CallWindow: highlight drop zones when hovered
CallWindow: highlight drop zones when hovered

https://bugzilla.gnome.org/show_bug.cgi?id=656268

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets