If you run the test program attached to RT-3633 on the latest Marina build, you will get an NPE in SwingTextField:

javafxc MainWithHLayout

Exception in trigger:
java.lang.NullPointerException
at javax.swing.text.Utilities.getTabbedTextWidth(Utilities.java:256)
at javax.swing.text.Utilities.getTabbedTextWidth(Utilities.java:191)
at javax.swing.text.PlainView.getLineWidth(PlainView.java:643)
at javax.swing.text.PlainView.updateDamage(PlainView.java:541)
at javax.swing.text.PlainView.insertUpdate(PlainView.java:425)
at javax.swing.text.FieldView.insertUpdate(FieldView.java:276)
at javax.swing.plaf.basic.BasicTextUI$RootView.insertUpdate(BasicTextUI.java:1590)
at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.insertUpdate(BasicTextUI.java:1849)
at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:185)
at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:734)
at javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:693)
at javax.swing.text.PlainDocument.insertString(PlainDocument.java:114)
at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:655)
at javax.swing.text.JTextComponent.setText(JTextComponent.java:1693)
at javafx.ext.swing.SwingTextField$1$1.lambda(SwingTextField.fx:65)
at javafx.ext.swing.SwingTextField$1$1.invoke(SwingTextField.fx:64)
at javafx.ext.swing.SwingTextField$1$1.invoke(SwingTextField.fx:64)
at javafx.ext.swing.SwingComponent.doAndIgnoreJComponentChange(SwingComponent.fx:186)
at javafx.ext.swing.SwingTextField$1.onChange(SwingTextField.fx:64)
at javafx.ext.swing.SwingTextField$1.onChange(SwingTextField.fx:62)
at com.sun.javafx.runtime.location.ObjectVariable$2.onAction(ObjectVariable.java:141)
at com.sun.javafx.runtime.location.ObjectVariable$2.onAction(ObjectVariable.java:138)
at com.sun.javafx.runtime.location.DependencyIterator.action(AbstractLocation.java:539)
at com.sun.javafx.runtime.location.DependencyIterator.action(AbstractLocation.java:527)
at com.sun.javafx.runtime.util.Linkables.iterate(Linkables.java:82)
at com.sun.javafx.runtime.location.AbstractLocation.iterateChildren(AbstractLocation.java:282)
at com.sun.javafx.runtime.location.ObjectVariable.notifyListeners(ObjectVariable.java:138)
at com.sun.javafx.runtime.location.ObjectVariable.replaceValue(ObjectVariable.java:104)
at com.sun.javafx.runtime.location.ObjectVariable.set(ObjectVariable.java:115)
at com.sun.javafx.runtime.location.AbstractVariable$4.apply(AbstractVariable.java:132)
at com.sun.javafx.runtime.location.AbstractVariable.needDefault(AbstractVariable.java:151)
at javafx.ext.swing.SwingTextField.initialize$(SwingTextField.fx:62)
at MainWithHLayout.getGrid(MainWithHLayout.fx:38)
at MainWithHLayout.javafx$run$(MainWithHLayout.fx:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.javafx.runtime.provider.GUIRuntimeProvider$1.run(GUIRuntimeProvider.java:65)
at com.sun.javafx.tk.swing.SwingToolkit$StartupRoutine.run(SwingToolkit.fx:481)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)