J2SE Version (please include all output from java -version flag):
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)

Does this problem occur on J2SE 5.0.x or 6.0? Yes / No (pick one)
Yes

Operating System Configuration Information (be specific):
Microsoft Windows XP [Version 5.1.2600]

Bug Description:
setFirstLineIndent causes sizes to be wrong

When I run the following code I notice two (probably related) problems:
1) The cursor is twice as high as it should be
2) The text does not fit in the allocated area

import static javax.swing.JFrame.*;
import javax.swing.*;
import javax.swing.text.*;

public class Test {
  public static void main(String[] args) {
    try {
      JEditorPane pane = new JEditorPane("text/html", "");
      SimpleAttributeSet attributeSet = new SimpleAttributeSet();
      StyleConstants.setFirstLineIndent(attributeSet, 36);
      pane.getDocument().insertString(0, "Sample Text\nSample Text", attributeSet);
      JPanel panel = new JPanel();
      panel.add(pane);
      JFrame frame = new JFrame();
      frame.add(panel);
      frame.pack();
      frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
      frame.setVisible(true);
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }
}