RFR: 8264127: ListCell editing status is true, when index changes while editing [v14]

[Florian Kirmaier]

On Tue, 18 May 2021 10:14:11 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> Fixing ListCell editing status is true, when index changes while editing.
>
> Florian Kirmaier has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - 8264127
>    fixed assertion text,
>    exception handler is now installed/uninstalled like in TableCellTest
>  - 8264127
>    fixed trailing whitespace

I've done the 3 requested minor code convention changes

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