title: How to prevent clickevent on Screen when actor is touched ? (LIBGDX)
body: <p>I have a :</p>
  
  <ul>
  <li>Screen implementing InputProcessor</li>
  <li>A stage created in the screen.</li>
  <li>an Actor added to the stage</li>
  <li>the Actor has a InputListener with a touchUp method, which is called when the actor is touched.</li>
  <li>When clicking on the actor the method touchUp of the actors inputlistener is called and the touchUp from the InputProcessor is also called.</li>
  </ul>
  
  <p>Question:
  How can I prevent calling the touchup method from the screen ? My goal is only to handle the event from actor. I would like to only react on the touch from the actor and not also from the screen.</p>