"View post" link should not change when sample permalink changes

[solarissmoke]

To reproduce:

• Go to edit a post
• Change the permalink
• Click on "View post" and you get a 404 because the href has been changed to the new sample permalink but the post hasn't been updated yet

The "View post" link should always point to the permalink of the currently saved post.

I think there may be some usability improvements that could be made here - see #6925.

For example custom fields are updated via AJAX without having to save the whole post. But permalinks aren't. Maybe we ought to be more consistent.

I imagine this isn't a regression, so moving off the 3.1 version.

Agreed that a) View Post should go to current saved, and b) we should do an inventory of ajax vs on-save stuff and try to get things more consistent.