RFR: 8314512: IGV: clean up hierarchical layout code

[Tobias Holenstein]

On Thu, 28 Nov 2024 07:41:13 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> Drive-by comment: You could update the class comments for the four classes described above in the PR description with the actual PR descriptions which are more detailed than the current class comments found in the code.

Good idea. done

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PR Comment: https://git.openjdk.org/jdk/pull/22402#issuecomment-2507663790