[GREENFOOT-631] Recompile/Reset while an Inspector is opened throws wrong-thread exception

Create an actor
open the object inspector for that actor
Reset or change the code and recompile while having the object inspector still open This will throw an exception: java.lang.IllegalStateException: Not on FX application thread

Tested on Mac and Windows.

In BlueJ / former Greenfoot-versions the object inspector is / was closed when the code was compiled. I guess this is the way it should be.

Reported by Thomas Karp.

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