RFR: 8306996: Open source Swing MenuItem related tests [v4]

[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:

  Check for all LAFs

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13822/files
  - new: https://git.openjdk.org/jdk/pull/13822/files/2db3db78..c286563c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13822&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13822&range=02-03

  Stats: 18 lines in 2 files changed: 10 ins; 0 del; 8 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