RFR: 8309935: Mac - SystemMenuBar, IndexOutOfBoundsException on change

Tue Jun 13 13:59:24 UTC 2023

Fixing JDK-8309935 and providing a test for it.

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Commit messages:
 - Fixing JDK-8309935 and providing a test for it.

Changes: https://git.openjdk.org/jfx/pull/1152/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1152&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309935
  Stats: 93 lines in 2 files changed: 92 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1152.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1152/head:pull/1152

PR: https://git.openjdk.org/jfx/pull/1152