RFR: 8319779: SystemMenu: memory leak due to listener never being removed [v18]

[Jose Pereda]

On Thu, 13 Jun 2024 20:07:32 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> 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 two additional commits since the last revision:
> 
>  - process more reviewer comments
>  - Process reviewer comments

Marked as reviewed by jpereda (Reviewer).

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PR Review: https://git.openjdk.org/jfx/pull/1283#pullrequestreview-2117171377