view .arcconfig @ 47597:4b76f5ca79c4

mq: update the dirstate and its parent within a `parentchange` context

This is more correct, and move our plan of separated API for different dirstate
usage forward.

note: maybe the `parentchange` context manager should replace the dirstateguard
entirely ? (in this case we should probably deprecated dirstateguard).

Differential Revision: https://phab.mercurial-scm.org/D11017

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