title: Spyder - Shortcut to go to previous file I was editing?
body: <p>Is there a navigation shortcut to go to the file I was previously editing?</p>
  
  <p>Case:</p>
  
  <p>say I am switching between <code>a.py</code> and <code>z.py</code>, and there are a number of other files in between.</p>
  
  <p>I can do <code>ctrl+pagedown</code> and scroll all the way, but is there a way to switch quickly between the two files?</p>