* proxy-login.c (proxy_login_tree_view_changed_cb): Use the unique
stamp to catch only the valid iterators.
Bug description:
If you right mouse click on your Groupwise email account, you can select "Proxy
Login" and a dialog appears with all of your previously used accounts in a
list. If you click focus into the list and then type in a keyboard letter it
crashes. This should position you at the first match of that letter, or at
least not crash :)