svn diff bug

I'm seeing an inaccurate diff chunk in "svn diff" output. To reproduce this:

svn checkout http://libslax.googlecode.com/svn/trunk/ libslax-read-only
cd libslax-read-only/
svn diff -c342 doc/oxtradoc/rfc2629-to-html.slax

The output I see is:

Index: doc/oxtradoc/rfc2629-to-html.slax
===================================================================
--- doc/oxtradoc/rfc2629-to-html.slax (revision 341)
+++ doc/oxtradoc/rfc2629-to-html.slax (revision 342)
@@ -2696,6 +2696,7 @@
   vertical-align: top;
 }
 table.full {
+ border-style: outset;
   border-style: outset;
   border-width: 1px;
   background-color: lightyellow;

But this is not accurate:

% grep -A3 'table.full {' doc/oxtradoc/rfc2629-to-html.slax
table.full {
  border-style: outset;
  border-width: 1px;
  margin-left: 3em;

The "margin-left" line is the line I added during this commit.

I am running macosx (10.8.0) and svn version 1.7.6 (r1370777).

FWIW, I do _not_ see this issue on freebsd w/ svn version 1.6.6 (r40053).

Is this a known bug? If not, where should I file it?

Thanks,
 Phil

---
Bock [trash/libslax-read-only]% uname -a
Darwin bock.juniper.net 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386
Bock [trash/libslax-read-only]% svn --version
svn, version 1.7.6 (r1370777)
   compiled Aug 24 2012, 12:50:58