Two space indentation displays incorrectly in diff

[Chess Griffin]

Hello,

I am working on some more doc diffs to submit and I am paying careful
attention to the FDP Primer.  The problem is that when I insert a 
two space indent after the first line of a <para>, it shows up as 1
space when I create the diff -u.

This is in my .vimrc:

autocmd BufNewFile,BufRead *.sgml,*.ent,*.html,*.tex,*.xsl set
autoindent formatoptions=tcq2l textwidth=70 shiftwidth=2
softtabstop=2 tabstop=8

When I edit the sgml, it looks ok:

    <sect2 id="consoles-vidcontrol">
      <title>Changing Console Video Modes</title>

      <para>The FreeBSD console default video mode may be adjusted to
        1024x768, 1280x1024, or any other size supported by your 
        graphics chip and monitor.  To use a different video mode, you
        must first recompile your kernel and include two additional
        options:</para>

But in the diff it looks like this:

+    <sect2 id="consoles-vidcontrol">
+      <title>Changing Console Video Modes</title>
+
+      <para>The FreeBSD console default video mode may be adjusted to
+       1024x768, 1280x1024, or any other size supported by your
+       graphics chip and monitor.  To use a different video mode, you
+       must first recompile your kernel and include two additional
+       options:</para>

It appears that there is only a one space indent after the first <para>
line.

I also did ":set list" on the diff and it looks like this:

+    <sect2 id="consoles-vidcontrol">$
+      <title>Changing Console Video Modes</title>$
+$
+      <para>The FreeBSD console default video mode may be adjusted to$
+^I1024x768, 1280x1024, or any other size supported by your$
+^Igraphics chip and monitor.  To use a different video mode, you$
+^Imust first recompile your kernel and include two additional$
+^Ioptions:</para>$

I am stumped as to why this occurs or how to fix it.  

When the diff is applied to the original source, it comes
out fine, so maybe it's ok?

Any advice from expert vimmers would be greatly appreciated.

Thank you.
Chess

-- 
Chess Griffin
GPG Public Key:  0x0C7558C3
http://www.chessgriffin.com
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