RFR: 8350917: Allow parent nodes to provide CSS styleable properties for child nodes

[John Hendrikx]

On Mon, 17 Feb 2025 01:15:37 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> 8350917: Allow parent nodes to provide CSS styleable properties for child nodes

@mstr2 / Dirk Lemmermann : This is a proof of concept PR for parent provided properties.  I've adapted HBox / VBox only in this PR, and I probably need to update the CSS documentation still.  I've opted to leave out the static HBox / VBox method to get these as a property (ie. `hgrowProperty`) although a property is used internally and so it could be exposed fairly easily later.  My plan is:

- Get some early feedback on the implementation, naming and the new API method in Styleable
- Decide the scope of this PR; I'd be in favor to get the core code in, then add more support later to ease reviews
   - Include new static property methods as well?
   - Include GridPane as well?
   - Any other controls?
- Add some specific unit tests for this new feature
- Update CSS docs
- Ready for review
- Integrate

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PR Comment: https://git.openjdk.org/jfx/pull/1714#issuecomment-2665333665