RFR: 8345767: javax/swing/JSplitPane/4164779/JSplitPaneKeyboardNavigationTest.java fails in ubuntu22.04

[Prasanta Sadhukhan]

javax/swing/JSplitPane/4164779/JSplitPaneKeyboardNavigationTest.java fails in ubuntu22.04 citing


Verifier 1 failed, rightButton2 is not focus owner,F6 doesn't transfer focus to the right/bottom side of the splitpane
Verifier 2 passed
Verifier 3 passed
Verifier 4 passed
----------System.err:(11/842)----------
java.lang.RuntimeException: Test failed, verifiers 1, failed for com.sun.java.swing.plaf.motif.MotifLookAndFeel 


seems like focus is not transferred in time but is very intermittent...Added stability fixes with waitForIdle, delay and test passed in several OCI systems without issue

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Commit messages:
 - Test fix

Changes: https://git.openjdk.org/jdk/pull/22631/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22631&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345767
  Stats: 12 lines in 1 file changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22631/head:pull/22631

PR: https://git.openjdk.org/jdk/pull/22631