title: react window with Autosizer
body: <p>I got a problem when I used react-window with react-virtualized-auto-sizer, I made a little change of official example, then the list is disappear. I wonder why?
  Thank you for any help ~~</p>
  <p>sandbox: <a href="https://codesandbox.io/s/bvaughn-react-window-fixed-size-list-vertical-forked-utczn?file=/index.js" rel="nofollow noreferrer">https://codesandbox.io/s/bvaughn-react-window-fixed-size-list-vertical-forked-utczn?file=/index.js</a></p>
  <p>when you delete the <code>div</code> node in the <code>Example</code>component, everything is ok.</p>