title: TableView separator disappear
body: <p>When I select rows from top to bottom, separator appears. However when I scroll the rows, the separator removed.</p>
  
  <p>When I select rows from bottom to top, separator doesn't appear.</p>
  
  <p>How can I keep the separator always existed?</p>
  
  <p>I have searched for a while and seems there is no solution yet.</p>