RFR: 8285700: [TreeTableView] graphic property of TreeItem is still visible after collapsing tree [v3]

[Andy Goryachev]

On Mon, 17 Jul 2023 07:06:43 GMT, Karthik P K <kpk at openjdk.org> wrote:

>> In `TreeTableRowSkin`, graphic was not updated along with tree item update.
>> 
>> Made changes to update graphics of TreeTableView row in `updateTreeItem()` method.
>> 
>> Added options in monkey tester to add graphics and subnodes to `TreeTableView` rows.
>
> Karthik P K has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comments

looks good, re-approving the latest changes.

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Marked as reviewed by angorya (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1172#pullrequestreview-1533075921