D351: demandimport: disable if chg is being used

[yuja (Yuya Nishihara)]

yuja added a comment.


  Can you update the comment in chgserver.py in new series? It says
  "CHGINTERNALMARK is temporarily set by chg client to detect if chg will start another chg."

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D351

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Cc: phillco, sid0, yuja, mercurial-devel