[jdk21u-dev] RFR: 8316164: Opensource JMenuBar manual test

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 8f4dfc443ba5820f5799fff1418d6632d502d57b

Changes: https://git.openjdk.org/jdk21u-dev/pull/388/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=388&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316164
  Stats: 128 lines in 1 file changed: 128 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/388.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/388/head:pull/388

PR: https://git.openjdk.org/jdk21u-dev/pull/388