msva marginal UI should display if there are valid alternate User IDs
Currently, the msva marginal UI only shows if there are valid certifiers that are independent of the key itself.
However, the key might have fully-valid User IDs; i think this warrants a marginal UI as well.
An example case is:
Bob is known as "Bob bob@example.org", which is attached (with full calculated validity) to his key. Bob then gets a job with Example Corp., and adds a new User ID "Bob bob@example.com".
Even if no valid certifications from other users are found on that user ID, a reasonable marginal UI might say something like:
This key doesn't have any calculated validity for signing e-mail as Bob bob@example.com. But it does appear to be valid for Bob bob@example.org.
Do you want to accept this key for Bob bob@example.com ?
(from redmine: created on 2011-01-03)