Comment 11 for bug 424

The Debian bug tracking system mechanism of marking bugs as found/fixed in particular versions (plus smart revision tracking to figure out whether another version should be considered fixed or not depending on whether it descends from a fixed version and so on) would be a nice idea here. You could just work off of Ubuntu package numbers for a simple version, but a smarter version could also note particular revisions of bzr trees (for bonus points, note that a particular Ubuntu package is built from such-and-such a bzr tree, and therefore said package version shares state with the bzr tree).

IMHO this is a major deficit in Launchpad.