D3212: patch: implement a new worddiff algorithm

[quark (Jun Wu)]

quark added a comment.


  This is the before and after comparison:
  
  F69700: worddiff-compare.png <https://phab.mercurial-scm.org/F69700>

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3212

To: quark, #hg-reviewers, durin42
Cc: mercurial-devel