RFR: 8277122: SplitPane divider drag can hang the layout [v2]

[Marius Hanl]

On Thu, 27 Jan 2022 15:21:33 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

>> just for reference - found the source of my [faintly remember](https://github.com/openjdk/jfx/pull/337/files/8a6fc1cf6cad2c453de17b71777ddd63fadb539e#r510975640)
>
> I see. Unfortunately though that was not done consistently during the past PRs.

Done. Also adjusted the copyright year ;)

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PR: https://git.openjdk.java.net/jfx/pull/669