RFR: 8316627: JViewport Test headless failure

[Phil Race]

On Wed, 20 Sep 2023 21:12:55 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

> Converted test needs headful tag added to avoid failures.

Since this test doesn't display anything I don't see why it needs sleep at all
Nor does it need invokeAndWait.
Its a simple unit test.

If the test needs real events to fire then it would become quite different.
It would need to be shown in  a JFrame etc and become a full headful test but that isn't apparent to me.

And remember: testing avoids fire drills.

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PR Comment: https://git.openjdk.org/jdk/pull/15847#issuecomment-1728461004