Bugs in completion with RedirectingInterpreter

In testing some new stuff, I've come across a couple of pre-existing bugs in the RedirectingInterpreter; i.e. the one that the JNode shell uses by default:

1. Enter "dir |", and hit TAB. What should happen is that the completer should append a space, and offer a list of (all) aliases. Instead, the completer replaces the "|" with "dir ".
2. Enter "dir | " and hit TAB. What should happen is that the completer should offer a list of (all) aliases. What actually happens is that it offers a list of file/directory names.