title: How to add click action for the ImageSpan
body: <p>I have a ImageSpan set in the TextEdit. And I want to add the action - when user click on the ImageSpan, it will popup a dialog and show the big image.</p>
  
  <p>I checked the SDK and seems the ImageSpan doesn't support onclick. Is there anyway to enable the onclick for the ImageSpan or other Span that support Image? </p>
  
  <p>I checked the code and found there is a URLSpan created with the ImageSpan because the input string is </p>
  
  <p>But seems the URLSpan doesn't work and there is no click action create for it. Any idea?</p>
  
  <p>Thanks.</p>