RFR: 8359601: Fix window button states of an extended stage [v2]

[Cormac Redmond]

On Tue, 17 Jun 2025 00:37:22 GMT, Cormac Redmond <duke at openjdk.org> wrote:

> Another suspected issue (not really related to this PR), close request handlers are not called when using EXTENDED. E.g.:
> 
> ```
>         stage.setOnCloseRequest(event -> {
>             System.out.println("Never called...");;
>         });
> ```
> 
> Same for dialogs...

Sample:


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Dialog;
import javafx.scene.layout.StackPane;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class MinimiseIconEnabledBug extends Application {
    @Override
    public void start(Stage primaryStage) {
        Button button = new Button("Click");
        button.setOnAction(e -> {
            final Dialog<Object> dialog = new Dialog<>();
            dialog.initOwner(primaryStage);
            // dialog.initStyle(StageStyle.EXTENDED); // uncomment for bug
            dialog.initModality(Modality.NONE);
            dialog.setResizable(true); // This is important
            dialog.getDialogPane().getButtonTypes().addAll(ButtonType.OK);
            dialog.setOnCloseRequest(dialogEvent -> {
                System.out.println("Close the dialog pane. This is not called when EXTENDED is used.");
            });
            dialog.show();
        });

        StackPane root = new StackPane(button);
        Scene scene = new Scene(root, 300, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

-------------

PR Comment: https://git.openjdk.org/jfx/pull/1831#issuecomment-2978574395