title: How to swap deployment slots for web apps with virtual applications
body: <p>I have an existing web app with one virtual application.
  Later I added a deployment slot for staging.
  The deployment slot was created cloning the main web app.
  When I swapped the production slot for the staging slot the virtual application was gone.
  Am I missing a checkbox or setting?
  Is there a solution or workaround for that?
  Well, apart from creating separate web apps for each virtual application.</p>
  
  <p><img src="https://i.stack.imgur.com/WeIYH.png" alt="enter image description here"></p>