The previous [JDK-8319103](https://bugs.openjdk.org/browse/JDK-8319103) fix was
not complete.
The case where a menu item with a focusable component was not a direct child of
a window was missing(failing the `if (window == oppositeWindow.getParent() ) {`
check), so the ungrab event was posted prematurely.
This can be fixed by adding `waylandWindowFocusListener` to all submenus in
hierarchy.
The manual test updated to use this case, and also added an automated test that
checks that it didn't close prematurely.
-------------
Commit messages:
- 8342096: Popup menus that request focus are not shown on Linux with Wayland
Changes: https://git.openjdk.org/jdk/pull/22729/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22729&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8342096
Stats: 133 lines in 3 files changed: 121 ins; 4 del; 8 mod
Patch: https://git.openjdk.org/jdk/pull/22729.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/22729/head:pull/22729
PR: https://git.openjdk.org/jdk/pull/22729
