JavaFX: Why does stage.setResizable(false) cause additional margins

java, javafx, javafx-8, windows-7-x64

This small JavaFX test application

import javafx.application.Application;import javafx.scene.Scene;import javafx.scene.layout.BorderPane;import javafx.scene.paint.Color;import javafx.scene.shape.Rectangle;import javafx.stage.Stage;public class ApplicationWithNonResizableStage extends Application {    public static void main(final String[] args) {        launch(args);    }    @Override    public void start(final Stage primaryStage) throws Exception {        final Rectangle rectangle = new Rectangle(200, 100, Color.POWDERBLUE);        final BorderPane pane = new BorderPane(rectangle);        final Scene scene = new Scene(pane);        primaryStage.setScene(scene);        primaryStage.setResizable(false);        primaryStage.show();    }}

produce a window with unwanted padding:

stage with margin

Removing the call primaryStage.setResizable(false) also removes the effect:

stage without margin

What is going wrong?

Best Solution

As already commented, this different behaviour of !/resizable smells like a bug (somebody might consider filing an issue ;-)

A shorter (than sizing manually) way around is to explicitly fit the stage to the scene:

primaryStage.setScene(scene);primaryStage.setResizable(false);primaryStage.sizeToScene();

Just noticed that this works for jdk8, but not jdk7.

For convenience, a bug update: the original report filed by jewelsea was closed as a duplicate of (in new coordinates) https://bugs.openjdk.java.net/browse/JDK-8089008 - still open, commented to be win-only.