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Subject: KerberosAgent Identity input should autocomplete to valid principal
CC: lxs@mit.edu
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Enter Identity's "Identity:" NSComboBox and Select Identity's new identity sheet's "Identity:" 
NSTextField should suggest validated versions of their contents when there isn't anything 
matching in the favorites. 

e.g. "user" would suggest "user@ATHENA.MIT.EDU" as long as nothing in the favorites starts 
with "user"