When doing a case insensitive search and replace, if the replacement text is all lowercase then it should be transformed
to match the case of the text it replaces.  For example, I search for 'username' and replace it with 'name' (case
insensitive).  The current behaviour is to replace everything with the provided replacement text verbatim, e.g.

 |  print "Username: "
 |  username = gets
 |  puts "Hello #{username}"

becomes

 |  print "name: "
 |  name = gets
 |  puts "Hello #{name}"


Ideally it should produce the following result:

 |  print "Name: "
 |  name = gets
 |  puts "Hello #{name}"

If I'm not mistaken the renaming refactoring tool suffers from the same problem.