RFR: 8290040: Provide simplified deterministic way to manage listeners [v6]

[Nir Lisker]

On Fri, 14 Oct 2022 16:19:02 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Changing the documentation for `When` should not be part of this PR I think. What we should do maybe is add a note that this method should not be confused with `Bindings.when`. I'll let others weigh in.
>
> I like `conditionOn`.

I actually like `asLongAs` that was mentioned in another comment, but it looks odd :)

Lately, as I was reading some unrelated codebases and I came up with `updateWhile` (or `updateWhen`). The reason is that names like `when` and `conditionOn`, and even the restricted `if` and `while`, tell me just half the story. They tell me what happens "when", but not what happens "when not". The `bindings.When` binding is phrased as "`when` condition `then` A, `otherwise` B", which is I think it great. This binding is phrased as "`when` condition", but then what and what otherwise?

Because the binding updates its value when/while/as long as the condition holds and *doesn't update when the condition doesn't hold* (it just stays the same), I think that the phrasing "`update while` condition" (and don't update while not condition) gives a better description of the functionality.

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PR: https://git.openjdk.org/jfx/pull/830