RFR: JDK-8187314: All Cells: must show backing data always

[Andy Goryachev]

On Fri, 4 Aug 2023 18:13:34 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> Before, the `updateItem` method was called with the new value that was committed via `commitEdit()`.
> This is problematic as developers may setup a commit handler via `setOnEditCommit`, which may reject the edit (or change the value otherwise).
> We therefore do call the `updateItem(-1)` which will also call `updateItem` but with the real underlying value.
> 
> Changed and added tests for all 4 cells.

I've tested this change with ListView, TableView, and TreeView.
Do you have a SCCE for TreeTableView similar to the TreeView example in the ticket?

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PR Comment: https://git.openjdk.org/jfx/pull/1197#issuecomment-1679710737