Hitting backspace on the Create Issue dialog loses any form data

Steps to reproduce with Chrome:

1. Navigate around a bit so that you'r browser tab has some history
2. Click the create issue link on top of the page
3. Write something in description field
4. Click the white space immediately to the left of the description field (so that the field loses focus)
5. Hit backspace
6. The browser should load the previous page you visited and you'll lose whatever you wrote in to the description field

h3, Actual Results

Browser navigates back and the dialog and its contents are lost.

Expected Results

A confirmation message is displayed to prevent the user from losing the data in the form.

Notes

This does not work if the browser tab does not have any history to go back to