gtk/widget.go
func (v *Widget) SetAllocation(allocation *Allocation) {
	C.gtk_widget_set_allocation(v.native(), allocation.native())
}
func (v *Widget) SetAllocation(allocation *Allocation) {
	C.gtk_widget_set_allocation(v.native(), allocation.native())
}
// SetAllocation is a wrapper around gtk_widget_set_allocation().