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changing-files: add clean computation of changed files for linear changesets

Authored by marmoute.

Description

changing-files: add clean computation of changed files for linear changesets

The files field is not reliable, so we need to compute things from scratch. We
deal with the second simplest case, linear changesets. We diff the current
manifest with the parent manifest. This reveal the file added, changed and
removed.

Differential Revision: https://phab.mercurial-scm.org/D9127