When a nested column is dragged, the column drag header (blue) is positioned wrong.
It appears at the very left of the table and not where the column is.

Note: The column reordering however works as intended.

### SOURCE ###

Drag any nested column, verify that the column drag header appears at the beginning of the table.

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class TableBug extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        TableView<String> tableView = new TableView<>();
        tableView.setFixedCellSize(24);

        tableView.setEditable(true);
        tableView.setItems(FXCollections.observableArrayList("a", "b", "c", "d", "e", "f", "g", "h", "i"));

        TableColumn<String, String> col1 = new TableColumn<>("checkbox");
        col1.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col2 = new TableColumn<>("text");
        col2.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col3 = new TableColumn<>("text2");
        col3.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col4 = new TableColumn<>("text3");
        col4.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        tableView.getColumns().addAll(col1, col2, col3, col4);

        TableColumn<String, String> col5 = new TableColumn<>("text3687645");
        col5.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col6 = new TableColumn<>("text3687645");
        col6.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col7 = new TableColumn<>("text3687645");
        col7.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col8 = new TableColumn<>("text3687645");
        col8.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        TableColumn<String, String> col9 = new TableColumn<>("text3687645");
        col9.setCellValueFactory(cellData -> new SimpleStringProperty(cellData.getValue()));

        col7.getColumns().addAll(col8, col9);

        col5.getColumns().addAll(col6, col7);

        tableView.getColumns().add(col5);

        BorderPane pane = new BorderPane(tableView);

        Scene scene = new Scene(pane);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

### SOURCE END ####