title: Keyboard shortcut to toggle between previous file and current file in editor
body: <p>I usually use <kbd>ctrl</kbd>+<kbd>tab</kbd> to toggle between last viewed tab or file and current one in other editors like VS or Netbeans or even on browsers. But with xcode I cannot find a keyboard combo for that. I have googled with no avail.</p>
  
  <p>Can anyone please help with this?</p>