Issue 3044: Method editor failing

http://code.google.com/p/pharo/issues/detail?id=3044

Steps to reproduce:
1. Create a method
2. Declare a temp (i.e. myVariable)
3. Write some code sending a message to a non-existing temp with a name similar to the one you declared (i.e. myVar)
4. Try to save. You should get a suggestion to change myVar -> myVariable.
5. Accept the suggestion
6. Your code will be modify in a wrong way: intead of getting "myVariable" you will get "myVariableiable"