31914ab23b
Previously we used a ClutterGroup containing a second ClutterGroup for the non-visibleInOverview actors. Redo it using a single ShellGenericContainer, and use set_skip_paint() to hide the non-overview chrome when the overview is visible. Also fix up the default values for trackActor(). https://bugzilla.gnome.org/show_bug.cgi?id=608667