Select + drag may fail in JTree in JScrollPane if the row is only partially visible

import static org.fest.swing.timing.Pause.pause;


import java.awt.Component;

import java.awt.datatransfer.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.tree.*;

import org.fest.swing.core.*;

import org.fest.swing.finder.WindowFinder;

import org.fest.swing.fixture.FrameFixture;

public class SelectAndDnDTest

{

    public static void main(String[] args)

    {

        Robot robot = BasicRobot.robotWithNewAwtHierarchy();

        SwingUtilities.invokeLater(new Runnable()

        {

            @Override

            public void run()

            {

                JSplitPane pane = new JSplitPane();

                pane.setDividerLocation(150);

                JLabel label = new JLabel("Test");

                label.addMouseListener(new MouseAdapter()

                {

                    @Override

                    public void mousePressed(MouseEvent e)

                    {

                        System.out.println("Mouse press on label");

                    }

                });

                pane.setLeftComponent(new JScrollPane(createTree()));

                pane.setRightComponent(label);

                JFrame frame = new JFrame("Test");

                frame.setSize(640, 480);

                frame.getContentPane().add(pane);

                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

                frame.setVisible(true);

            }

        });

        FrameFixture window = WindowFinder.findFrame(JFrame.class).using(robot);

        pause(1000);

        window.tree().selectRow(1);

        pause(1000);

        window.tree().drag(1);

        pause(1000);

        window.tree().drop(0);

        robot.cleanUp();

    }

    protected static Component createTree()

    {

        final JTree tree = new JTree();

        tree.setDragEnabled(true);

        tree.setDropMode(DropMode.ON);

        tree.setTransferHandler(new TransferHandler()

        {

            @Override

            public int getSourceActions(JComponent c)

            {

                return COPY;

            }

            @Override

            public boolean importData(TransferSupport support)

            {

                Transferable t = support.getTransferable();

                try

                {

                    String s = (String) t.getTransferData(DataFlavor.stringFlavor);

                    DropLocation loc = support.getDropLocation();

                    TreePath dropPath = tree.getPathForLocation(loc.getDropPoint().x, loc.getDropPoint().y);

                    System.out.println("Dragged " + s + " and dropped on " + dropPath);

                }

                catch (Exception ex)

                {

                    ex.printStackTrace(System.err);

                    return false;

                }

                return true;

            }

            @Override

            public boolean canImport(TransferSupport support)

            {

                return true;

            }

            @Override

            protected Transferable createTransferable(JComponent c)

            {

                TreePath path = tree.getSelectionPath();

                return new StringSelection(path.toString());

            }

        });

        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root", true);

        TreeModel model = new DefaultTreeModel(root);

        root.add(new DefaultMutableTreeNode(

                "Child with a really, really long name that makes the center point move to the right very much."));

        tree.setModel(model);

        return tree;

    }

}

  @RunsInCurrentThread

  public Pair<Rectangle, Point> rowBoundsAndCoordinates(JTree tree, int row) {

    Rectangle rowBounds = tree.getRowBounds(validIndex(tree, row));

    // BEGIN FIX

    Rectangle visibleRect = tree.getVisibleRect();

    rowBounds = rowBounds.intersection(visibleRect);

    // END FIX

    if (rowBounds != null) return new Pair<Rectangle, Point>(rowBounds, pointAt(rowBounds));

    throw new LocationUnavailableException(concat("The tree row ", row, " is not visible"));

  }