title: React-Joyride 'Target not visible' message when stopping mid-tutorial
body: <p>I'm using react-joyride for a user-tutorial.
  One of the targets is a menu-entry in a dropdown menu which is closed initially (so target is not visible).
  In the joyride callback, I detect when it's time to show the dropdown and manipulate the css to make the element visible. It all works fine if I click Next until the end.</p>
  
  <p>If, however, I close the tutorial in the middle, right before that step, I get a warning 'Target not visible'. This is because it already loads the next step (even though I fire the 'stop' action).</p>
  
  <p>Is there a way to avoid this? Or is it intentional that you can only focus on elements that are at all times visible on the page?</p>
  
  <p>Thanks for any input.</p>