RFR: 8319779: SystemMenu: memory leak due to listener never being removed [v9]

[Johan Vos]

> A listener was added but never removed.
> This patch removes the listener when the menu it links to is cleared. Fix for https://bugs.openjdk.org/browse/JDK-8319779

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  Add additional test for IOOBE detection.
  This test comes from JDK-8323787

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1283/files
  - new: https://git.openjdk.org/jfx/pull/1283/files/1ce8fe9d..5f2070fb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1283&range=08
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1283&range=07-08

  Stats: 67 lines in 1 file changed: 51 ins; 0 del; 16 mod
  Patch: https://git.openjdk.org/jfx/pull/1283.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1283/head:pull/1283

PR: https://git.openjdk.org/jfx/pull/1283