RFR: 8280913: Create a regression test for JRootPane.setDefaultButton() method [v6]

[Manukumar V S]

On Fri, 4 Feb 2022 10:35:23 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> Manukumar V S has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed review comment - typed changed to pressed
>
> Marked as reviewed by aivanov (Reviewer).

@aivanov-jdk Can you please sponsor my changes?.

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PR: https://git.openjdk.java.net/jdk/pull/7278