FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
Consider the following program:

    public class MainClass extends Application {
    
        public static void main(String[] arg) {
            launch(arg);
        }
    
        @Override
        public void start(Stage primaryStage) throws Exception {
            TabPane tabPane = new TabPane();
            tabPane.getSelectionModel().selectedItemProperty().addListener((ov, oldTab, newTab) -> {
                System.out.println("Tab change: " + oldTab + "/" + newTab);
            });
            Tab tab = new Tab("Test tab");
            tab.setOnCloseRequest((event) -> {
                System.out.println("Removing tab");
                event.consume();
                tabPane.getTabs().remove(tab);
            });
            System.out.println("Adding tab");
            tabPane.getTabs().add(tab);
            Group root = new Group(tabPane);
            Scene scene = new Scene(root);
            primaryStage.setScene(scene);
            primaryStage.show();
        }
    
    }

When this program is executed and user clicks close icon on Tab, then the total output of the program is:

    Adding tab
    Tab change: null/javafx.scene.control.Tab@70b1aa69
    Removing tab
    Tab change: javafx.scene.control.Tab@70b1aa69/null
    Tab change: null/javafx.scene.control.Tab@70b1aa69

As you see there are two `Tab change` events after removing tab but there must be only one.


REPRODUCIBILITY :
This bug can be reproduced always.