unzip -l completion

[Peter Stephenson <p.stephenson@xxxxxxxxxxx>]

Completion of zip files is currently broken after "unzip -l" as well as
-v, and possibly other options since there are a whole pile that forbid
it; it only lists further options.

Looking at _zip, the problem at first looked to be obvious, but it
isn't.  I tinkered with it a bit further and got it so it completed zip
files --- but at that point it decided to complete non-zip files, too.
Then I gave up as life's too short.

Anyone know what to do?

pws