RFR: 8307208: Add GridPane constructor that accepts hGap and vGap values

[Andy Goryachev]

On Wed, 3 May 2023 20:13:42 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> This PR adds a new constructor to `GridPane` that accepts a `hgap` and a `vgap`.
> As also written in the ticket, this is a small enhancement to improve the creation of a layout involving a `GridPane` without FXML.
> In my experience, the `hgap` and the `vgap` are almost always set when creating a layout with the `GridPane`, as a space between the content just looks much better.
> 
> This also fits well with other classes like `HBox` and `VBox`, which also provide a constructor that accepts the spacing.

Not related to these changes specifically, but why does GridPane adds a listener in the constructor

getChildren().addListener((Observable o) -> requestLayout());

and VBox/HBox do not?

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PR Comment: https://git.openjdk.org/jfx/pull/1125#issuecomment-1533725376