Redmine

After editing an issue/wiki page/whatever it sometimes happens that you press the BACK button (or something else) on the browser that makes your changes to vanish.

To me, this usually happens when I'm editing a post. I click on preview to see how the post would look like, I notice something wrong and I want to go back to correct it. This is when I do the mistake. I click on "back" instead of going up in the page. And I cry.

Originally I thought it was just me, but then I realized it was a common pattern among redmine users.

It would be extremely trivial to implement and a lot helpful. See Gmail and Wordpress as examples.