A DESCRIPTION OF THE PROBLEM :
I found that negative coordinates do not work on my Linux system (Debian, running Gnome). On Windows, it works as expected.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the provided source code and either change the starting position or simply drag around the visible window. The Java version does not matter, it can be anything from 8 to 12.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The behavior should be uniform all all platforms. So far, on Windows, I can move the application window as far as the mouse pointer hits the screen edge, effectively moving the Window over the visual bounds of the screen.

ACTUAL -
But on Linux, I can only move the window as long as none of the window boarders hits the screen edge. In effect, I can never move a window over the screen edge, making it only partly visible.

---------- BEGIN SOURCE ----------
package sample;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {
    Double deltaX = 0.0;
    Double deltaY = 0.0;

    @Override
    public void start(Stage primaryStage) {

        StackPane root = new StackPane();

        Scene s = new Scene(root, 800, 800);
        primaryStage.setScene(s);

        primaryStage.addEventHandler(MouseEvent.MOUSE_PRESSED, event -> {
            deltaX = event.getScreenX();
            deltaY = event.getScreenY();
        });

        primaryStage.addEventHandler(MouseEvent.MOUSE_DRAGGED, event -> {
            s.getWindow().setX(event.getScreenX() - deltaX);
            s.getWindow().setY(event.getScreenY() - deltaY);
        });


        primaryStage.show();
        primaryStage.getScene().getWindow().setX(-10);
    }


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

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

FREQUENCY : always