RFR: 8185886: Improve scrolling performance of TableView and TreeTableView

[yosbits]

On Tue, 18 Feb 2020 09:02:36 GMT, dannygonzalez <github.com+6702882+dannygonzalez at openjdk.org> wrote:

>> @dannygonzalez the reason for the `jcheck` failure is that you have commits with two different email addresses in your branch. At this point, it's probably best to squash the commits into a single commit with `git rebase -i master` (presuming that your local `master` is up to date), and then do a force-push.
> 
> @kevinrushforth just a note to say there are other ExpressionHelper classes (i.e. MapExpressionHelper, SetExpressionHelper and ListExpressionHelper) that also use arrays and suffer from the linear search issue when removing listeners. 
> 
> These however didn't appear in the critical path of the JavaFXThread and didn't come up in my profiling of TableView.
> 
> If this pull request is accepted, my opinion is that they should probably all move to using the same pattern as here, which is to use Maps instead of Arrays for their listener lists so that all these classes are uniform.
> 
> Thanks

Sorry for the interruption, send a PR that corrects the same problem.

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PR: https://git.openjdk.java.net/jfx/pull/108