When creating a post or private message, an option would be helpful to resort to the previous version of the post / private message.
Specifics:
After typing a message and adding some of the different text enhancing options, I like to preview the message to see if it looks good, usually it is fine and I go ahead in submitting it or continue about my message. Sometimes though, I would add in these different features and it does not look good or is hard to read so this means I have to go back to the message and take it all out. I am suggesting an option that would save the trouble of taking out all of the text enhancements options one by one. It would be helpful if you could choose to resort to the previous version of the post / private message in a simple click of a button.
The option can be alongside the "Save", "Preview" and "Submit" choices.
This will improve the following aspects of the site: