Added missing functions for setting and getting completion
Added missing functions for setting and getting completion

Susurrus/gtk,daa84/gtk,LordSentox/gtk,gkoz/gtk-rs-gtk,gkoz/rust-gnome-gtk,LordSentox/gtk,gkoz/rust-gnome-gtk,EPashkin/rust-gnome-gtk,rust-gnome/gtk,Susurrus/gtk,rust-gnome/gtk,EPashkin/rust-gnome-gtk,insanebits/gtk,insanebits/gtk,daa84/gtk,gkoz/gtk-rs-gtk