Before changing status check if newer revision exists #7
Description
It is currently possible to approve or publish a revision other than the one being viewed. For example: two users view a page at the same time. One of them edits the page and so creates a new revision. The other approves the page without making changes. But the status is always updated on the latest revision - in this case the newer one with edited content which the approver has not seen.
To avoid this a check should be performed before changing status. If there is a newer revision than the one being currently viewed, the action should be prevented and a message shown to the user (something like "You cannot approve/publish this revision because a newer version exists + link").