Few closed JButton swing manual test converted to automated and open sourced.
------------- Commit messages: - Opensource JButton manual tests - Open source few swing JFormattedTextField and JPopupMenu tests Changes: https://git.openjdk.org/jdk/pull/15831/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15831&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8316285 Stats: 783 lines in 8 files changed: 783 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/15831.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15831/head:pull/15831 PR: https://git.openjdk.org/jdk/pull/15831
