RFR: 8290040: Provide simplified deterministic way to manage listeners [v2]

[John Hendrikx]

On Wed, 31 Aug 2022 17:21:33 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Rename showing property to shown as it is already used in subclasses
>
> modules/javafx.base/src/main/java/javafx/beans/value/ObservableValue.java line 302:
> 
>> 300:      * ObservableValue<String> globalProperty = new SimpleStringProperty("A");
>> 301:      *
>> 302:      * // bind label's text to a global property only when it is shown:
> 
> "a label's"

`label` here is referring to the variable name, I think `a label` might be confusing -- I've changed it to `the label` for now.

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