chat-window: don't play sound for pending messages (#639302)
chat-window: don't play sound for pending messages (#639302)

They have already be notified by the Approver.

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