D2686: xdiff: add a preprocessing step that trims files

[indygreg (Gregory Szorc)]

indygreg accepted this revision.
indygreg added a comment.
This revision is now accepted and ready to land.


  I almost accepted the last version and this one is mostly cosmetic changes. So LGTM!
  
  Your work here is very much appreciated. Thank you for doing the thorough performance analysis.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2686

To: quark, #hg-reviewers, indygreg
Cc: indygreg, mercurial-devel