This was saved so that doing something which called relayout
but only changed the area rectangle would simply be needed to
recompute window scaling parameters. With the new overview
relayout, the flow control changed, it turns out that the
current layout is always cleared. Remove this for now, and we'll
put in a different strategy for this.
https://bugzilla.gnome.org/show_bug.cgi?id=694469
e981cae27c