Comment 18 for bug 963525

This requires a fix in bzr-git to use the new interface in dulwich and to somehow stash the mergetag data in bzr revision properties. I don't think there is anybody working on that at the moment.

The chances of that fix for bzr-git happening any time soon are remote, unfortunately. I am no longer involved with bzr-git or launchpad (just Dulwich) but it looks like the last change to bzr-git was more than 6 months ago.