Re: show whitespace problems by default in diff-mode

[Dan Nicolaescu <dann@ics.uci.edu>]

Miles Bader <miles@gnu.org> writes:

  > Óscar Fuentes <ofv@wanadoo.es> writes:
  > > It's not only about pedantry. The worst thing about trailing whitespace
  > > is that it tends to come and go while editing the file and when finally
  > > the changes are committed it creates noise on VCS diffs and is
  > > considered antisocial. This is why on some sites trailing whitespace is
  > > forbidden and people there would appreciate a method for easy detection
  > > and some tools for deletion.
  > 
  > No doubt.  But that's a specific special case: when you're viewing a
  > diff of changes over which one has easy control (e.g., vc-diff of the
  > working tree).
  > 
  > I can see an argument for turning on highlighting of "introduced
  > trailing whitespace" (not in the context lines) by default for vc-diff
  > of the working tree, but more general ("pedantic") highlighting
  > shouldn't be on by default.

The feature we are talking about here is exclusively about highlighting
the "introduced trailing whitespace"...