title: Open the same directory twice
body: <p>On command line, I could open a directory like:</p>
  
  <pre><code>    code .
  </code></pre>
  
  <p>Now, I want two of the identical diretory opened and displayed in another window.<br>
  (It's not spliting the editor)<br>
  Then, I tried again.</p>
  
  <pre><code>    code .
  </code></pre>
  
  <p>Nothing happened.<br>
  There's still one directory opened.<br>
  How to achieve such a task?</p>