RFR: 8346581: JRadioButton/ButtonGroupFocusTest.java fails in CI on Linux [v2]

[Alexey Ivanov]

> **Problem:**
> 
> The `javax/swing/JRadioButton/ButtonGroupFocus/ButtonGroupFocusTest.java` test fails in CI on Linux.
> 
> The focus is on _Button 2_ instead of _Button 4_.
> 
> **Root cause:**
> 
> The additional logging revealed, an expected `KEY_PRESS` event. The test uses `Robot` API to press the <kbd>Tab</kbd> key and release it. When the test fails, there are two `KEY_PRESS` events followed by a single `KEY_RELEASE` event. Because the <kbd>Tab</kbd> key is pressed twice, the focus moves twice: from _Button 2_ (the initial state) to _Button 4_ and then back to _Button 2_.
> 
> **Fix:**
> 
> Use `CountDownLatch`es to track whether a radio button received focus. Detect the case where two `KEY_PRESS` events moved focus to _Button 2_ and report the failure.
> 
> Log focus movements and dispatched key events to facilitate failure analysis.
> 
> Take a screenshot of the test frame in case of failure.
> 
> These CI hosts seem to be quite slow, removing the delay added by `robot.setAutoDelay(100)` has reduced the number of unexpected `KEY_PRESS` events. This didn't affect Windows or macOS.

Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:

  Replace AWTEventListener and PropertyChangeListener with lambdas

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22977/files
  - new: https://git.openjdk.org/jdk/pull/22977/files/0e7376a3..e7991216

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22977&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22977&range=00-01

  Stats: 17 lines in 1 file changed: 0 ins; 11 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22977.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22977/head:pull/22977

PR: https://git.openjdk.org/jdk/pull/22977