"
                  android:fitsSystemWindows="true"
                  android:src="@drawable/headerbg"
                  android:maxHeight="192dp"
  
                  app:layout_collapseMode="parallax"/&gt;
  
              &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                  app:layout_collapseMode="pin" /&gt;
  
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
      &lt;android.support.design.widget.FloatingActionButton
          android:id="@+id/fab"
          app:layout_anchor="@id/profile_app_bar_layout"
          app:layout_anchorGravity="bottom|right|end"
          android:layout_height="@dimen/fab_size_normal"
          android:layout_width="@dimen/fab_size_normal"
          app:elevation="2dp"
          app:pressedTranslationZ="12dp"
          android:layout_marginRight="8dp"
          android:layout_marginEnd="8dp"/&gt;
  
      &lt;android.support.v4.widget.NestedScrollView
          android:id="@+id/profile_content_scroll"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:clipToPadding="false"
          app:layout_behavior="@string/appbar_scrolling_view_behavior"
          android:layout_gravity="fill_vertical"
          android:minHeight="192dp"
          android:overScrollMode="ifContentScrolls"
          &gt;
  
          &lt;RelativeLayout
              android:layout_width="match_parent"
              android:layout_height="wrap_content"&gt;
  
              &lt;TextView
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:text="@string/LoremIpsum"/&gt;
  
          &lt;/RelativeLayout&gt;
  
      &lt;/android.support.v4.widget.NestedScrollView&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>