Add a check and storage for a custom DefaultMenuBar in Desktop.java and adds key event handling for a custom DefaultMenuBar in KeyboardManager.java. Also adds a manual test for checking that key event handling is correct for DefaultMenuBars.
------------- Commit messages: - add test, fix defaultMenuBar menu item actions Changes: https://git.openjdk.org/jdk/pull/19714/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19714&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8333589 Stats: 152 lines in 3 files changed: 152 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/19714.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19714/head:pull/19714 PR: https://git.openjdk.org/jdk/pull/19714
