Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Thu, 10 Jan 2013 00:41:40 +0100] rev 18306
changelog: add a `branch` method, bypassing changectx
The only way to access the branch of a changeset is currently to
create a changectx object and access its `branch()` method. Creating
a new Python object is costly and has a huge impact on code doing
heavy access to `branch()` (like branchmap).
This change introduces a new method on changelog that allows direct
access to the branch of a revision. See the next changeset for impact.