Method cleanupNodeModels

frontend/layout/lib/layoutModel.ts:1104–1111

* Remove orphaned node models when their corresponding leaf is deleted. * @param leafOrder The new leaf order array to use when locating orphaned nodes.

(leafOrder: LeafOrderEntry[])

     * @param leafOrder The new leaf order array to use when locating orphaned nodes.
     */
    private cleanupNodeModels(leafOrder: LeafOrderEntry[]) {
        const orphanedNodeModels = [...this.nodeModels.keys()].filter(
            (id) => !leafOrder.find((leafEntry) => leafEntry.nodeid == id)
        );
        for (const id of orphanedNodeModels) {
            this.nodeModels.delete(id);
        }
    }

    /**
     * Switch focus to the next node in the given direction in the layout.