I was reading an old [Coding Horror](http://www.codinghorror.com/blog/2009/04/death-to-the-space-infidels.html) article about indentation, when I read this:

> 
> Or, maybe you're using a next-next-generation editor that treats code as "data" and the layout (including whitespace) as a "view", making all these concerns largely irrelevant.
> 
> 
> 

Exactly what next-next-generation editors was Jeff Atwood referring to?