TracMercurial for 0.13: rebasing [9946:10432/plugins/0.13/mercurial-plugin] on top of 0.12.0.26 (r10524).
Use the Mercurial context API for `MercurialRepository.parent_revs`.
Authored by: cboos 2011-02-03
Parent: [r10526]
Child: [r10528]