The following methods in Scene were former "impl_*" method that were intended to be encapsulated as part of JDK-8157295 in JDK 9, but were mistakenly left as public:
public void disposePeer()
public void enableInputMethodEvents(boolean enable)
public void processKeyEvent(KeyEvent e)
In the fix for JDK-8157295, the "impl_" prefix was removed, and the necessary accessors were added, but the "public" modifier was not removed.
We will deprecate these methods for removal with the intention to remove them from the public API in a future version of JavaFX.