RFR: 8295809: TreeTableViewSkin: memory leak when changing skin

[Andy Goryachev]

On Mon, 24 Oct 2022 19:06:26 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> as determined by SkinMemoryLeakTest (remove line 180) and a leak tester
> https://github.com/andy-goryachev-oracle/Test/blob/main/src/goryachev/apps/LeakTest.java
> 
> caused by:
> - adding and not removing listeners
> - adding and not removing event handlers/filters
> - adding and not removing cell factory
> - holding unnecessary instance in TreeTableViewSkin.treeTableViewSkin // test-only
> 
> NOTES:
> 1. this fix requires JDK-8294809 ListenerHelper and JDK-8295806 TableViewSkin.
> 2. there were more memory leaks in this skin than detected by SkinMemoryLeakTest, probably because of cell factory (?).  A manual test using LeakTest shows that there are no memory leaks after a) replacing skin, b) moving the components to a new window, and c) removing all the components from the window.

@aghaisas could you please take a look at this PR?

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PR: https://git.openjdk.org/jfx/pull/931