RFR: 8319779: SystemMenu: memory leak due to listener never being removed [v21]

[Andy Goryachev]

On Tue, 9 Jul 2024 09:06:58 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 one additional commit since the last revision:
> 
>   Allow scheduled runnables to be executed on the FX App Thread before checking for exceptions.

Created https://bugs.openjdk.org/browse/JDK-8337228 and https://bugs.openjdk.org/browse/JDK-8337229

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PR Comment: https://git.openjdk.org/jfx/pull/1283#issuecomment-2251200622