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

[Karthik P K]

On Fri, 7 Jul 2023 05:25:34 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.

Added unit test as suggested above.

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PR Comment: https://git.openjdk.org/jfx/pull/1172#issuecomment-1635789658