title: How can I "keep" the uploaded image on a form validation error?
body: <p>I have a form which has a <code>FileField</code> among other fields. Imagine the user chooses a file, presses submit and another field triggers a ValidationError. 
  When I get back the form, with the errors on the page, what the user chose for the file field is gone. Can I make it appear, or is this a browser thing?</p>