RFR: 8139173: [macosx] JInternalFrame shadow is not properly drawn [v2]

[Toshio Nakamura]

On Thu, 27 Jan 2022 00:36:54 GMT, Phil Race <prr at openjdk.org> wrote:

>> Toshio Nakamura has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Applied review comments
>
> Looks so much better.

Thank you for reviewing, @prrace @mrserb.
Updated the patch. This testcase is limited to mac only.
> * @requires (os.family == "mac")

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PR: https://git.openjdk.java.net/jdk/pull/7228