Keeping bugs visible after package change

[Marcel Stimberg]

Hi bugsquad,

I was debugging an evince printing bug (
https://bugs.launchpad.net/ubuntu/+source/evince/+bug/661724 ) that
turned out to be a bug in the cairo library. Now of course the
affected package should be changed to reflect this. But what is the
recommended procedure to leave this bug visible in evince (users will
certainly not look at the cairo bugs)? And what is the exact role of
the "metabug" tag ( = "This bug has a high probability of duplicate
reports being filed.")?

Thanks, best
  Marcel