Allow comment_form() to display the comment field first

[johnbillion]

Many sites and many third-party comment system providers display the comment field before the name/email/URL fields in comment forms these days.

It would be nice to have any easy option to do this with the comment_form() function. Currently if you want to display the comment field first you'll have to avoid using comment_form() or you'll have to do some crazy CSS or jQuery trickery to move things around. Neither are optimal.

[johnbillion]

Patch for the comment_field() argument, and example patch showing usage in Twenty Thirteen.

[toscho]

You can ​do that with PHP already, no need for JavaScript or CSS. But yes, an easier way would be useful.

[sethshoultes]

Tested the 24064.patch and 24064.twentythirteen.patch​ patches and they seem to be working well. However, if possible, you might want to add a little more margin to the top of the "Post Comment" button in the Twenty Thirteen theme. Screenshot: ​http://www.screencast.com/t/1jxqdIIFb

[johnbillion]

Not directly a dupe, but closing in favour of #29974.