ArgumentOutOfRangeException raised by Quick Fix if "ß" (eszett letter) is in comment

When having the German letter "ß" (eszett, Unicode U+00DF) in a
documentation comment and you want to use ReSharper's Quick Fix function in
order to call one of Agent Smith's spell checking/correction functions, an
ArgumentOutOfRangeException is raised and the  Quick Fix action list is not
shown.

What steps will reproduce the problem?
1. Write the German word "daß" into the comment, e.g. the summary tag.
2. Show action list (Alt+Return) from ReSharper Quick Fix function.
3. Exception occurrs and caught by ReSharper.

What is the expected behavior? What do you see instead?
* Do not trow an exception and correcly show the action list for Agent
Smith's spell checking/correction features.

What version of ReSharper, Visual Studio and Windows do you use?
* Visual Studio 2005 SP 1
* ReSharper 4.5.1231.7
* Agent Smith Plugin 1.3.7.38095

Please provide any additional information below.
* See attached file for exception details

Original issue reported on code.google.com by kradew...@saz.net on 25 May 2009 at 2:17

Attachments:

AgentSmith_Umlauts.txt

jiller / agentsmithplugin

ArgumentOutOfRangeException raised by Quick Fix if "ß" (eszett letter) is in comment #133