Possible to make it so a draft of message is autosaved?

Twice now recently (and many times in the past: yes, you'd think I'd've learned my lesson by now), I've lost my draft post b/c, after switching from Quick Reply to Advanced, I accidentally hit the delete key on my keyboard, and for some reason, this clears the entire message window, and if there's a way to get back what I've written so far, I haven't been able to find it. Yes, I know I should, consequently, draft my messages elsewhere, and then copy-paste them into the message window, but obviously I appear incapable of learning that lesson: is there some way to make the Message text-field "dummy-proof"?

Thanks for your consideration!