Method _updateKeyManagerItems

src/cdk/tree/tree.ts:1121–1123

(flattenedNodes: readonly T[])

  }

  private _updateKeyManagerItems(flattenedNodes: readonly T[]) {
    this._keyManagerNodes.next(flattenedNodes);
  }

  /** Traverse the flattened node data and compute parents, levels, and group data. */
  private _calculateParents(flattenedNodes: readonly T[]): void {