RFR: 8290765: Remove parent disabled/treeVisible listeners [v2]

[Michael Strauß]

On Thu, 25 Aug 2022 22:18:44 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> `Node` adds InvalidationListeners to its parent's `disabled` and `treeVisible` properties and calls its own `updateDisabled()` and `updateTreeVisible(boolean)` methods when the property values change.
>> 
>> These listeners are not required, since `Node` can easily call the `updateDisabled()` and `updateTreeVisible(boolean)` methods on its children, saving the memory cost of maintaining listeners and bindings.
>
> Michael Strauß has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:
> 
>  - Replace null check by explicit underConstruction flag
>  - Merge branch 'master' into fixes/node-listener-cleanup
>  - Merge
>  - added tests
>  - Remove Node.disabled and Node.treeVisible listeners

I've resolved some merge conflicts with the latest `master` branch.
@arapte can you re-review?

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PR: https://git.openjdk.org/jfx/pull/841