contrib/logo-droplets.svg

dirstate: make writing dirstate file out avoid ambiguity of file stat

Cached attribute repo.dirstate uses stat of '.hg/dirstate' file to
examine validity of cached contents. If writing '.hg/dirstate' file
out keeps ctime, mtime and size of it, change is overlooked, and old
contents cached before change isn't invalidated as expected.

To avoid ambiguity of file stat, this patch writes '.hg/dirstate' file
out with checkambig=True.

The former diff hunk changes the code path for "dirstate.write()", and
the latter changes the code path for "dirstate.savebackup()".

This patch is a part of "Exact Cache Validation Plan":

    https://www.mercurial-scm.org/wiki/ExactCacheValidationPlan

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