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

[Sergey Bylokhov]

On Sat, 20 Dec 2025 03:31:24 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

> This is a test stabilization changeset for intermittent failures in the CI for Wayland.
> I made minimal changes where applicable. There was no goal to refactor all affected tests.
> 
> * `test/jdk/java/awt/Choice/PopupPosTest/PopupPosTest.java`
>  Without the added delay, the `stateChanged` variable could be overwritten by a previous `mouseMoveAndPressOnChoice` call.
> * `test/jdk/java/awt/Focus/ClearLwQueueBreakTest/ClearLwQueueBreakTest.java`
> The test may still fail intermittently in the CI, but an additional delay after setVisible won't cause any problems / https://bugs.openjdk.org/browse/JDK-8198618
> * `test/jdk/java/awt/Frame/FrameSetMinimumSizeTest.java` 
> The test made many setSize calls within a single `invokeAndWait` block and immediately checked the sizes. This works on the X11 server, but the XWayland implementation appears to be different. The `ConfigureNotify` with the correct sizes arrives later, but the test doesn't wait for it. Therefore, it was refactored.
> * test/jdk/java/awt/KeyboardFocusmanager/TypeAhead/ButtonActionKeyTest/ButtonActionKeyTest.java
> The test may still fail intermittently in the CI, but an additional delay after `setVisible` won't cause any problems / https://bugs.openjdk.org/browse/JDK-8257529
> * `test/jdk/java/awt/LightweightComponent/LightWeightTabFocus/LightWeightTabFocus.java`
> mouse button was not released causing subsequent test failures.
> * `test/jdk/java/awt/Modal/ToFront/DialogToFrontModeless1Test.java`
> details are in the test's comment.
>  
> This doesn't solve all the intermittent test issues related to Wayland (sometimes not even on Wayland).
> Some of the tests described in the bug report are no longer reproducible. I will file new issues for future failures.
> I also tested that it does not break other platforms testing as well.

Marked as reviewed by serb (Reviewer).

test/jdk/java/awt/KeyboardFocusmanager/TypeAhead/ButtonActionKeyTest/ButtonActionKeyTest.java line 92:

> 90:         frame.setVisible(true);
> 91:         Util.waitForIdle(robot);
> 92:         robot.delay(1000);

Isn’t it suspicious that it is not possible to show the frame quickly? I mean, 1 second is quite a long time. Is there any possibility to improve this on the toolkit side?

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PR Review: https://git.openjdk.org/jdk/pull/28939#pullrequestreview-3601457053
PR Review Comment: https://git.openjdk.org/jdk/pull/28939#discussion_r2637532162