Possible leak on setOnAction

[Thiago Milczarek Sayão]

Hi,

I'm pretty sure setOnAction is holding references.

I have a "Open Windows" menu on my application where it lists the Stages
opened and if you click, it calls stage.toFront():

menuItem.seOnAction(e -> stage.toFront())

I had many crash reports, all OOM. I got the hprof files and analyzed them
- turns out this was holding references to all closed stages.

To fix it, I call setOnAction(null) when the stage is closed.

I will investigate further and provide an example.

-- Thiago.
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