To reproduce:
1. Insert text in JTextPane
2. Jump to the start of the text
3. Insert character(s), each of them 
   is followed by one exception

Source:
package hox.online.client.document.bzv;

import java.awt.event.*;
import com.sun.java.swing.*;

public class Bug1 extends JFrame {
    
    public Bug1 () {
    }
    
    public static void main(String[] args){
	Test frame = new Test();
	frame.addWindowListener(new WindowAdapter() {
	    public void windowClosing(WindowEvent e) {
		System.exit(0);
	    }
	});
	frame.getContentPane().add(new JTextPane());
	frame.setSize(600, 250);
	frame.show();
    }
}


Exception:
Exception occurred during event dispatching:
com.sun.java.swing.text.StateInvariantError: infinite loop in formatting
	at com.sun.java.swing.text.ParagraphView.rebuildRows(ParagraphView.java:163)
	at com.sun.java.swing.text.ParagraphView.layout(ParagraphView.java:127)
	at com.sun.java.swing.text.ParagraphView.insertUpdate(ParagraphView.java:596)
	at com.sun.java.swing.text.BoxView.insertUpdate(BoxView.java:308)
	at com.sun.java.swing.text.DefaultTextUI$RootView.insertUpdate(DefaultTextUI.java:834)
	at com.sun.java.swing.text.DefaultTextUI$UpdateHandler.insertUpdate(DefaultTextUI.java:1050)
	at com.sun.java.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:137)
	at com.sun.java.swing.text.AbstractDocument.insertString(AbstractDocument.java:415)
	at com.sun.java.swing.JTextPane.replaceSelection(JTextPane.java:148)
	at com.sun.java.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(DefaultEditorKit.java:650)
	at com.sun.java.swing.text.JTextComponent.processComponentKeyEvent(JTextComponent.java:1026)
	at com.sun.java.swing.JComponent.processKeyEvent(JComponent.java:1256)
	at java.awt.Component.processEvent(Component.java:2138)
	at java.awt.Container.processEvent(Container.java:890)
	at java.awt.Component.dispatchEventImpl(Component.java:1764)
	at java.awt.Container.dispatchEventImpl(Container.java:935)
	at java.awt.Component.dispatchEvent(Component.java:1704)
	at java.awt.LightweightDispatcher.processKeyEvent(Container.java:1407)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1393)
	at java.awt.Container.dispatchEventImpl(Container.java:922)
	at java.awt.Window.dispatchEventImpl(Window.java:443)
	at java.awt.Component.dispatchEvent(Component.java:1704)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:63)

I've searched the bug database but found no such
thing like this. Similar problems seem to be
4116627, 4108463 and 4124391.
(Review ID: 28138)
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