RFR: 8091153: Customize the Table Button Menu

[Kevin Rushforth]

On Sat, 13 May 2023 19:11:26 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.

This adds new public API and, as such, will need additional discussion. Can you start a thread on the openjfx-dev mailing list?

-------------

PR Comment: https://git.openjdk.org/jfx/pull/1135#issuecomment-1547870144