RFR: 8328697: SubMenuShowTest and SwallowKeyEvents tests stabilization

[Alexander Zuev]

On Thu, 21 Mar 2024 13:02:29 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

> Two tests may fail intermittently on Wayland, the standard `waitForIdle` and `delay` fixes the issue.
> 
> Manual and CI testing looks good.

Marked as reviewed by kizune (Reviewer).

Since you are editing these files you can also drop the @author tag from the test metadata. Otherwise looks good.

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PR Review: https://git.openjdk.org/jdk/pull/18431#pullrequestreview-1952390195
PR Comment: https://git.openjdk.org/jdk/pull/18431#issuecomment-2012439701