RFR: 8283704: Add sealed modifier to java.awt.MultipleGradientPaint

[Alexey Ivanov]

On Fri, 1 Apr 2022 19:18:39 GMT, Phil Race <prr at openjdk.org> wrote:

> Along the same lines as other recent additions of the sealed modifier but this one is quite simple.
> Only MultiGradientPaint is touched. The two extant sub-classes it permits are already final
> 
> CSR for review : https://bugs.openjdk.java.net/browse/JDK-8284188
> 
> jtreg and JCK API tests pass

Marked as reviewed by aivanov (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8079