RFR: 8323706: Move SimpleSelector and CompoundSelector to internal packages [v2]

[John Hendrikx]

On Fri, 2 Feb 2024 17:22:22 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add since tags
>
> This PR should probably be moved to draft. Now that the deprecation for removal is targeted for 23, this won't happen until JavaFX 24.

@kevinrushforth I think this is ready for a closer inspection again; in a strict sense there are API additions in this PR, but because of how `sealed` works, they're not accessible except to permitted sub types (and none of those permitted types are public API).

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

PR Comment: https://git.openjdk.org/jfx/pull/1333#issuecomment-2217687797