The problem is still there in hardy:
# apt-get purge zope3 [...] The following packages will be REMOVED gaphor* zope3*
Package: gaphor Version: 0.12.5-1ubuntu1
The problem is still there in hardy:
# apt-get purge zope3
[...]
The following packages will be REMOVED
gaphor* zope3*
Package: gaphor
Version: 0.12.5-1ubuntu1