D351: demandimport: disable by default if chg is being used

[yuja (Yuya Nishihara)]

yuja added a comment.


  > Setting `HGDEMANDIMPORT` for both the forked and non-forked chg client processes seems less cleaner.
  
  That seems less bad since the hg script doesn't have to know the chg stuff.

REPOSITORY
  rHG Mercurial

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

To: quark, #hg-reviewers, phillco
Cc: phillco, sid0, yuja, mercurial-devel