HGrow column constraints in GridPane work strangely if first cell has rowspan of more than 1.

For checking, please use the following application:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.stage.Stage;

public class GridPaneTest extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        GridPane root = new GridPane();
        
        // 1
        root.add(new Button("1 - I am for 2 cols"), 0, 0, 2, 1);
        //
        
        root.add(new Button("2"), 0, 1);
        root.add(new Button("3"), 1, 1);
        root.setGridLinesVisible(true);
        root.setPrefWidth(500);
        
        // 2
        ColumnConstraints c1 = new ColumnConstraints();
        c1.setHgrow(Priority.ALWAYS);
        ColumnConstraints c2 = new ColumnConstraints();
        c2.setHgrow(Priority.NEVER);
        root.getColumnConstraints().addAll(c1, c2);
        //
        
        Scene scene = new Scene(root, 500, 250);
        
        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

When commenting out sections "1" and "2", you can see how GridPane's layout is changing.