RFR: 8294589: MenuBarSkin: memory leak when changing skin

[Jeanette Winzenburg]

On Thu, 29 Sep 2022 23:00:17 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Fixed memory leak by using weak listeners and making sure to undo everything that has been done to MenuBar/Skin in dispose().

modules/javafx.controls/src/main/java/com/sun/javafx/scene/control/LambdaMultiplePropertyChangeListenerHandler.java line 183:

> 181:                     consumer.accept(v);
> 182:                 }
> 183:             });

beware: unregister removes _all_ listeners (of type InvalidationListener) from the given property

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PR: https://git.openjdk.org/jfx/pull/906