Comment 8 for bug 219406

Apparently this is a known problem that can't be fixed. /usr/share/doc/bash-completion/README.gz FAQ says:

Q. Completion goes awry when I try to complete on something that contains
   a colon.

A. This is actually a 'feature' of bash. bash recognises a colon as
   starting a new completion token, which is often what you want when
   completing something like a PATH variable:

   $ export PATH=/bin:/sbin:/usr<Tab>

   Without the special treatment of the colon, the above wouldn't work
   without programmable completion, so it has long been a feature of
   the shell.

   Unfortunately, you don't want the colon to be treated as a special
   case when doing something like:

   $ man File::B<Tab>

   Here, the colons make bash think that it's completing the a new
   token that begins with 'B'.

   Unfortunately, there's no way to turn this off. The only thing you
   can do is escape the colons with a backslash.

So, just quote your : as \:, and roll your eyes or whatever you have to do.

I would change this to Won'tfix, but apparently ordinary mortals can't do that.