Comment 37 for bug 1551283

GNOME Flashback currently uses unity-control-center and unity-settings-daemon, so the input handling is exactly like in Unity (gnome-flashback's own input methods code is disabled).

When we switch XDG_CURRENT_DESKTOP from Unity to GNOME, at the same time we'll start using our own code and gnome-control-center. I was basically waiting for upstream to implement a StatusNotifier based tray because I don't want to reintroduce the XEmbed tray. Hope it will happen next cycle.

So if there is Unity in XDG_CURRENT_DESKTOP, one may expect that the code behaves just like Unity (at least from input methods point of view).