--diff-cmd doesn't use -u per default

Hi,

I noticed that I had to rewrite my little vimdiff wrapper for svn diff
again for 1.5.x. In the past -u was provided as first argument, now it
isn't.

$ svn help diff
  --diff-cmd ARG : use ARG as diff command
  -x [--extensions] ARG : Default: '-u'. When Subversion is invoking an
                             external diff program, ARG is simply passed along
                             to the program. But when Subversion is using its
                             default internal diff implementation, or when
                             Subversion is displaying blame annotations, ARG
                             could be any of the following:
                                -u (--unified):
                                   Output 3 lines of unified context.

$ svn diff --diff-cmd diff
Index: subversion/po/de.po
===================================================================
9432d9431
< # CHECKME: " :"?
9440c9439
< "A)bbrechen, Weitermac)hen, E)ditieren :\n"

---
> "A)bbrechen, Weitermac)hen, E)ditieren:\n"
Is this output style intented? If yes, it should maybe also mentioned in the svnbook.
Jens
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