RFR: 8315594: Open source few headless Swing misc tests [v2]

[Alexander Zvegintsev]

On Wed, 6 Sep 2023 09:28:12 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> Few closed swing tests are open sourced
>
> Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Spacing issue

Marked as reviewed by azvegint (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15577#pullrequestreview-1615483355