import java.awt.Dimension;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;

import net.miginfocom.swing.MigLayout;

public class MigBugTest extends JPanel
{
   public MigBugTest()
   {
      setLayout(new MigLayout("insets dialog"));

      JButton button = new JButton("Button");

      //If you comment this out, the text area will size correctly.
      add(button, "pos n text.y text.x2 n");

      /*
       * This text area should grow horizontally and vertically, but it won't
       * as long as the button is included, unless you resize the frame to
       * force a re-layout.
       */
      JTextArea text = new JTextArea("Some text");
      add(text, "id text, push, grow");
   }

   public static void main(String[] args)
   {
      JFrame frame = new JFrame("Test");
      frame.setSize(new Dimension(300, 300));
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setContentPane(new MigBugTest());
      frame.setVisible(true);
   }
}