Branch heads should not include "heads" that are ancestors of other heads.
For example, given 1 (branch a) -> 2 (branch b) -> 3 (branch a)
I expect "hg heads a" to show only 3.
Discovered by running hg heads HEAD on the mutt repo, where older clients
committed default on top of HEAD.
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1 files, 1 changesets, 1 total revisions
changeset: 0:0acdaf898367
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: test
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A a
% Test issue 902
marked working directory as branch test
rolling back last transaction
default
% Test rollback of hg before issue 902 was fixed
marked working directory as branch test
rolling back last transaction
Named branch could not be reset, current branch still is: test
test