Actually it already exists within LW. But not everybody realises it. lol
If you hit the small arrows on the main interface, it will show only the one window. Choose the up-down arrows. The up arrow will only show the downlds window. If you click the down arrow it will extend the search results window down & just show the search results window. See the arrows at the bottom of the image example
HERE for showing isolated partitions only (click on link) eg: If you want to extend the search results then you'd click the down arrow. To show both again you'd click the up arrow which will then be at bottom of window. It would mean a 3 click scenario in-between showing both results & downlds full windows however.