D464: editor: use an unambiguous path suffix for editor files

[durin42 (Augie Fackler)]

durin42 added a comment.


  Relevant continuous build failure: https://buildbot.mercurial-scm.org/builders/FreeBSD%20hg%20tests/builds/909/steps/run-tests.py%20%28python%202.7.13%29/logs/stdio - @mbolin could I get you to take a look?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D464

To: mbolin, quark, durin42, #hg-reviewers, ryanmce
Cc: yuja, smf, ryanmce, mercurial-devel