RFR: 8185886: Improve scrolling performance of TableView and TreeTableView

[Nir Lisker]

On Mon, 24 Feb 2020 11:09:30 GMT, dannygonzalez <github.com+6702882+dannygonzalez at openjdk.org> wrote:

>> Agreed, will change.
> 
> Nope, actually:
> `listeners.keySet().removeIf(p::test) `
> 
> is not the same as:
> `listeners.entrySet().removeIf(e -> p.test(e.getKey()));`
> 
> We need to test against the entrySet.key not the entrySet itself.

> We need to test against the entrySet.key not the entrySet itself.

I suggested to test against the elements in `keySet()`, which are the same as the ones in `entrySet().getKey()`.

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