title: Scroll doesn't work with ScrollView and absolute positioned component
body: <p>I have a scrollView and a component with absolute position. The scrollView doesn't scroll at all. Have a look at the code: <a href="https://snack.expo.io/@codebyte99/overlap-test" rel="nofollow noreferrer">https://snack.expo.io/@codebyte99/overlap-test</a></p>
  
  <pre><code>&lt;ScrollView contentContainerStyle={{ flex: 1 }}&gt;
      &lt;View style={styles.container}&gt;
          &lt;Image
              source={{
                uri: 'https://facebook.github.io/react/logo-og.png',
                cache: 'only-if-cached',
              }}
              style={{width: 400, height: 100}}
            /&gt;
  
          &lt;View style={styles.overlap}&gt;
              &lt;Text&gt;Event1&lt;/Text&gt;
              &lt;Text&gt;Event2&lt;/Text&gt;
              &lt;Text&gt;Event3&lt;/Text&gt;
              &lt;Text&gt;Event4&lt;/Text&gt;
              &lt;Text&gt;Event5&lt;/Text&gt;
              &lt;Text&gt;Event6&lt;/Text&gt;
              &lt;Text&gt;Event7&lt;/Text&gt;
  
              &lt;View style={{ backgroundColor: 'orange', height: 800, width: 500 }}/&gt;
              &lt;View style={{ backgroundColor: 'green', height: 800, width: 500 }}/&gt;
          &lt;/View&gt;
      &lt;/View&gt;
  &lt;/ScrollView&gt;
  
  
  const styles = StyleSheet.create({
    container: {
      flex: 1,
      alignItems: 'center',
      paddingTop: Constants.statusBarHeight,
      backgroundColor: '#ecf0f1',
      padding: 8,
    },
    overlap: {
      width: 300, 
      backgroundColor: 'red', 
      borderColor: 'red', 
      borderWidth: 1,
      position: 'absolute',
      top: 80,
      zIndex: 9999,
      overflow: 'visible'
    },
  });
  </code></pre>
  
  <p>If the flex is not used in scrollView, the absolute positioned component are not visible completely and if it is used, the scroll doesn't work.</p>
  
  <p><a href="https://i.stack.imgur.com/2YBGw.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2YBGw.jpg" alt="enter image description here"></a></p>