RFR: 8165214: ListView.EditEvent.getIndex() does not return the correct index [v2]

[Ajit Ghaisas]

On Mon, 21 Jun 2021 13:22:07 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

>> Issue was that the cancel event carried the listView's editingIndex at the time of firing the event - that's wrong nearly always (because the list's editing state/index might have changed between start and cancel, f.i. due to calling list.edit(someDifferentIndex)). 
>> 
>> Fixed by keeping the index at startEdit and using that in cancelEdit (similar approach as in TreeCell fix [TreeCell fix JDK-8265210](https://bugs.openjdk.java.net/browse/JDK-8265210). 
>> 
>> Added tests that are failing (and one that was accidentally passing) before, all passing after.
>
> Jeanette Winzenburg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   changed scope of field indexAtStartEdit to private

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/539