365cda386c
Commit d0310bd745968 blindly replaced global.overlay_group with Main.layout.overviewGroup, but unlike the former, the latter is hidden while the overview is not active, which makes it unsuitable for the message tray's light box. In fact, with the removal of global.overlay_group, there is no longer a container which may be used both inside and outside the overview, so we can either recreate the lightbox each time we show/hide the overview, or use different lightboxes altogether; this opts for the latter. https://bugzilla.gnome.org/show_bug.cgi?id=701097
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