FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
If you have a VBox as the content of a Tab and you add elements to the VBox the TabPane doesn't resize until one switches to another Tab

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
When running the below chunk, clcking on the button on the second tab does not resize the tab pane until one switches to tab1


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TabPaneBug extends Application {

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

    TabPane tabPane = new TabPane();

    @Override
    public void start(Stage primaryStage) {

        ScrollPane root = new ScrollPane();
        HBox spContent = new HBox(10);
        root.setContent(spContent);
        
        

        tabPane.setStyle("-fx-border-color:red");
        spContent.getChildren().add(tabPane);

        Tab t1 = new Tab();
        tabPane.getTabs().add(t1);
        t1.setText("Tab 1");
        HBox tab1Content = new HBox();
        t1.setContent(tab1Content);

        Tab t2 = new Tab();
        tabPane.getTabs().add(t2);
        t2.setText("Tab 2");
        VBox tab2Content = new VBox();
        t2.setContent(tab2Content);

        buildTabPane(tab1Content, tab2Content);

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.setHeight(800);
        primaryStage.show();
        
// tabPane.tabMaxHeightProperty().bind(tab1Content.heightProperty());
// tabPane.tabMinHeightProperty().bind(tab1Content.heightProperty());
    }

    private void buildTabPane(Pane tab1Content, Pane tab2Content) {

        Button b2 = new Button("Click");
        tab2Content.getChildren().addAll(b2);
        b2.setOnAction(e -> {
            tab2Content.getChildren().add(new Label("Toooo"));
            tab2Content.getChildren().add(new Label("Toooo"));
            tab2Content.getChildren().add(new Label("Toooo"));
            tab2Content.getChildren().add(new Label("Toooo"));
            tab2Content.getChildren().add(new Label("Toooo"));
            tab2Content.getChildren().add(new Label("Toooo"));
        });
        //addData(astv, 30);

    }


}



REPRODUCIBILITY :
This bug can be reproduced always.