RFR: 8306996: Open source Swing MenuItem related tests [v5]

[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/c286563c..0ae07169

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13822&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13822&range=03-04

  Stats: 7 lines in 1 file changed: 1 ins; 4 del; 2 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