bug(TreeControl): TreeControl's trackBy is unusable

[alvipeo]

Here's the code to create FlatTreeControl:

    this.treeControl = new FlatTreeControl<GeoEntityFlatNode>(
      (node) => node.nodeLevel,
      (node) => node.expandable,
      { trackBy: this.trackByGroupPath } // ========> DOES NOT COMPILE
    );

and the trackByGroupPath:

  trackByGroupPath(index: number, node: GeoEntityFlatNode): string {
    return node.groupPath;
  }

And this whole thing does not compile as

Type '(node: GeoEntityFlatNode) => string' is not assignable to type '(dataNode: GeoEntityFlatNode) => GeoEntityFlatNode'.

Am I missing something or this makes trackBy completely useless?

[crisbeto]

Looks like this is the same issue as #21364 which should be fixed by #21421.

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