RFR: 8306996: Open source Swing MenuItem related tests [v2]

[Abhishek Kumar]

> This PR is to open source JMenuItem related swing tests.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Review comment update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13822/files
  - new: https://git.openjdk.org/jdk/pull/13822/files/ce55aebe..172ae128

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13822&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13822&range=00-01

  Stats: 204 lines in 4 files changed: 61 ins; 56 del; 87 mod
  Patch: https://git.openjdk.org/jdk/pull/13822.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13822/head:pull/13822

PR: https://git.openjdk.org/jdk/pull/13822