Java SE (Java Platform, Standard Edition)

Hi, got a question here !
For my application I need to know whenever the app's window is being focused or not. For this, I can use primaryStage.focusedProperty().addListener(..), which will warn me of changes in focus of the stage.

But I have realized that opening an Alert with this primaryStage as owner and with modality set to WINDOW_MODAL makes the `primaryStage` loose focus (even though the window is in reality focused, or at least in Windows).

Now the problem that I have is that I want to know when the Window is focused and not just the primaryStage; or at least know if the Alert is being focused, but I could not find how. I have tried to use similare properties on the alert(like onShowing and onHiding) without success.

Here is a piece of code to illustrate my problem :

package sample;
    
    import javafx.application.Application;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.scene.control.Alert;
    import javafx.stage.Modality;
    import javafx.stage.Stage;
    
    public class Main extends Application {
    
        @Override
        public void start(Stage primaryStage) throws Exception{
            Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
            primaryStage.setTitle("Hello World");
            primaryStage.setScene(new Scene(root, 300, 275));
    
            primaryStage.focusedProperty().addListener((observable, oldValue, newValue) -> {
                System.out.println("primaryStage focused : "+newValue);
            });
            primaryStage.show();
    
            //create a basic alert
            Alert alert = new Alert(Alert.AlertType.INFORMATION,"This is a test");
            alert.initModality(Modality.WINDOW_MODAL); //will block input to its owner window
            alert.initOwner(primaryStage);
            alert.onShowingProperty().addListener((observable, oldValue, newValue) -> {
                System.out.println("alert onShowing : "+newValue);
            });
            alert.onShownProperty().addListener((observable, oldValue, newValue) -> {
                System.out.println("alert onShown : "+newValue);
            });
            alert.onHidingProperty().addListener((observable, oldValue, newValue) -> {
                System.out.println("alert onHiding : "+newValue);
            });
            alert.onHiddenProperty().addListener((observable, oldValue, newValue) -> {
                System.out.println("alert onHidden : "+newValue);
            });
            alert.showAndWait();
        }
    
    
        public static void main(String[] args) {
            launch(args);
        }
    }

Basically it will print this :

primaryStage focused : true //stage is created and displayed
    primaryStage focused : false //alert is displayed, stage loses focus. alt+tab changes nothing
    primaryStage focused : true //alert closed by pressing 'ok'

Which is strange because of all other prints that it should produce.

Also ideally I would need a :

 primaryStage focused : true //stage is created and displayed
    primaryStage focused : false //alert is displayed, stage loses focus
    alert focused : true //alert gains focus
    alert focused : false //alt+tab to an other window
    alert focused : true //alt+tab back to this window
    alert focused : false //alert closed by pressing 'ok'
    primaryStage focused : true //stage regains focus

Or something similar. Does anyone has an idea to achieve this, or is this primaryStage losing focus to a WINDOW_MODAL Alert an issue that I should report ?

(Repost from StackOverflow, hope it doesn't bother anyone)