Spinner within gridpane has unintended resize effects

FULL PRODUCT VERSION :
java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Development environment: NetBeans IDE 8.0.2

A DESCRIPTION OF THE PROBLEM :
When I use the Spinner component in a GridPane, and every item in it has to grow always and has its max size set to Double.MAX_VALUE, there are some unexplainable resize effects: whenever the Spinner component gets focus, or the value changes, it grows a bit, until the other components are on theirs minimum size.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
- Execute the provided executable test code.
- Click into the spinner component.
- Press Tab several times

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The spinner doesn't resize, since it has enough space to display the entered data.
ACTUAL -
The spinner grows in size until the combobox has reached its minimum size.

REPRODUCIBILITY :
This bug can be reproduced always.

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

  @Override
  public void start(Stage primaryStage)
  {
    ChoiceBox<String> box = new ChoiceBox<>();
    box.getItems().add("Item 1");
    box.setMaxWidth(Double.MAX_VALUE);
    GridPane.setHgrow(box, Priority.ALWAYS);

    Spinner spinner = new Spinner(1, 365, 1);
    spinner.setMaxWidth(Double.MAX_VALUE);
    GridPane.setHgrow(spinner, Priority.ALWAYS);

    GridPane gridPane = new GridPane();
    gridPane.setHgap(5);
    gridPane.setVgap(5);
    gridPane.setPadding(new Insets(5));
    gridPane.addRow(0, box, spinner);

    Scene scene = new Scene(gridPane, 1000, 400);
    primaryStage.setTitle("Spinner in GridPane");
    primaryStage.setScene(scene);
    primaryStage.show();
  }

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