RFR: 8295426: MenuButtonSkin: memory leak when changing skin [v2]

[Andy Goryachev]

On Wed, 30 Nov 2022 17:00:55 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> as determined by SkinMemoryLeakTest (remove line 170) and a leak tester
>> https://github.com/andy-goryachev-oracle/Test/blob/main/src/goryachev/apps/LeakTest.java
>> 
>> Also applies to SplitMenuButton, since they share the same base class MenuButtonSkinBase.
>> 
>> Make sure to configure the current test in LeakTest:
>> protected final Type WE_ARE_TESTING = Type.MENU_BUTTON; // or SPLIT_MENU_BUTTON
>> 
>> In addition, there seems to be another failure scenario when simply replacing the skin - no menu is shown upon a click. To reproduce, launch LeakTest and click once on the [Replace Skin] button. Second click restores the function.
>> 
>> caused by:
>> - adding and not removing EventHandlers
>> - setting and not clearing onAction handlers
>> - incorrect logic in setting mousePressed/mouse/Released handlers
>
> Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 37 commits:
> 
>  - Merge remote-tracking branch 'origin/master' into
>    8295426.menu.button.skin
>  - Merge remote-tracking branch 'origin/master' into
>    8295426.menu.button.skin
>  - 8295426: listener helper update
>  - Merge remote-tracking branch 'origin/8294809.listener.helper' into 8295426.menu.button.skin
>  - 8294809: review comments
>  - Merge remote-tracking branch 'origin/master' into 8294809.listener.helper
>  - 8294809: whitespace
>  - 8294809: no public api
>  - 8294809: map change listener
>  - Merge remote-tracking branch 'origin/master' into 8294809.listener.helper
>  - ... and 27 more: https://git.openjdk.org/jfx/compare/0a785ae0...800d3f1e

@aghaisas : 
Could you please review this next?  There is another PR that touches the same area, #937.  Thanks!

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PR: https://git.openjdk.org/jfx/pull/919