This patch looks promising from Scott Schaefer, and Sean Farley has a
repo with several patches available at
https://bitbucket.org/seanfarley/hgattic/overview
Thanks, I'm using the tip of Sean Farley's fork (20110829) with
success.
I should have mentioned that it works well with hg 1.5 as well as 1.9.
And, for that matter, it works with the 2.0 release candidate as well.
Works for 2.1 as well.