title: Xcode's Change Case of Letter shortcut doesn't seem to work
body: <p>In Preferences->Key Bindings->Text Key Bindings Xcode has a "Change Case of Letter" key binding. However, when I assign a shortcut to this binding and then attempt to utilize it to swap the case of a letter in one of my source code files, it doesn't seem to do anything. </p>
  
  <p>I've tried positioning the cursor before and after the letter, and tried selecting the letter before triggering the assigned shortcut. Nothing seems to do anything. </p>
  
  <p>Does anybody know what I might be doing wrong?</p>