annotate .clang-format @ 43860:5e0f6451e2d2

chg: fix chg to work with py3.7+ "coercing" the locale

When the environment is empty (specifically: it doesn't contain LC_ALL,
LC_CTYPE, or LANG), Python will "coerce" the locale environment variables to be
a UTF-8 capable one. It sets LC_CTYPE in the environment, and this breaks chg,
since chg operates by:

- start hg, using whatever environment the user has when chg starts
- hg stores a hash of this "original" environment, but python has already set
  LC_CTYPE even though the user doesn't have it in their environment
- chg calls setenv over the commandserver. This clears the environment inside of
  hg and sets it to be exactly what the environment in chg is (without
  LC_CTYPE).
- chg calls validate to ensure that the environment hg is using (after the
  setenv call) is the one that the chg process has - if not, it is assumed the
  user changed their environment and we should use a different server. This will
  *never* be true in this situation because LC_CTYPE was removed.

Differential Revision: https://phab.mercurial-scm.org/D7550

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