title: Scrollview does not work outside LinearLayout with Viewpager
body: <p>My layout file:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;ScrollView 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:fillViewport="true"&gt;
  
      &lt;LinearLayout
          android:id="@+id/root_layout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="vertical"
          &gt;
  
  
          &lt;ImageView
              android:id="@+id/imageViewPage"
              android:layout_width="match_parent"
              android:layout_height="200dp"
              android:src="@drawable/zelenjavne_jedi"/&gt;
  
  
          &lt;android.support.v4.view.ViewPager
              android:id="@+id/viewpager"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"&gt;
  
              &lt;android.support.design.widget.TabLayout
                  android:id="@+id/sliding_tabs"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"/&gt;
  
          &lt;/android.support.v4.view.ViewPager&gt;
  
      &lt;/LinearLayout&gt;
  
  &lt;/ScrollView&gt;
  </code></pre>
  
  <p>No matter how I change height to fill_parents, wrap_content, match_parent etc, if I use other views such as Relative instead of Linear it still doesn't work.</p>