import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 *
 * @author Alexander Kouznetsov
 */
public class Bug extends Application {

    public static void main(String[] args) {
        launch(args);
    }
    
    int counter = 0;

    @Override
    public void start(Stage stage) throws Exception {

        final FlowPane root = new FlowPane();

        final Scene scene = new Scene(root);

        stage.setScene(scene);
        stage.show();
        
        final VBox vBox = new VBox(5);
        
        ScrollPane scrollPane = new ScrollPane();
        scrollPane.setStyle("-fx-background-color: black;");
        scrollPane.setContent(vBox);
        
        Scene scene2 = new Scene(scrollPane);
//        scene2.setFill(Color.BLACK);
        
        Stage stage2 = new Stage();
        stage2.setScene(scene2);
        stage2.show();
        
        Timeline timelineRenderToImage = new Timeline(new KeyFrame(Duration.millis(10), new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                
                // comment out the following two lines to verify it is affecting
                // rendering
                Image image = Image.impl_fromPlatformImage(scene.renderToImage(null));
                vBox.getChildren().add(new ImageView(image));
            }
        }), new KeyFrame(Duration.millis(10), new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                if (counter % 10 == 0) {
                    root.getChildren().clear();
                } else {
                    root.getChildren().add(new Text((counter % 10) + " "));
                }
                counter++;
            }
        }));
        timelineRenderToImage.setCycleCount(100);
        timelineRenderToImage.play();
    }

}