RFR: 8264127: ListCell editing status is true, when index changes while editing

[Jeanette Winzenburg]

On Wed, 24 Mar 2021 14:58:40 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

> Fixing ListCell editing status is true, when index changes while editing.

good catch, yet another property that's not correctly updated on index change :) 

Quick questions:
- what are the macroscopic effects (that is in a running list) that you see without fixing it?
- do we want mere cell re-use fire a editCancel? (which the list seems to ignore in the test, don't know why)

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PR: https://git.openjdk.java.net/jfx/pull/441