RFR: 8341281: Root TreeItem with null value breaks TreeTableView [v4]

[Ziad El Midaoui]

On Tue, 27 May 2025 16:09:52 GMT, Ziad El Midaoui <zelmidaoui at openjdk.org> wrote:

>> When the Root TreeItem is set to null, need to relayout to show the children items
>
> Ziad El Midaoui has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Minor change : new line added

@arapte Could you please review ?

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PR Comment: https://git.openjdk.org/jfx/pull/1767#issuecomment-2915950640