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Georges Racinet authored
In some cases it makes sense to display a different commit ID than the one used for addressing. Of course our existing `HgGitRepository` is a prime example of that, but it's not hard to imagine other ones. Up to now, we've changed some templates and user-facing to code to use directly some 'hgid'. For dual VCS support, as well as intermediate steps towards Mercurial native support, we'll need something more abstract than that. The method name, `hpd_display_id`, is voluntary obnoxious: we want to recognize at first glance that it's Heptapod-specific, and we want it to be easy to find all occurrences in the code base, in preparation for potential future times when we won't be needing it any more.
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