title: How to prevent auto scroll down on tab2 when user scroll down on tab1 in flutter?
body: <p>I created a screen using <code>SliverAppBar</code>, <code>SliverPersistentHeader</code>, <code>TabView</code> and <code>ListView</code>.</p>
  
  <p>If I scroll down in tab1, tab2 scrolling down automatically. So If I swith  to tab2, list not starting from first item.  How can I prevent this?</p>
  
  <p>I created simple demo app for demonstrate the issue, you can look at this <a href="https://gist.github.com/mesuutt/5d892bf0b5f3f0bbf36e19bda2d1a49d" rel="nofollow noreferrer">gist</a>.</p>
  
  <p>Initial state of the screen:
  <a href="https://i.stack.imgur.com/WNWVX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WNWVX.jpg" alt="1"></a></p>
  
  <p>If I scroll tab1 shown as below:
  <a href="https://i.stack.imgur.com/Ggbzq.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ggbzq.jpg" alt="2"></a></p>
  
  <p>Tab2 scrolling down automatically shown as below when I scroll tab1:
  <a href="https://i.stack.imgur.com/xahO6.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xahO6.jpg" alt="3"></a></p>