[jdk25u] RFR: 8365615: Improve JMenuBar/RightLeftOrientation.java

[Alexey Ivanov]

This pull request contains a backport of commit [afa8e79b](https://github.com/openjdk/jdk/commit/afa8e79ba1a76066cf969cb3b5f76ea804780872) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Alexey Ivanov on 28 Aug 2025 and was reviewed by Phil Race and Prasanta Sadhukhan.

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Commit messages:
 - Backport afa8e79ba1a76066cf969cb3b5f76ea804780872

Changes: https://git.openjdk.org/jdk25u/pull/149/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=149&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/jdk25u/pull/149.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/149/head:pull/149

PR: https://git.openjdk.org/jdk25u/pull/149