bug when diffing

Hi,

Just spent the last four hours trying to find the bug in the lib_diff
but failed miserably. So I'm reporting the issue here hoping someone
else is more familiar with that part of the code.

How to reproduce the problem:

* get the attached zip file
* extract file1.txt and file2.txt
  (the files are identical but the first line)

$ svnadmin create repo
$ svn co file://repo/ wc
$ cd wc
$ mv file1.txt wc/file1.txt
$ svn add file1.txt
$ svn ci -m ""
$ mv -f file2.txt file1.txt
$ svn diff file1.txt
.. one line different shown

But:
$ svn diff file1.txt -x --ignore-eol-style

shows a line diff on every 128kByte mark in the file!

I first thought the shown diffs were random, but they're in fact
*exactly* at 128k boundaries.

This happens with a trunk build from yesterday as well as with an 1.5.4
client.

Stefan

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