RFR: MemoryLeak: Scene.dirtyNodes and Parent.removed

[Florian Kirmaier]

Hi everyone,

I've now found a possible fix for a memory leak I discovered several weeks
ago.

Can someone take a look into it?

issue: https://bugs.openjdk.java.net/browse/JDK-8269907
PR: https://github.com/openjdk/jfx/pull/584

Greetings Florian