In that section, it mostly compares itself to Microsoft Windows' stacking (not tiling) window manager. There's no comparison to ANY of the already existing tiling window managers.
It was filed on June 2nd, 2008.
There were a ton of tiling oriented windows managers in place for many, many, years prior. Many of them supported automatic layout, and many supported a variety of grid layouts as depicted in the patent.
Here's a video from 1987, 21 years prior to the filing of this patent, showing the Siemens RTL tiling window manager: https://www.youtube.com/watch?v=MFd0FDv3fQc You can see the selected layout in the upper left hand corner of the screen. The video itself shows the user choosing where new windows will land, and the automated tiling/fit.
As mentioned earlier, a ton of other tiling window managers existed well before the filing of this patent. Many of them with automatic tiling, and several grid layout options. I don't see anything in the patent that sounds novel to me.