RFR: 8341372: BackgroundPosition, BorderImage, BorderStroke, CornerRadii should be final

[Kevin Rushforth]

On Tue, 1 Oct 2024 23:04:40 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> > There might be a very narrow use case (like debugging) when developer might need to extend to supply a custom `toString()` or some other method.
> > From a high level design standpoint, I do agree with making these classes final.
> 
> Maybe, but that's not a sufficient reason to allow subclassing, as the same could be said for all cases of encapsuluation and inheritance control.

I agree that this use case should not be a consideration.

As noted, this is an incompatible change, but we have a precedent for doing this for similar classes when we made the Color class final in JDK 8 with [JDK-8118119](https://bugs.openjdk.org/browse/JDK-8118119).

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PR Comment: https://git.openjdk.org/jfx/pull/1587#issuecomment-2388415296