title: In Flutter, how to add a jump index to a ListView
body: <p>In iOS there is a build-in way to have a jump index at the right side of a UITableView. </p>
  
  <p>E.g. if the table view contains contacts you would have a jump index with the letters A-Z and if the user taps "K" the table would will automatically jump to the section with all the names that starts with a "K".</p>
  
  <p>Is there something similar for Flutter ListView?</p>
  
  <p><a href="https://i.stack.imgur.com/2108r.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2108r.png" alt="Long list jump index example"></a></p>