RFR: 8246745: ListCell/Skin: misbehavior on switching skin [v2]

[Ambarish Rapte]

On Fri, 11 Sep 2020 09:57:09 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

>> ListCellSkin installs listeners to the ListView/fixedCellSize that introduce a memory leak, NPE on replacing the
>> listView and incorrect update of internal state (see bug report for details)
>> Fixed by removing the listeners (and the internal state had been copied from listView on change) and access of listView
>> state when needed.
>> Added tests that failed before and pass after the fix, plus a sanity test to guarantee same (correct) behavior
>> before/after.
>
> Jeanette Winzenburg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   added code comment as requested in review

Marked as reviewed by arapte (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/251