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If user opens fxz in editor, then closes it and opens again, two editors will be opened.
NPE caused by lack of panel with renderen graphics in some of opened panel clones is fixed (specifics of graphics rendering in fx). http://hg.netbeans.org/javafx/rev/37a3b06732b3 main issue is still to be fixed
it's a regression after fix of issue 178233
fixed by rolling back issue 178233 http://hg.netbeans.org/javafx/rev/61411f2560ae