Which version are you raising this against. Main trunk GTK2? Unlikely to be fixed. GTK3 port? If so, then it is worth investigating, although I'm 99% certain that this would then be against the libvte project, not Terminator. Have you tested this against an up-to-date gnome-terminal? If it works there it will probably work in the GTK3 version of Terminator.
Which version are you raising this against. Main trunk GTK2? Unlikely to be fixed. GTK3 port? If so, then it is worth investigating, although I'm 99% certain that this would then be against the libvte project, not Terminator. Have you tested this against an up-to-date gnome-terminal? If it works there it will probably work in the GTK3 version of Terminator.