TestJTabbedPaneBackgroundColor.java test was failing intermittently in CI jobs. Test is modified to access UI components on EDT for stabilizations. CI testing seems fine after test change. Link attached in JBS.
------------- Commit messages: - Test stabilization Changes: https://git.openjdk.org/jdk/pull/24148/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24148&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8343891 Stats: 23 lines in 1 file changed: 12 ins; 3 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/24148.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24148/head:pull/24148 PR: https://git.openjdk.org/jdk/pull/24148
