How can I keep undo history after saving on Visual Studio Code : <p>I'm using latest version of VS code (1.9.0).</p>

<p>After I undo (ctrl+z) something, and save the file (ctrl+s), then I cannot redo anymore (ctrl+y).</p>

<p>I would like to go back and forth during the editor is running same as Sublime or other editor. Can anyone solve this problem? Thank you.</p>
