Method delete

frontend/layout/lib/nodeRefMap.ts:13–18

(id: string)

    }

    delete(id: string) {
        if (this.map.has(id)) {
            this.map.delete(id);
            this.generation++;
        }
    }

    get(id: string): React.RefObject<HTMLDivElement> {
        if (this.map.has(id)) {