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

[Andy Goryachev]

On Fri, 19 Jan 2024 18:12:26 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> I note that we could still consider deprecating the `SimpleSelector` and `CompoundSelector` classes for _eventual_ removal

I like the idea of deprecating with the following removal, coupled with adding the "missing" APIs to Selector.  I think the lack of this method in the base class was an unfortunate oversight, and we should fix that.

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PR Comment: https://git.openjdk.org/jfx/pull/1333#issuecomment-1900883755