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

[Andy Goryachev]

On Wed, 3 May 2023 20:22:57 GMT, Andy Goryachev <angorya 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.
>
> modules/javafx.graphics/src/main/java/javafx/scene/layout/GridPane.java line 737:
> 
>> 735:     }
>> 736: 
>> 737:     /**
> 
> we probably need to update the year `2011, 2023,` in the header

also in the test.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1125#discussion_r1184220807