A default button receives onAction events triggered by pressing the Enter key when it has been removed from the scene graph.

This issue is very similar to https://javafx-jira.kenai.com/browse/RT-22106 but here the button is not removed from its parent's children list. Instead, the parent is removed from the scene.

Run the following code to reproduce the issue:

StackPane root = new StackPane();
Button btn = new Button("Default Button");
btn.setDefaultButton(true);
btn.setOnAction(new EventHandler<ActionEvent>() {
   @Override
   public void handle(final ActionEvent event) {
      System.out.println("DefaultButton");
   }
});
root.getChildren().add(btn);

Scene scene = new Scene(root, 400, 400);
primaryStage.setScene(scene);
primaryStage.show();

StackPane root2 = new StackPane();
root2.getChildren().add(new TextField());
scene.setRoot(root2);


The problem does not occur with the latest Java 8 EA build, btw.