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nodemap: double check the source docket when doing incremental update

Authored by marmoute.

Description

nodemap: double check the source docket when doing incremental update

In theory, the index will have the information we expect it to have. However by
security, it seems safer to double check that the incremental data are generated
from the data currently on disk.

Differential Revision: https://phab.mercurial-scm.org/D7890