AssertionError when orthogonalizing shape

[lpechacek]

What steps will reproduce the problem?

1. open the attached orthofault.osm
2. select the way and its topmost and leftmost nodes
3. use Orthogonalize Shape on the way

What is the expected result?
The shape is orthogonalized while the leftmost and topmost nodes retain their position.

What happens instead?
java.lang.AssertionError is thrown

Please provide any additional information below. Attach a screenshot if
possible.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-12-31 02:31:28
Last Changed Author: bastiK
Revision: 3751
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-12-30 16:31:05 +0100 (Thu, 30 Dec 2010)
Last Changed Rev: 3751

Identification: JOSM/1.5 (3751 en)
Memory Usage: 45 MB / 239 MB (12 MB allocated, but free)
Java version: 1.6.0_22, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: PicLayer (24308)
Plugin: Tracer (22177)
Plugin: fuzzer (15)
Plugin: osmarender (22765)
Plugin: reverter (23278)
Plugin: routes (23422)

java.lang.AssertionError
	at org.openstreetmap.josm.actions.OrthogonalizeAction.orthogonalize(OrthogonalizeAction.java:370)
	at org.openstreetmap.josm.actions.OrthogonalizeAction.actionPerformed(OrthogonalizeAction.java:158)
	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1633)
	at javax.swing.JComponent.processKeyBinding(JComponent.java:2851)
	at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:267)
	at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:229)
	at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2928)
	at javax.swing.JComponent.processKeyBindings(JComponent.java:2920)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2814)
	at java.awt.Component.processEvent(Component.java:6044)
	at java.awt.Container.processEvent(Container.java:2041)
	at java.awt.Component.dispatchEventImpl(Component.java:4630)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1850)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:712)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:990)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676)
	at java.awt.Component.dispatchEventImpl(Component.java:4502)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[lpechacek]

orthofault.osm

[lpechacek]

a screenshot to illustrate the reproduction steps