RFR: 8271071 accessibility of a table on macOS lacks cell navigation [v3]

[Alexander Zuev]

On Tue, 14 Sep 2021 15:50:34 GMT, Artem Semenov <github.com+36081106+savoptik at openjdk.org> wrote:

>> We've extended the current implementation of TableAccessibility to make sure that individual cells are voiced when navigating with the keyboard.
>
> Artem Semenov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   It is not clear why we should manage columns without children. Would it be better if you investigate it separately, and here you do not remove this method?

The biggest problem i have is that the new logic reverts the mechanic of the selection mode of the table - when no selection mode set it announces the content of all the cells in the current row and when either row or column selection mode is set it only announces the content of a single cell. Also when only cell selection is allowed it announces row as dimmed which is strange.

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PR: https://git.openjdk.java.net/jdk/pull/5466