title: Plotly.js "bleeding" bar chart
body: <p>I have a stacked bar chart in Plotly.js (latest build) and upon hovering, the graph seems to leave a graphical trail:</p>
  
  <p><a href="https://i.stack.imgur.com/EKeZc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EKeZc.png" alt="Bleeding hover effect"></a></p>
  
  <p>I'm not sure how to solve this as it just uses the default hover effect ... Any help would be much appreciated, if I have left out some crucial information in order to describe the problem, I'd love to hear it as well.</p>