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changing-files: add clean computation of changed files for roots

Authored by marmoute.

Description

changing-files: add clean computation of changed files for roots

The files field is not reliable, so we need to compute things from scratch. We
start with the simplest case root changesets. In the beginning they was nothing,
then user said "let there be files" and there were added files.

Differential Revision: https://phab.mercurial-scm.org/D9126