gtk/gtk_since_3_12.go
func (fb *FlowBox) SetColumnSpacing(spacing uint) {
	C.gtk_flow_box_set_column_spacing(fb.native(), C.guint(spacing))
}
func (fb *FlowBox) SetColumnSpacing(spacing uint) {
	C.gtk_flow_box_set_column_spacing(fb.native(), C.guint(spacing))
}
// SetColumnSpacing is a wrapper around gtk_flow_box_set_column_spacing()