RFR: 8091153: Customize the Table Button Menu [v4]

[Andy Goryachev]

On Wed, 17 May 2023 19:29:13 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

>> This PR implements a way to override the table column menu. 
>> When the `cornerRegion` is pressed, it will now call the `showColumnMenu` method. This new method is protected and therefore can be overidden by developers. If not overridden, the known default column 'ContextMenu' is created and shown.
>> 
>> This PR also resolves [JDK-8091419 ](https://bugs.openjdk.org/browse/JDK-8091419) (The method `showColumnMenu` can be overridden and made public now)
>> 
>> This PR also helps with [JDK-8092148](https://bugs.openjdk.org/browse/JDK-8092148), but does not address all the points mentioned in the ticket. 
>> Now that everyone can provide their own implementation, we can think of treating the current implementation of the table column menu as an [MVP](https://en.wikipedia.org/wiki/Minimum_viable_product) and any other requested feature/idea should be fulfilled by providing your own implementaion of the menu.
>
> Marius Hanl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8091153: Added period to @implNote

tested on macOS with Tree/TableView, working as expected.

I wish the default implementation did not hide the popup on mouse click, to allow for toggling multiple columns, but it is out of scope for this PR.

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Marked as reviewed by angorya (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1135#pullrequestreview-1431430131