Please review HR fix for issue #235379

If a JFXPanel is present in a swing form NetBeans freeze totally
https://netbeans.org/bugzilla/show_bug.cgi?id=235379

Attempt to add JFXPanel (a Swing component for embedding JavaFX) to a form may 
lead to a hang if the JavaFX classes are not on IDE boot classpath and are 
loaded repeatedly from the project classpath. The fix prevents loading JavaFx 
classes from user project.

The risk is low, the fix does not affect anything else than trying to use 
JFXPanel.

http://hg.netbeans.org/jet-main/rev/51f06f6a7ba6

Thanks,
Tomas