[jdk21u-dev] RFR: 8365615: Improve JMenuBar/RightLeftOrientation.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport afa8e79ba1a76066cf969cb3b5f76ea804780872

Changes: https://git.openjdk.org/jdk21u-dev/pull/2341/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2341&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365615
  Stats: 56 lines in 1 file changed: 17 ins; 10 del; 29 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2341.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2341/head:pull/2341

PR: https://git.openjdk.org/jdk21u-dev/pull/2341