Method collapse

packages/sanddance/src/dataScope.ts:117–122

(collapsed: boolean, data = this.data)

    }

    public collapse(collapsed: boolean, data = this.data) {
        data.forEach(datum => {
            datum[FieldNames.Collapsed] = collapsed;
        });
        this.isCollapsed = collapsed;
    }

    public activate(datum: object) {
        this.deactivate();