Editor: use the `post_edit_form_tag` action to add autocomplete="off" to the whole form on the Add/Edit Post screen in WebKit. Prevents editor problems when the browser's Back button is used. Fixes #28037.
Built from https://develop.svn.wordpress.org/trunk@29448


git-svn-id: http://core.svn.wordpress.org/trunk@29226 1a063a9b-81f0-0310-95a4-ce76da25c4cd