RFR: 8265210: TreeCell: cell editing state not updated on cell re-use [v2]

[Ajit Ghaisas]

On Mon, 24 May 2021 13:04:46 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

>> fix is analogous to similar issues for Tree/TableCell (combined [JDK-8150525](https://bugs.openjdk.java.net/browse/JDK-8150525) and [JDK-8265206](https://bugs.openjdk.java.net/browse/JDK-8265206))
>> 
>> added tests that failed before and passed after the fix
>> 
>> note: this PR also adds two asserts (which I forgot in the previous [PR 473](https://github.com/openjdk/jfx/pull/473);) in Tree/TableEditingTest which are unrelated to this fix.
>
> Jeanette Winzenburg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   removed commented imports

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/501