title: Flutter Widget to show a nested tree structure?
body: <p>We have an N level (max is probably around 10 or so) nested data structure that basically resembles a folder layout .. </p>
  
  <p>Each node at any level is a Mime type of something to show or a URL .. </p>
  
  <p>My question is actually very simple .. is there any available Fluter Widget that can show this type of stucture -- allowing the common "open/close" at any parent level, etc.  ?? </p>
  
  <p>This seems like a pretty fundamental UI element not be had in the stock toolbox but I haven't had any luck finding one .. </p>
  
  <p>TIA!</p>
  
  <p>/Steve</p>