When we had a filtered set of windows, and want to exit the overview
into a particular window, what we do is re-show all the old windows
first, but don't reset the scaling on them. This will involve
some overlapping, but that's not a big deal because we'll immediately
get overlap anyways in the normal case zooming the windows back.
https://bugzilla.gnome.org/show_bug.cgi?id=594699