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copies: properly copies parent dictionary before updating it

Authored by marmoute.

Description

copies: properly copies parent dictionary before updating it

This enforces the copy on write logic. Otherwise independant unrelated branches
could affected each other.

More testing of these case are coming, but I need that code landed to unlock
other performance work in parallel.

Differential Revision: https://phab.mercurial-scm.org/D9419