mercurial/templates/monoblue/footer.tmpl

copies: explicitly filter out existing file in graftcopies

The `graftcopies` function does something very strange (maybe even wrong), it
calls `_filter` with a pair of changeset that does not match the one used to
compute the copies informations.

We are about to do some rework of `_filter` to make it closer to its documented
intent and fix a couple of bug. This means some of the logic that only make
sense for graft need to go somewhere else. We add the extra filtering with
proper documentation to `graftcopies`.

Differential Revision: https://phab.mercurial-scm.org/D9802

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