title: Latest PHPStorm version. Have multiple projects in one window
body: <p>Currently we are on the PHPStorm version 9.0.2. </p>
  
  <p>I know it was not possible to have multiple projects in the same window (which seems weird to me as it has a 'Project' panel where you can toggle your project. This toggle functionality does not make much sense if you are only allowed to have only one project).</p>
  
  <p>Do you know if it is possible to have multiple projects in one window?</p>