FULL PRODUCT VERSION :
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 7, 64 bit

A DESCRIPTION OF THE PROBLEM :
I appeared to have discovered a case in JavaFX where a TextField is rendered using the wrong style class.

The textfield retains its styling using the style class that has been removed. This only appears to happen in the following situation

 * style class removed whilst Node not attached to Scene AND
 * parent `GridPane` has a style-class assigned, even if that class doesn't have content.

Also posted here :https://stackoverflow.com/questions/45440102/javafx-css-class-not-removed-when-node-disconnected

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the example included in the report

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
TextField should have red background removed
ACTUAL -
TextField retains red background

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class RenderBug extends Application {

    private static final String ERROR = "error";

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        TextField field = new TextField();
        GridPane grid = new GridPane();
        grid.getStyleClass().add("some-random-class");
        grid.add(field, 0, 0);

        StackPane stack = new StackPane(grid);

        Scene scene = new Scene(stack);
        scene.getStylesheets().add("/foo.css");
        primaryStage.setWidth(300);
        primaryStage.setHeight(300);
        primaryStage.setScene(scene);
        primaryStage.show();

        Timeline line = new Timeline();

        line.getKeyFrames().add(new KeyFrame(Duration.seconds(4), event -> {
            field.getStyleClass().add(ERROR);
        }));
        line.getKeyFrames().add(new KeyFrame(Duration.seconds(5), event -> {
            stack.getChildren().remove(grid);
        }));
        line.getKeyFrames().add(new KeyFrame(Duration.seconds(6), event -> {
            field.getStyleClass().remove(ERROR);
        }));
        line.getKeyFrames().add(new KeyFrame(Duration.seconds(7), event -> {
            stack.getChildren().add(grid);
            System.out.println(field.getStyleClass());
        }));

        line.play();
    }

}


CSS file foo.css

.text-field.error {
    -fx-background-color: red;
}

.some-random-class {
    /** no content required */
}


---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Make sure node is attached to scene before making updates to styleClass