RFR: 8346154: [XWayland] Some tests fail intermittently in the CI, but not locally

[Alexander Zvegintsev]

On Mon, 22 Dec 2025 22:11:40 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> but it passed before on x11, correct? 

Most of the time, but not always, there are several CI failure reports on X11, but they don't happen as frequently as they do on XWayland.

> so it mighte be usefull to investigate why we need this delay now.

This delay does not help the test fail less frequently:

>This is just a precaution, and bringing it to a standard format for our tests setVisible / waitForIdle / delay.
Whether it's 1000 ms or 500 ms doesn't change anything for the test; it can still fail intermittently.

It is a real issue that can easily be reproduced on XWayland, [JBS comment](https://bugs.openjdk.org/browse/JDK-8257529?focusedId=14842868&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14842868):
> It is more easily reproduced on Ubuntu/XWayland using the modified ButtonActionKeyTest attached.
> 
> Can also be reproduced manually without the robot interactions

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PR Review Comment: https://git.openjdk.org/jdk/pull/28939#discussion_r2641883830