RFR: 8289384: Fix warnings: method does not override the inherited method since it is private to a different package

[Andy Goryachev]

On Mon, 11 Jul 2022 20:55:50 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> One question: did you check that all of the methods you changed to private scope are only called from other methods in the same class where they are defined (and not called from another class, such as an inner class or lambda, in the same file)?

yes, of course.   besides, all these cases would generate an error or a warning in eclipse.

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PR: https://git.openjdk.org/jfx/pull/824