Perhaps once you bring up the windows in the overlay, there
could be a filtering function. For instance, you have many windows up
- quite a few of which are evnice. You wish to see only the evince
windows, so you go into overlay and it shows all windows (with the app
logo in the bottom right of each window). To only show windows of
evince you could click on one of the evince window logo's and that will
then only show evince windows in that overlay. I think that would be a
quick and easy way to filter windows and would not get in they way of
the casual user as the logos in the bottom right of the application is
a rather finer target than the whole window thumbnail as presented in
the overlay.
