title: Visual Studio Hangs when closing .SQL files
body: <p>I have all extensions disabled, and only 1 Sql Project open. Yet Visual Studio hangs whenever I close a SQL file.</p>
  
  <blockquote>
    <p>Versions affected:</p>
    
    <ul>
    <li>2017 Enterprise </li>
    <li>2015 Enterprise</li>
    </ul>
  </blockquote>
  
  <p>During this "hang time" Visual Studio possesses a Not Responding status.</p>
  
  <p>It also appears that the amount of time it stays locked is correlated to the number of files being closed/are open.</p>
  
  <blockquote>
    <p>EDIT: Reproducable with devenv in SafeMode</p>
  </blockquote>
  
  <p>Thoughts?</p>